Question

How to use while statement in Java

Answer 1

public class Example {
    public static void main(String[] args) {
             
        int i = 1;
        while (i <= 10) {
            System.out.println(i);
            i++;
        }
    }
}
 
 
 
/*
run:
  
1
2
3
4
5
6
7
8
9
10
  
*/

 

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Answer 2

public class Example {
    public static void main(String[] args) {
             
        int i = 10;
        while (i > 0) {
            System.out.println(i);
            i--;
        }
    }
}
 
 
 
/*
run:
  
10
9
8
7
6
5
4
3
2
1
  
*/

 

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Answer 3

package javaapplication1;
 
public class Example {
    public static void main(String[] args) {
             
        int i = 0;
        while (i < 10) {
            System.out.println(i + 1);
            i++;
        }
    }
}


/*
run:
 
1
2
3
4
5
6
7
8
9
10
 
*/

 

70+ SQL courses for beginners and professionals

Answer 4

package javaapplication1;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            int i = 0;
            int j = 10;

            while (i < j) {
                i++;
                j--;

                System.out.println(i + " - " + j);
            }

        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}

/*
             
run:

1 - 9
2 - 8
3 - 7
4 - 6
5 - 5
    
 */

 

70+ SQL courses for beginners and professionals

Answer 5

package javaapplication1;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            while (true) {

                // random number between 0 and 1
                double d = Math.random();
                
                System.out.println(d);

                if (d >= 0.9) {
                    break;
                }
            }

        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}

/*
             
run:

0.03887417958355743
0.9211588303344862
    
 */

 

70+ SQL courses for beginners and professionals

Answer 6

package javaapplication1;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            int i = -3;
            while (i < 5) {
                System.out.println(i);
                i++;
            }

        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}

/*
             
run:

-3
-2
-1
0
1
2
3
4
    
 */

 

70+ SQL courses for beginners and professionals

Answer 7

package javaapplication1;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            int i = 1;
            while (i++ < 5) {
                System.out.println(i);
            }

        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}

/*
             
run:

2
3
4
5
    
 */

 

70+ SQL courses for beginners and professionals

Answer 8

package javaapplication1;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            int i = 1;
            while (++i < 5) {
                System.out.println(i);
            }

        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}

/*
             
run:

2
3
4
    
 */

 

70+ SQL courses for beginners and professionals