How do I exit a while loop in Java?

Question

What is the best way to exit/terminate a while loop in Java?

For example, my code is currently as follows:

while(true){
    if(obj == null){

                


        

Answer 1

if you write while(true). its means that loop will not stop in any situation for stop this loop you have to use break statement between while block.

package com.java.demo;

/**
 * @author Ankit Sood Apr 20, 2017
 */
public class Demo {

    /**
     * The main method.
     *
     * @param args
     *            the arguments
     */
    public static void main(String[] args) {
        /* Initialize while loop */
        while (true) {
            /*
            * You have to declare some condition to stop while loop 

            * In which situation or condition you want to terminate while loop.
            * conditions like: if(condition){break}, if(var==10){break} etc... 
            */

            /* break keyword is for stop while loop */

            break;
        }
    }
}

Answer 2

Use break:

while (true) {
    ....
    if (obj == null) {
        break;
    }
    ....
}

---

However, if your code looks exactly like you have specified you can use a normal while loop and change the condition to obj != null:

while (obj != null) {
    ....
}

Answer 3

You can do multiple condition logical tests within the while() check using the same rules as within any logical check.

while ( obj != null ) {  
    // do stuff  
}

works, as does

while ( value > 5 && value < 10 ) {  
    // do stuff  
}  

are valid. The conditionals are checked on each iteration through the loop. As soon as one doesn't match, the while() loop is exited. You can also use break;

while ( value > 5 ) {  
    if ( value > 10 ) { break; }  
    ...  
}  

Answer 4

break is what you're looking for:

while (true) {
    if (obj == null) break;
}

alternatively, restructure your loop:

while (obj != null) {
    // do stuff
}

or:

do {
    // do stuff
} while (obj != null);

Answer 5

To exit a while loop, use Break; This will not allow to loop to process any conditions that are placed inside, make sure to have this inside the loop, as you cannot place it outside the loop

Answer 6

while(obj != null){
  // statements.
}