extend.java

JAVA程序设计课程中各章节的程序实例。

//one interface can extebd another.
interface a {

void meth1();
void meth2();

}

//b now includes meth1() and meth2()-----it adds meth3().

interface b extends a {

void meth3();

}


//now this class must implement all of class a and b.

class myclass implements b {

public void meth1 () {

System.out.println("implement meth1().");

}


public void meth2 () {

System.out.println("implement meth2().");

}


public void meth3 () {

System.out.println("implement meth3().");

}

}

class extend {

public static void main (String args[]) {

myclass ob = new myclass();

ob.meth1();
ob.meth2();
ob.meth3();

}

}