do while Loop:

//A do-while loop is similar to a while loop, except that a do...while loop is guaranteed to execute at least one time.
//Syntax
The syntax of a do ...
    while loop is:
    do {
        //Statements
    } while (Boolean_expression);

Notice that the Boolean expression appears at the end of the loop, so the statements in the loop execute once before the Boolean is tested.
If the Boolean expression is true, the flow of control jumps back up to do, and the statements in the loop execute again. This process repeats until the Boolean expression is false.

Example

public class Test {
    public static void main(String args[]) {
        int x = 10;
        do {
            System.out.print("value of x : " + x);
            x++;
            System.out.print("\n");
        } while (x < 20);
    }
}

Output
value of x : 10
value of x : 11
value of x : 12
value of x : 13
value of x : 14
value of x : 15
value of x : 16
value of x : 17
value of x : 18
value of x : 19 

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