How do I use the if-then statement?

The if-then is the most basic control flow statement. It will execute the block of statement only if the test expression evaluated equals to true. Let’s see the example below:

package org.kodejava.basic;

public class IfThenDemo {
    public static void main(String[] args) {
        int a = 10;
        int b = 5;

        // If the evaluation of a > b is true, the if block will be
        // executed. In the block below we just print that the value
        // of "a" is bigger than "b".
        if (a > b) {
            System.out.printf("A(%d) is bigger than B(%d)%n", a, b);

        // When we have only a single command inside a block we can
        // remove the opening and closing braces for the block ({..}).
        // But it is a good practice to always enclose the block with
        // braces, so that we know the block of code to be executed.
        if (b < a)
            System.out.printf("B(%d) is smaller that A(%d)%n", b, a);

The result of the above program is:

A(10) is bigger than B(5)
B(5) is smaller that A(10)

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