How to break out of nested loops in Java?

In this post, I am going to explain how to break the outer loop in Java.

 

Approach 1: Using labelled break statement.

 

labelled break

label is a group of statements, identified by using labelname.

 

Syntax

labelName: {
      statement 1
      statement 2
      …....
      statement N
    }

 

Syntax to break the label

break labelName;

 

BreakOuterLoopDemo1.java

package com.sample.app.loops;

public class BreakOuterLoopDemo1 {

	public static void main(String[] args) {
		outerLoop: 
			for (int i = 1; i < 10; i++) {
				for (int j = 1; j < 10; j++) {
					if (i * j > 5) {
						System.out.println("Breaking outer loop");
						break outerLoop;
					} else {
						System.out.println("(" + i + "," + j + ")");
					}
				}
				System.out.println("Inner loop executed....");
			}
	}

}

 

Output

(1,1)
(1,2)
(1,3)
(1,4)
(1,5)
Breaking outer loop

 

Approach 2: Keep the looping logic in a different method, and return from the method, when you meet the criteria.

 

BreakOuterLoopDemo2.java

package com.sample.app.loops;

public class BreakOuterLoopDemo2 {

	public static void doSomeLogic() {
		for (int i = 1; i < 10; i++) {
			for (int j = 1; j < 10; j++) {
				if (i * j > 5) {
					System.out.println("Breaking outer loop");
					return;
				} else {
					System.out.println("(" + i + "," + j + ")");
				}
			}
			System.out.println("Inner loop executed....");
		}
	}

	public static void main(String[] args) {
		doSomeLogic();
	}

}

 

Output

(1,1)
(1,2)
(1,3)
(1,4)
(1,5)
Breaking outer loop

 

Approach 3: With the help of a Boolean flag.

 

BreakOuterLoopDemo3.java

package com.sample.app.loops;

public class BreakOuterLoopDemo3 {

	public static void main(String[] args) {
		boolean flag = true;

		for (int i = 1; (i < 10 && flag); i++) {
			for (int j = 1; (j < 10 && flag); j++) {
				if (i * j > 5) {
					System.out.println("Breaking outer loop");
					flag = false;
				} else {
					System.out.println("(" + i + "," + j + ")");
				}
			}
			System.out.println("Inner loop executed....");
		}
	}

}

 

Output

(1,1)
(1,2)
(1,3)
(1,4)
(1,5)
Breaking outer loop
Inner loop executed....

 

  

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Php: break statement: exit from the loop

‘break’ statement is used to come out of the loop.

 

Syntax

break;

 

Example 1: Printing numbers from 1 to 5.

for ($i = 0; $i < 10; $i ++) {
    echo "i = $i\n";
    if($i == 5){
        break;
    }
}

 

Example 2: Printing stars in triangle shape.

for($i=0; $i<10; $i++){
    for($j=0; $j<10; $j++){
        if($j > $i){
            break;
        }
        echo"* ";
    }
    echo"\n";
}

break_statement_demo.php

#!/usr/bin/php

<?php
echo "Printing numbers from 0 to 5\n";
for ($i = 0; $i < 10; $i ++) {
    echo "i = $i\n";
    if($i == 5){
        break;
    }
}

echo "\n\nPrinting stars in triangle shape\n";

for($i=0; $i<10; $i++){
    for($j=0; $j<10; $j++){
        if($j > $i){
            break;
        }
        echo"* ";
    }
    echo"\n";
}

?>

Output

$./break_statement_demo.php 

Printing numbers from 0 to 5
i = 0
i = 1
i = 2
i = 3
i = 4
i = 5


Printing stars in triangle shape
* 
* * 
* * * 
* * * * 
* * * * * 
* * * * * * 
* * * * * * * 
* * * * * * * * 
* * * * * * * * * 
* * * * * * * * * *

 

 

 

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