下面的简单示例程序演示了关系运算符。复制并粘贴到Test.java的文件中的以下Java程序编译并运行这个程序：

public class Test {

  public static void main(String args[]) {
     int a = 10;
     int b = 20;
     System.out.println("a == b = " + (a == b) );
     System.out.println("a != b = " + (a != b) );
     System.out.println("a > b = " + (a > b) );
     System.out.println("a < b = " + (a < b) );
     System.out.println("b >= a = " + (b >= a) );
     System.out.println("b <= a = " + (b <= a) );
  }
} 

这将产生以下结果:

a == b = false
a != b = true
a > b = false
a < b = true
b >= a = true
b <= a = false