Mixing
Do While Loops Versus For Loops in Java for Counting
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up vote
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favorite
Ok so this is a question that has probably been asked a thousand times, but none of them that I found really had an answer that I was particularly looking for. I have done much research on this topic but to no avail. My question is: When it comes to counting, should a do-while loop be used, or a for loop? Because this:
class Main
public static void main(String args)
int times = 1;
do
System.out.println("I have printed " + times + " times.");
times++;
while (times < 6);
Seems to do the exact same thing as this:
class Main
public static void main(String args)
for (int times = 0; times < 6; times++)
System.out.println("I have printed " + times + " times.");
Is it a difference in speed? Preference? Situation? Personal quirks? Some kind of "Java social taboo"? I have no idea. Either seem to be able to be used for effective counting, just that one takes a lot more. And both print the exact same thing.
Sorry if this question isn't written very well, this is the first question I have asked on this site.
Thanks!!
java for-loop do-while counting
asked 3 hours ago
Domani Tomlindo
313
New contributor
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
6
down vote
favorite
Ok so this is a question that has probably been asked a thousand times, but none of them that I found really had an answer that I was particularly looking for. I have done much research on this topic but to no avail. My question is: When it comes to counting, should a do-while loop be used, or a for loop? Because this:
class Main
public static void main(String args)
int times = 1;
do
System.out.println("I have printed " + times + " times.");
times++;
while (times < 6);
Seems to do the exact same thing as this:
class Main
public static void main(String args)
for (int times = 0; times < 6; times++)
System.out.println("I have printed " + times + " times.");
Is it a difference in speed? Preference? Situation? Personal quirks? Some kind of "Java social taboo"? I have no idea. Either seem to be able to be used for effective counting, just that one takes a lot more. And both print the exact same thing.
Sorry if this question isn't written very well, this is the first question I have asked on this site.
Thanks!!
java for-loop do-while counting
asked 3 hours ago
Domani Tomlindo
313
New contributor
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
To an extent, it comes down to taste. I would prefer to use a for loop in this situtation, because the declaration is scoped to the loop, and incrementing is outside the loop body. The main difference between the types of loop, however, is that ado/whileloop executes at least once, whereas afor(or awhile) may not execute.
– Andy Turner
3 hours ago
It doesn't matter. BTW, with Java 8+, you can also doIntStream.rangeClosed(1, 6).forEach(times -> System.out.println("I have printed " + times + " times."));
– David Conrad
3 hours ago
add a comment |Â
up vote
6
down vote
favorite
up vote
6
down vote
favorite
Ok so this is a question that has probably been asked a thousand times, but none of them that I found really had an answer that I was particularly looking for. I have done much research on this topic but to no avail. My question is: When it comes to counting, should a do-while loop be used, or a for loop? Because this:
class Main
public static void main(String args)
int times = 1;
do
System.out.println("I have printed " + times + " times.");
times++;
while (times < 6);
Seems to do the exact same thing as this:
class Main
public static void main(String args)
for (int times = 0; times < 6; times++)
System.out.println("I have printed " + times + " times.");
Is it a difference in speed? Preference? Situation? Personal quirks? Some kind of "Java social taboo"? I have no idea. Either seem to be able to be used for effective counting, just that one takes a lot more. And both print the exact same thing.
Sorry if this question isn't written very well, this is the first question I have asked on this site.
Thanks!!
java for-loop do-while counting
asked 3 hours ago
Domani Tomlindo
313
New contributor
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ok so this is a question that has probably been asked a thousand times, but none of them that I found really had an answer that I was particularly looking for. I have done much research on this topic but to no avail. My question is: When it comes to counting, should a do-while loop be used, or a for loop? Because this:
class Main
public static void main(String args)
int times = 1;
do
System.out.println("I have printed " + times + " times.");
times++;
while (times < 6);
Seems to do the exact same thing as this:
class Main
public static void main(String args)
for (int times = 0; times < 6; times++)
System.out.println("I have printed " + times + " times.");
Is it a difference in speed? Preference? Situation? Personal quirks? Some kind of "Java social taboo"? I have no idea. Either seem to be able to be used for effective counting, just that one takes a lot more. And both print the exact same thing.
Sorry if this question isn't written very well, this is the first question I have asked on this site.
