This question already has answers here:
How do I break multiple foreach loops? [duplicate]
(9 answers)
How do I break out of nested loops in Java?
(37 answers)
Closed 5 years ago.
Does the keyword 'break' only jump out of one layer of loop? In this piece of code, there are 3 layers loops, which I want to jump out completely. Is there an easy to do that?
while(){
while(){
for(){
if(a==b){
// I want to jump out of the outer while() loop.
}
}
}
}
// and the logic continues from this line.
Related
This question already has answers here:
Please explain the usage of Labeled Statements
(3 answers)
Java Label usage [duplicate]
(2 answers)
"loop:" in Java code. What is this, and why does it compile?
(12 answers)
Should I avoid using Java Label Statements?
(12 answers)
Closed 4 years ago.
I've read some tutorials which using this syntax in Java, but I don't know what it's mean?
newNumber:while (1 <= 500) {
// do something
}
I don't understand what newNumber:while mean and I can't find it on oracle documentation.
newValue is label here. You can use it with break and continue statement. It becomes relevant for nesting loops when you want to jump from inside the nested loop.
This question already has answers here:
How does the Java 'for each' loop work?
(29 answers)
Closed 5 years ago.
How this for loop statement works? Can we only use it to print arrays?
for (Integer i : arrayToSort){
System.out.println(i.intValue());
}
This is the for-each loop, you can use it like the normal for-loop. Only the syntax is different. Please look at the https://docs.oracle.com/javase/8/docs/technotes/guides/language/foreach.html
This question already has answers here:
How does a for loop work, specifically for(;;)?
(6 answers)
Closed 7 years ago.
There are a lots of option available for infinite loop but this are mostly use while(true) or for(;;)
I know while(true) is the best option, since it is easier to understand.
But I want to use for(;;).
I want to know what is going on inside of for loop when I we used two ; within for loop.
for(;;)
Semicolon means its an empty statement. But how its works when we use inside of for loop for infinite execution?
This is what happens:
for (initialization statement; condition check; increment/decrement)
// loop body;
With for(;;):
There is no initialization.
There is no condition check.
There is no increment/decrement.
Therefore it will run forever, exactly like while(true).
This question already has answers here:
Java loop efficiency ("for" vs. "foreach") [duplicate]
(5 answers)
Closed 8 years ago.
What is very faster, normal {for loop} or {foreach loop} in java ?
They are different first of all. for-each uses Iterator under the hood whereas for is useful for operations on arrays or where you can do something meaningful with indexes.
This question already has answers here:
Java: If vs. Switch
(11 answers)
Closed 9 years ago.
I'm mostly just curious, is using if/else and a switch statement just a matter of personal preference, or do they actually work differently? Is one more efficient than the other? If they are, why exactly?
if your case more than four, switch-case statement is more effiecient. your case directly jumped. on the other hand if you use if-else statement all cases compared until your cases is crossed.