how to start a java program

1 class A {
2 public static void main(String args[]){
3     System.out.println("Hello World");
4 }
5}

1javac MyFisrtProgam.java // enter to compile 
2  java MyfirstProgram // run program 
3

1// Assuming that you have an executable jar
2java -jar myJavaProject.jar
3
4// Assuming that you have packaged jar
5java -jar target/myJavaProject.jar