Write a Java program to check whether Java is installed on your computer?

Source Code:

public class TestProgram {
 public static void main(String[] args) {
  System.out.println("\nJava Version: " + System.getProperty("java.version"));
  System.out.println("Java Runtime Version: " + System.getProperty("java.runtime.version"));
  System.out.println("Java Home: " + System.getProperty("java.home"));
  System.out.println("Java Vendor: " + System.getProperty("java.vendor"));
  System.out.println("Java Vendor URL: " + System.getProperty("java.vendor.url"));
  System.out.println("Java Class Path: " + System.getProperty("java.class.path") + "\n");
 }
}

Output:

Java Version: 1.8.0_71                                                                                        
Java Runtime Version: 1.8.0_71-b15                                                                            
Java Home: /opt/jdk/jdk1.8.0_71/jre                                                                           
Java Vendor: Oracle Corporation                                                                               
Java Vendor URL: http://java.oracle.com/                                                                      
Java Class Path: .