Thanks!!
java for-loop do-while counting
java for-loop do-while counting
asked 3 hours ago
Domani Tomlindo
313
New contributor
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
Domani Tomlindo
313
New contributor
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 3 hours ago
asked 3 hours ago
Domani Tomlindo
313
New contributor
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
Domani Tomlindo
313
asked 3 hours ago
Domani Tomlindo
313
313
New contributor
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Domani Tomlindo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
To an extent, it comes down to taste. I would prefer to use a for loop in this situtation, because the declaration is scoped to the loop, and incrementing is outside the loop body. The main difference between the types of loop, however, is that ado/whileloop executes at least once, whereas afor(or awhile) may not execute.
– Andy Turner
3 hours ago
It doesn't matter. BTW, with Java 8+, you can also doIntStream.rangeClosed(1, 6).forEach(times -> System.out.println("I have printed " + times + " times."));
– David Conrad
3 hours ago
add a comment |Â
To an extent, it comes down to taste. I would prefer to use a for loop in this situtation, because the declaration is scoped to the loop, and incrementing is outside the loop body. The main difference between the types of loop, however, is that ado/whileloop executes at least once, whereas afor(or awhile) may not execute.
– Andy Turner
3 hours ago
It doesn't matter. BTW, with Java 8+, you can also doIntStream.rangeClosed(1, 6).forEach(times -> System.out.println("I have printed " + times + " times."));
– David Conrad
3 hours ago
To an extent, it comes down to taste. I would prefer to use a for loop in this situtation, because the declaration is scoped to the loop, and incrementing is outside the loop body. The main difference between the types of loop, however, is that a
do/while loop executes at least once, whereas a for (or a while) may not execute.– Andy Turner
3 hours ago
To an extent, it comes down to taste. I would prefer to use a for loop in this situtation, because the declaration is scoped to the loop, and incrementing is outside the loop body. The main difference between the types of loop, however, is that a
do/while loop executes at least once, whereas a for (or a while) may not execute.– Andy Turner
3 hours ago
It doesn't matter. BTW, with Java 8+, you can also do
IntStream.rangeClosed(1, 6).forEach(times -> System.out.println("I have printed " + times + " times."));– David Conrad
3 hours ago
It doesn't matter. BTW, with Java 8+, you can also do
IntStream.rangeClosed(1, 6).forEach(times -> System.out.println("I have printed " + times + " times."));– David Conrad
3 hours ago
add a comment |Â
5 Answers
5
active
oldest
votes
up vote
5
down vote
You're right, these do exactly the same thing. If you know in advance (before the loop starts) how many times you want it to iterate, most Java developers will tell you to go with a for loop. That's what it's designed for.
A while loop or do while loop is better suited for situations where you're looking for a specific value or condition before you exit the loop.
answered 3 hours ago
Bill the Lizard
284k156490786
True, I forgot about the fact that, (from personal experiences), nothing executes after thedo-whileloop, and would just have to keep nesting loops.
– Domani Tomlindo
3 hours ago
add a comment |Â
up vote
2
down vote
When faced with these kind of dilemmas, aim for readability and familiarity. You should not concern yourself with micro-optimizations. Focus on readability and clearly conveying you intent. Do as other do in similar situation.
Like @Bill-The-Lizard said, while loop suggests to the reader of your code that you opted for it, because you're not counting, but repeating until a condition is met. At least once - otherwise you'd have chosen while(...) loop.
In other words, for, do while() and while() generally work the same. But one may better convey you intent in your particular piece of logic.
answered 3 hours ago
rzymek
6,55223043
add a comment |Â
up vote
0
down vote
I think it's more of a readability and syntactic sugar. This while condition
while (condition)
can also be written as
for (; condition; )
but obviously the first one looks lot better and is more readable.
answered 3 hours ago
stackFan
580618
OP is asking about a do/while loop, not a while loop.
– Andy Turner
3 hours ago
add a comment |Â
up vote
0
down vote
It depends on the programmer's choice when to use for loop or do while loop but the general practice followed by most of the programmers is
- For loop
When you know that the loop will execute a predefined number of times(general practice since you can also usefor(;true;)which loops forever).
For example a loop which runs 10 times or n number of times where n is a variable
for(int i = 0; i < n; i++)
//Do something
- While loop
When you know that the loop should terminate after the evaluation of a specific condition as true or else you want the loop to run forever (like while(true)) and check the break conditions inside the while loop.
Also the while loop is preferred when you can't figure out the conditions in the first place and start with while(true) but once you write code inside the loop you get good understanding of what's happening and get the idea about which conditions to check thus when to exit the loop.
