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How to 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 com.javacoderanch.example.lang;

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

        //
        // If the evaluation of a > b is true than the if block is
        // executed. In the block below we just print that the value
        // of a is bigger than b.
        //
        if (a > b) {
            System.out.println("A(" + a + ") is bigger than B(" + 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.
        //
        if (b < a) 
            System.out.println("B(" + b + ") is smaller that A(" + a + ")");
    }
}

The result of the above program is:

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