Java while Loop:
| We can use the Eclipse IDE for this example. If you do not know about it then follow this link- How to Install Eclipse For Java and create a program in it. |
A while loop keeps executing the statement in its body (which may be a compound statement, with a number of single statements inside curly braces) while a particular condition evaluates to true. Note that if the condition is not true, the body of the loop is not even executed once.
Syntax of Java while Loop:
| while (condition) { statements; } |
The do-while loop is just like a while loop, except that the test condition is evaluated at the end of the loop, not at the beginning.
Syntax of Java do-while Loop:
| do { statements; } while (condition); |
Example 1:
public class While_loop {
public static void main(String[] args) {
// TODO Auto-generated method stub
int x = 5;
while (x < 12)
{
System.out.println("x = "+ x);
x++;
}
}
}Example 2:
public class While_loop {
public static void main(String[] args) {
// TODO Auto-generated method stub
int x = 5;
while (true)
{
if (x == 12)
{
break;
}
System.out.println("x = "+ x);
x++;
}
System.out.println("End Program.....");
}
}Example 3:
package com.java_tutorial;
public class While_loop {
public static void main(String[] args) {
// TODO Auto-generated method stub
int x = 5;
do
{
System.out.println("x = "+ x);
x++;
}
while (x < 12);
}
}
Example 4:
import java.util.Scanner;
public class While_loop {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scanner = new Scanner(System.in);
int x;
System.out.println("Enter 5 to Exit");
do {
System.out.println("Enter any Integer Value: ");
x = scanner.nextInt();
System.out.println("You have Entered: " + x);
} while (x != 5);
}
}Note: The break statement is to be used only in loops and switch statements. When this statement is executed, the control is taken out of the loop. The loop becomes dead.
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