Estensioni Metodi Classi java

3 File
Main.java
A.java
B.java

Main.java

package a;

/**
 *
 * @author dellxps
 */
public class Main {
   
     public static void main(String[] args) {
      
      try 
            {
         A a=new A();
         a.print();
        
         B b=new B();
         b.print();
            }
   catch (Exception e)  
        { 
        }
}
}

A.java
public class A {
   
    public void print() {
       String[] data = { "\u250C\u2500\u2500\u2500\u2500\u2500\u2510",
        "\u2502Hello\u2502",
        "\u2514\u2500\u2500\u2500\u2500\u2500\u2518" };
        try 
            {

    for (String s : data) {
      System.out.println(s);
    }
    for (String s : data) {
      System.console().writer().println(s);
    }
    }
    catch (Exception e)  
        { 
        }
   }
  
}

B.java
/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
// http://stackoverflow.com/questions/4188091/java-extends-example

package a ;
/**
 *
 * @author dellxps
 */
public class B extends A {
  private String out2 = "child";
  @Override
  public void print(){

     System.out.println(out2);
}
}

Output run:
┌─────┐
│Hello     │
└─────┘
child

BUILD SUCCESSFUL (total time: 0 seconds)