W3School TIY Editor

public class Main {

  String fname = "Bill";

  String lname = "Gates";

  int age = 24;

​

  public static void main(String[] args) {

    Main myObj = new Main();

    System.out.println("姓名: " + myObj.fname + " " + myObj.lname);

    System.out.println("年龄: " + myObj.age);

  }

}