For example
while(x != 0)
//Do something;
x--;
while(true)
// some code to execute on which the condition depends
if(condition is true)
break;
- Do while loop
Do while loop is similar to the while loop but with a small difference. That is it allows the first iteration to happen without checking the condition(specified in the while statement, but you can still evaluate the condition inside the block(curly braces)).
answered 3 hours ago
geektl
214
New contributor
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
0
down vote
By convention most Java developers use for loops. Effective Java recommends for loops instead of while loops because the loop variable can use a tighter scope which reduces bugs. http://www.corejavaguru.com/effective-java/items/45
answered 3 hours ago
neildo
98767
add a comment |Â
5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
5
down vote
You're right, these do exactly the same thing. If you know in advance (before the loop starts) how many times you want it to iterate, most Java developers will tell you to go with a for loop. That's what it's designed for.
A while loop or do while loop is better suited for situations where you're looking for a specific value or condition before you exit the loop.
answered 3 hours ago
Bill the Lizard
284k156490786
True, I forgot about the fact that, (from personal experiences), nothing executes after thedo-whileloop, and would just have to keep nesting loops.
– Domani Tomlindo
3 hours ago
add a comment |Â
up vote
5
down vote
You're right, these do exactly the same thing. If you know in advance (before the loop starts) how many times you want it to iterate, most Java developers will tell you to go with a for loop. That's what it's designed for.
A while loop or do while loop is better suited for situations where you're looking for a specific value or condition before you exit the loop.
answered 3 hours ago
Bill the Lizard
284k156490786
True, I forgot about the fact that, (from personal experiences), nothing executes after thedo-whileloop, and would just have to keep nesting loops.
– Domani Tomlindo
3 hours ago
add a comment |Â
up vote
5
down vote
up vote
5
down vote
You're right, these do exactly the same thing. If you know in advance (before the loop starts) how many times you want it to iterate, most Java developers will tell you to go with a for loop. That's what it's designed for.
A while loop or do while loop is better suited for situations where you're looking for a specific value or condition before you exit the loop.
answered 3 hours ago
Bill the Lizard
284k156490786
You're right, these do exactly the same thing. If you know in advance (before the loop starts) how many times you want it to iterate, most Java developers will tell you to go with a for loop. That's what it's designed for.
A while loop or do while loop is better suited for situations where you're looking for a specific value or condition before you exit the loop.
answered 3 hours ago
Bill the Lizard
284k156490786
answered 3 hours ago
Bill the Lizard
284k156490786
answered 3 hours ago
Bill the Lizard
284k156490786
answered 3 hours ago
Bill the Lizard
284k156490786
284k156490786
True, I forgot about the fact that, (from personal experiences), nothing executes after thedo-whileloop, and would just have to keep nesting loops.
– Domani Tomlindo
3 hours ago
add a comment |Â
True, I forgot about the fact that, (from personal experiences), nothing executes after thedo-whileloop, and would just have to keep nesting loops.
– Domani Tomlindo
3 hours ago
True, I forgot about the fact that, (from personal experiences), nothing executes after the
do-while loop, and would just have to keep nesting loops.– Domani Tomlindo
3 hours ago
True, I forgot about the fact that, (from personal experiences), nothing executes after the
do-while loop, and would just have to keep nesting loops.– Domani Tomlindo
3 hours ago
add a comment |Â
up vote
2
down vote
When faced with these kind of dilemmas, aim for readability and familiarity. You should not concern yourself with micro-optimizations. Focus on readability and clearly conveying you intent. Do as other do in similar situation.
Like @Bill-The-Lizard said, while loop suggests to the reader of your code that you opted for it, because you're not counting, but repeating until a condition is met. At least once - otherwise you'd have chosen while(...) loop.
In other words, for, do while() and while() generally work the same. But one may better convey you intent in your particular piece of logic.
answered 3 hours ago
rzymek
6,55223043
add a comment |Â
up vote
2
down vote
When faced with these kind of dilemmas, aim for readability and familiarity. You should not concern yourself with micro-optimizations. Focus on readability and clearly conveying you intent. Do as other do in similar situation.
Like @Bill-The-Lizard said, while loop suggests to the reader of your code that you opted for it, because you're not counting, but repeating until a condition is met. At least once - otherwise you'd have chosen while(...) loop.
In other words, for, do while() and while() generally work the same. But one may better convey you intent in your particular piece of logic.
answered 3 hours ago
rzymek
6,55223043
add a comment |Â
up vote
2
down vote
up vote
2
down vote
When faced with these kind of dilemmas, aim for readability and familiarity. You should not concern yourself with micro-optimizations. Focus on readability and clearly conveying you intent. Do as other do in similar situation.
Like @Bill-The-Lizard said, while loop suggests to the reader of your code that you opted for it, because you're not counting, but repeating until a condition is met. At least once - otherwise you'd have chosen while(...) loop.
