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主讲教师:	李青TEL:	15895982720Email:	LKJ0986@sina.com.cn信息技术学院复习类的继承性publicclassEmployee
{
privateStringname;
privateintid;
//静态数据成员nextId属于Employee类，而不属于类的某个对象。
privatestaticintTId=1;

publicEmployee(Strings){
name=s;
id=0;
		setId();
}

publicStringgetName()
{
returnname;
}
publicvoidsetName(Stringname)
{
this.name=name;
}

publicintgetId()
{
returnid;
}
publicvoidsetId()
{
id=TId;
TId++;
}
publicstaticintgetNextId()
{
returnnextId;//returnstaticfield
}

publicstaticvoidmain(String[]args){
Employeee1=newEmployee("Harry");
System.out.println(e1.getName()"\t"	+e1.id);
Employeee2=newEmployee("Tom");
System.out.println(e2.getName()+"\t"+e2.id);
Employeee3=newEmployee("Kidd");
System.out.println(e3.getName()+"\t"+e3.id);
}
}
importjava.awt.*;
publicclassFrameTest{
	publicstaticvoidmain(String[]args)	{
		Framefrm=newFrame("MyfirstFrame");
		frm.setSize(100,100);
		frm.setVisible(true);
	}
}importjava.awt.*;
classColorsPanelextendsPanel{
publicvoidpaint(Graphicsg){
Fontf=newFont("Georgia",Font.ITALIC,16);
g.setFont(f);
g.setColor(Color.red);
g.drawString("Hello",75,100);
g.setColor(newColor(0,128,128));
g.drawString("World",75,125);
}
}importjava.awt.*;
importjava.awt.event.*;
publicclassMousePaintextendsFrameimplementsMouseListener
{
staticMousePaintfrm=newMousePaint();
staticintx1=0,x2=0,y1=0,y2=0;
publicstaticvoidmain(Stringargs[])
{
frm.setTitle("鼠标作图");
frm.setSize(200,150);
frm.addMouseListener(frm);
frm.setVisible(true);
}

publicvoidmouseEntered(MouseEvente){}
publicvoidmouseClicked(MouseEvente){}
publicvoidmouseExited(MouseEvente){}
publicvoidmousePressed(MouseEvente){x1=e.getX();y1=e.getY();}
publicvoidmouseReleased(MouseEvente){x2=e.getX();y2=e.getY();repaint();}
publicvoidpaint(Graphicsg)
{
g.setColor(Color.blue);
g.drawLine(x1,y1,x2,y2);
}
}窗口关闭事件的实现用内部类实现窗口的关闭事件在java.io包中有四个基本类：InputStream、OutputStream及Reader、Writer类，它们分别处理字节流和字符流。如图8.2所示。importjava.io.*;
publicclassCopyBytes{
publicstaticvoidmain(String[]args)throwsIOException{
FileinputFile=newFile(“original.tx