Creating Subclasses
It is also possible to subclass a class that has been imported from another package. This is illustrated by following program. Note that the Data class inside the mypack package.
Program
package mypack; public class Data { public int data1 = 20; public void printData() { System.out.println("data1 = "+data1); } }
Program Source
import mypack.*; class NewData extends Data { int data2 = 40; void newData(){ System.out.println("data1 = "+data1); System.out.println("data2 = "+data2); } } public class Javaapp { public static void main(String[] args) { NewData nd = new NewData(); nd.newData(); } }