class checkjavainstall
              {
              public static void main(String args[])
              {
              String javaVersion = System.getProperty("java.version");
              if(javaVersion != null)
              {
              System.out.println(" ");
              System.out.println("Java is installed, version : " + javaVersion);
              }
              else{
              System.out.println("Java is not installed on your computer !!");
              }
              }
              }