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问题描述:
要能在Eclipse下运行通过。感激涕零！
解析:
很简单啊,我给你一个java类库里的接口怎样啊?是一个经常用到的MouseListener:
/*
* @(#)MouseListener.java 1.17 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.awt.event;
import java.util.EventListener;
/**
* The listener interface for receiving "interesting" mouse events
* (press, release, click, enter, and exit) on a ponent.
* (To track mouse moves and mouse drags, use the
* codeMouseMotionListener/code.)
* P
* The class that is interested in processing a mouse event
* either implements this interface (and all the methods it
* contains) or extends the abstract codeMouseAdapter/code class
* (overriding only the methods of interest).
* P
* The listener object created from that class is then registered with a
* ponent using the ponent's codeaddMouseListener/code
* method. A mouse event is generated when the mouse is pressed, released
* clicked (pressed and released). A mouse event is also generated when
* the mouse cursor enters or leaves a ponent. When a mouse event
* occurs, the relevant method in the listener object is invoked, and
* the codeMouseEvent/code is passed to it.
*
* @author Carl Quinn
* @version 1.17, 12/19/03
*
* @see MouseAdapter
* @see MouseEvent
* @see a href="java.sun/docs/books/tutorial/post1.0/ui/mouselistener"Tutorial: Writing a Mouse Listener/a
* @see a href="awl/cp/javaseries/jcl1_2"Reference: The Java Class Libraries (update file)/a
*
* @since 1.1
*/
public interface MouseListener extends EventListener {
/**
* Invoked when the mouse button has been clicked (pressed
* and released) on a ponent.
*/
public void mouseClicked(MouseEvent e);
/**
* Invoked when a mouse button has been pressed on a ponent.
*/
public void mousePressed(MouseEvent e);
/**
* Invoked when a mouse button has been released on a ponent.
*/
public void mouseReleased(MouseEvent e);
/**
* Invoked when the mouse enters a ponent.
*/
public void mouseEntered(MouseEvent e);
/**
* Invoked when the mouse exits a ponent.
*/
public void mouseExited(MouseEvent e);
}
接口与类的写法差不多,这个接口放在MouseListener.java(称为一个编辑单元)里.
//Muitiplication接口
public interface Muitiplication{
double mult(double a, double b);
}
//MuitiplicationImpl实现类
public class MuitiplicationImpl implements Muitiplication{
public double mult(double a, double b){
return a * b;
}
}
//MuitiplicationImpls实现类
public class MuitiplicationImpls implements Muitiplication{
public double mult(double a, double b){
return a + b;
}
}
public static void main(args[]){
MuitiplicationImpl m = new MuitiplicationImpl();
System.out.println(m.mult(1.001,1.001));
MuitiplicationImpls ms = new MuitiplicationImpls();
System.out.println(ms.mult(1.001,1.001));
}
interface Bike{
public void radio();
}
interface Car{
public void tv();
}
interface Dt{
public void music();
}
public class InterfaceDemo implements Bike,Car,Dt{
public void radio() {
System.out.println("可以听广播");
}
public void tv() {
System.out.println("可以看电视");
}
public void music() {
System.out.println("可以听音乐");
}
public static void main(String args[])
{
InterfaceDemo m=new InterfaceDemo();
m.radio();
m.tv();
m.music();
}
}
Display.java 接口代码如下：
public interface Display {
public void dis();
}
接口的实现类DisplayImpl.java 代码如下：
public class DisplayImpl implements Display {
@Override
public void dis() {
// TODO Auto-generated method stub
System.out.println("输出方法");
}
public static void main(String[] args) {
new DisplayImpl().dis();
}
}