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接口功能介绍
1、‘纯’抽象类的实现（参见JAVA编程思想P/153）
// Interface1.java 接口只负责描述自己的样子“对于实现我的所有的类，看起来都应该象我这个样子。我所有的方法，实现类都必须有！”
public interface Interface1 {
public void setS(String str);
public String getS();
public void ShowMessage(String MSG);
}
=====================================================================
// ClassItf.java “接口只是一个非常‘纯‘的抽象的东西，你的实现代码都在我这里！”
public class ClassItf implements Interface1{
public String S = "";
public ClassItf() {
}
public void ShowMessage(String MSG)
{
System.out.print(this.getClass().getName()+"====="+MSG+"====by Interface1n/"); }
public void setS(String str)
{
S = str;
}
public String getS()
{
return S;
}
}
2、多重继承的实现（参见JAVA编程思想P/155）
//Interfase2.java 接口的样子
public interface Interface2 {
public void ShowMessage2(String MSG);
}
// ClassItf.java 加入多重继承后的ClassItf 灰底为加入更改、插入行
public class ClassItf implements Interface1,Interface2{
public String S = "";
public ClassItf() {
}
public void ShowMessage(String MSG)
{
System.out.print(this.getClass().getName()+"====="+MSG+"====by Interface1n/");
}
public void setS(String str)
{
S = str;
}
public String getS()
{
return S;
}
public void ShowMessage2(String MSG)
{
System.out.print(this.getClass().getName()+"====="+MSG+"====by Interface2n/");
}
}
呵呵！我的多重继承功能在JAVA中有着大量的应用如：
public class JFrame extends Frame implements WindowConstants, Accessible, RootPaneContainer
3、外观与实现分离
// ClassItf.java “接口只是一个非常‘纯‘的抽象的东西，你的实现代码都在我这里！”
public class ClassItf implements Interface1,Interface2{
public String S = "";
public ClassItf() {
}
public void ShowMessage(String MSG)// 实现了接口‘Interface1’ShowMessage
{
System.out.print(this.getClass().getName()+"====="+MSG+"====by Interface1n/");
}
public void setS(String str) //实现了接口‘Interface1’setS
{
S = str;
}
public String getS()//实现了接口‘Interface1’getS
{
return S;
}
public void ShowMessage2(String MSG)// 实现了接口‘Interface2’ ShowMessage2
{
System.out.print(this.getClass().getName()+"====="+MSG+"====by Interface2n/");
}
}
4、提供调用的影子
public void ShowMessage(Interface1 req)
{
req.ShowMessage("111");
}
public void ShowMessage2(Interface2 req)
{
req.ShowMessage2("111");
}
void jButton1_actionPerformed(ActionEvent e) {
private ClassItf C1 = new ClassItf();
ShowMessage(C1);
ShowMessage2(C1);
}
同样呀，我的应用也非常的广呀！
比如在Servlet的
public void doPost(HttpServletRequest request,HttpServletResponse response)
public void doGet(HttpServletRequest request,HttpServletResponse response)
HttpServletRequest ,HttpServletResponse我的应用！
其它如：
事件Listen呀：
public void addActionListener(ActionListener l)
Observer模式呀！
5、通过接口实现引用传递
public void SetS1(Interface1 req)
{
req.setS("New Value with C1");
}
public void SetS2(ClassNoitf req)
{
req.setS("New Value with C2");
}
void jButton3_actionPerformed(ActionEvent e) {
ClassItf C1 = new ClassItf();
ClassNoitf C2 = new ClassNoitf();
//Set C1
SetS1(C1);
//Set C2;
SetS2(C2);
//Get Value
System.out.print(C1.getS());
System.out.print(C2.getS());
}
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发表于 2005-3-1 23:21:00