while loop in java
In java, while loop is used to executes same set of statements until condition becomes true.
Syntax of while loop:
while (condition(s)) {
// set of statements
}
Output: It is also called ‘entry controlled loop’ because conditions is checked at the entrance of the loop and it enters the loop only if condition is true.
Condition argument returns boolean value like true or false depending on the condition check. Once condition becomes false, control will jump to the next line of loop after exiting the loop.
public class WhileLoopEx {
public static void main(String[] args) {
int counter = 1;
while (counter < 10) { // print the number till 9
System.out.println("Number : " + counter);
counter++;
}
}
}
Output:
Number : 1
Number : 2
Number : 3
Number : 4
Number : 5
Number : 6
Number : 7
Number : 8
Number : 9
Number : 1
Number : 2
Number : 3
Number : 4
Number : 5
Number : 6
Number : 7
Number : 8
Number : 9
If there is only one line statements, then curly braces are not required in the loop.
public class WhileLoopEx {
public static void main(String[] args) {
int counter = 1;
while (counter < 10) // no need of curly braces
System.out.println("Number : " + counter++);
}
}
Output:
Number : 1
Number : 2
Number : 3
Number : 4
Number : 5
Number : 6
Number : 7
Number : 8
Number : 9
Number : 1
Number : 2
Number : 3
Number : 4
Number : 5
Number : 6
Number : 7
Number : 8
Number : 9
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