In other words, for, do while() and while() generally work the same. But one may better convey you intent in your particular piece of logic.
answered 3 hours ago
rzymek
6,55223043
When faced with these kind of dilemmas, aim for readability and familiarity. You should not concern yourself with micro-optimizations. Focus on readability and clearly conveying you intent. Do as other do in similar situation.
Like @Bill-The-Lizard said, while loop suggests to the reader of your code that you opted for it, because you're not counting, but repeating until a condition is met. At least once - otherwise you'd have chosen while(...) loop.
In other words, for, do while() and while() generally work the same. But one may better convey you intent in your particular piece of logic.
answered 3 hours ago
rzymek
6,55223043
answered 3 hours ago
rzymek
6,55223043
answered 3 hours ago
rzymek
6,55223043
answered 3 hours ago
rzymek
6,55223043
6,55223043
add a comment |Â
add a comment |Â
up vote
0
down vote
I think it's more of a readability and syntactic sugar. This while condition
while (condition)
can also be written as
for (; condition; )
but obviously the first one looks lot better and is more readable.
answered 3 hours ago
stackFan
580618
OP is asking about a do/while loop, not a while loop.
– Andy Turner
3 hours ago
add a comment |Â
up vote
0
down vote
I think it's more of a readability and syntactic sugar. This while condition
while (condition)
can also be written as
for (; condition; )
but obviously the first one looks lot better and is more readable.
answered 3 hours ago
stackFan
580618
OP is asking about a do/while loop, not a while loop.
– Andy Turner
3 hours ago
add a comment |Â
up vote
0
down vote
up vote
0
down vote
I think it's more of a readability and syntactic sugar. This while condition
while (condition)
can also be written as
for (; condition; )
but obviously the first one looks lot better and is more readable.
answered 3 hours ago
stackFan
580618
I think it's more of a readability and syntactic sugar. This while condition
while (condition)
can also be written as
for (; condition; )
but obviously the first one looks lot better and is more readable.
answered 3 hours ago
stackFan
580618
answered 3 hours ago
stackFan
580618
answered 3 hours ago
stackFan
580618
answered 3 hours ago
stackFan
580618
580618
OP is asking about a do/while loop, not a while loop.
– Andy Turner
3 hours ago
add a comment |Â
OP is asking about a do/while loop, not a while loop.
– Andy Turner
3 hours ago
OP is asking about a do/while loop, not a while loop.
– Andy Turner
3 hours ago
OP is asking about a do/while loop, not a while loop.
– Andy Turner
3 hours ago
add a comment |Â
up vote
0
down vote
It depends on the programmer's choice when to use for loop or do while loop but the general practice followed by most of the programmers is
- For loop
When you know that the loop will execute a predefined number of times(general practice since you can also usefor(;true;)which loops forever).
For example a loop which runs 10 times or n number of times where n is a variable
for(int i = 0; i < n; i++)
//Do something
- While loop
When you know that the loop should terminate after the evaluation of a specific condition as true or else you want the loop to run forever (like while(true)) and check the break conditions inside the while loop.
Also the while loop is preferred when you can't figure out the conditions in the first place and start with while(true) but once you write code inside the loop you get good understanding of what's happening and get the idea about which conditions to check thus when to exit the loop.
For example
while(x != 0)
//Do something;
x--;
while(true)
// some code to execute on which the condition depends
if(condition is true)
break;
- Do while loop
Do while loop is similar to the while loop but with a small difference. That is it allows the first iteration to happen without checking the condition(specified in the while statement, but you can still evaluate the condition inside the block(curly braces)).
answered 3 hours ago
geektl
214
New contributor
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
0
down vote
It depends on the programmer's choice when to use for loop or do while loop but the general practice followed by most of the programmers is
- For loop
When you know that the loop will execute a predefined number of times(general practice since you can also usefor(;true;)which loops forever).
For example a loop which runs 10 times or n number of times where n is a variable
for(int i = 0; i < n; i++)
//Do something
- While loop
When you know that the loop should terminate after the evaluation of a specific condition as true or else you want the loop to run forever (like while(true)) and check the break conditions inside the while loop.
Also the while loop is preferred when you can't figure out the conditions in the first place and start with while(true) but once you write code inside the loop you get good understanding of what's happening and get the idea about which conditions to check thus when to exit the loop.
