====== extends ======
''extends'' extends an already existing class with custom methods

<code java>
package myclass.mydate;

import java.util.Date;

/* 
 * extends Date = extends class java.util.Date 
 * java.util.Date must be importet 
 */
public class MyDate extends Date { 

    public int getFullYear() {
        
        return this.getYear() + 1900;
    }
    

    
// overrride the method getMonth from java.util.Date

    @Override
    public int getMonth() {
        return 99;
    }    
}

</code>


==== usage of the extended class ====
<code java>

package xmascalc;


import myclasses.mydate.MyDate; // import the class MyDate




public class XmasCalc{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
    
                
        MyDate my = new MyDate();
        int year = my.getFullYear();
        System.out.println(year);


        int month = my.getMonth();
        System.out.println(month);

    }
}


</code>


=== output ===
    2013
    99