For example
while(x != 0)
//Do something;
x--;
while(true)
// some code to execute on which the condition depends
if(condition is true)
break;
- Do while loop
Do while loop is similar to the while loop but with a small difference. That is it allows the first iteration to happen without checking the condition(specified in the while statement, but you can still evaluate the condition inside the block(curly braces)).
answered 3 hours ago
geektl
214
New contributor
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
0
down vote
up vote
0
down vote
It depends on the programmer's choice when to use for loop or do while loop but the general practice followed by most of the programmers is
- For loop
When you know that the loop will execute a predefined number of times(general practice since you can also usefor(;true;)which loops forever).
For example a loop which runs 10 times or n number of times where n is a variable
for(int i = 0; i < n; i++)
//Do something
- While loop
When you know that the loop should terminate after the evaluation of a specific condition as true or else you want the loop to run forever (like while(true)) and check the break conditions inside the while loop.
Also the while loop is preferred when you can't figure out the conditions in the first place and start with while(true) but once you write code inside the loop you get good understanding of what's happening and get the idea about which conditions to check thus when to exit the loop.
For example
while(x != 0)
//Do something;
x--;
while(true)
// some code to execute on which the condition depends
if(condition is true)
break;
- Do while loop
Do while loop is similar to the while loop but with a small difference. That is it allows the first iteration to happen without checking the condition(specified in the while statement, but you can still evaluate the condition inside the block(curly braces)).
answered 3 hours ago
geektl
214
New contributor
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
It depends on the programmer's choice when to use for loop or do while loop but the general practice followed by most of the programmers is
- For loop
When you know that the loop will execute a predefined number of times(general practice since you can also usefor(;true;)which loops forever).
For example a loop which runs 10 times or n number of times where n is a variable
for(int i = 0; i < n; i++)
//Do something
- While loop
When you know that the loop should terminate after the evaluation of a specific condition as true or else you want the loop to run forever (like while(true)) and check the break conditions inside the while loop.
Also the while loop is preferred when you can't figure out the conditions in the first place and start with while(true) but once you write code inside the loop you get good understanding of what's happening and get the idea about which conditions to check thus when to exit the loop.
For example
while(x != 0)
//Do something;
x--;
while(true)
// some code to execute on which the condition depends
if(condition is true)
break;
- Do while loop
Do while loop is similar to the while loop but with a small difference. That is it allows the first iteration to happen without checking the condition(specified in the while statement, but you can still evaluate the condition inside the block(curly braces)).
answered 3 hours ago
geektl
214
New contributor
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 3 hours ago
answered 3 hours ago
geektl
214
New contributor
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 3 hours ago
geektl
214
answered 3 hours ago
geektl
214
214
New contributor
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
geektl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
add a comment |Â
up vote
0
down vote
By convention most Java developers use for loops. Effective Java recommends for loops instead of while loops because the loop variable can use a tighter scope which reduces bugs. http://www.corejavaguru.com/effective-java/items/45
answered 3 hours ago
neildo
98767
add a comment |Â
up vote
0
down vote
By convention most Java developers use for loops. Effective Java recommends for loops instead of while loops because the loop variable can use a tighter scope which reduces bugs. http://www.corejavaguru.com/effective-java/items/45
answered 3 hours ago
neildo
98767
add a comment |Â
up vote
0
down vote
up vote
0
down vote
By convention most Java developers use for loops. Effective Java recommends for loops instead of while loops because the loop variable can use a tighter scope which reduces bugs. http://www.corejavaguru.com/effective-java/items/45
answered 3 hours ago
neildo
98767
By convention most Java developers use for loops. Effective Java recommends for loops instead of while loops because the loop variable can use a tighter scope which reduces bugs. http://www.corejavaguru.com/effective-java/items/45
answered 3 hours ago
neildo
98767
answered 3 hours ago
neildo
98767
answered 3 hours ago
neildo
98767
answered 3 hours ago
neildo
98767
98767
add a comment |Â
add a comment |Â
Domani Tomlindo is a new contributor. Be nice, and check out our Code of Conduct.
Domani Tomlindo is a new contributor. Be nice, and check out our Code of Conduct.
Domani Tomlindo is a new contributor. Be nice, and check out our Code of Conduct.
Domani Tomlindo is a new contributor. Be nice, and check out our Code of Conduct.
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To an extent, it comes down to taste. I would prefer to use a for loop in this situtation, because the declaration is scoped to the loop, and incrementing is outside the loop body. The main difference between the types of loop, however, is that a
do/whileloop executes at least once, whereas afor(or awhile) may not execute.– Andy Turner
3 hours ago
It doesn't matter. BTW, with Java 8+, you can also do
IntStream.rangeClosed(1, 6).forEach(times -> System.out.println("I have printed " + times + " times."));– David Conrad
3 hours ago