Java2实用教程（第5版）最新答案-耿祥义

}

treemap.clear();

for(int k=0;k

key[k]=new UDiscKey(UDisc[k].price); }

for(int k=0;k

number=treemap.size(); collection=treemap.values(); iter=collection.iterator(); while(iter.hasNext()) { UDisc disc=iter.next();

System.out.println(\元\ } } }

习题十六（第16章）

1． import java.applet.*;

import java.awt.*; import java.awt.event.*; import javax.swing.*;

public class Xiti2 extends Applet implements ActionListener { TextField text1,text2; Label label; public void init()

{ text1=new TextField(10); text2=new TextField(20);

Box box1=Box.createHorizontalBox(); Box box2=Box.createHorizontalBox(); Box boxV=Box.createVerticalBox();

box1.add(new Label(\输入一个数回车确定:\ box1.add(text1);

label=new Label(\数的平方:\ box2.add(label); box2.add(text2); boxV.add(box1); boxV.add(box2); add(boxV);

text2.setEditable(false); text1.addActionListener(this); }

public void actionPerformed(ActionEvent e) { String number=e.getActionCommand(); try{ double n=Double.parseDouble(number); double m=n*n;

label.setText(n+\的平方:\ text2.setText(\ text1.setText(\ validate(); }

catch(NumberFormatException exp) { text2.setText(\ } } }

2． import java.applet.*;

import java.awt.*;

public class Rect extends Applet { int w,h;

public void init() {

String s1=getParameter(\ //从html得到\的值。 String s2=getParameter(\ //从html得到\的值。 w=Integer.parseInt(s1); h=Integer.parseInt(s2); }

public void paint(Graphics g) { g.drawRect(10,10,w,h); } }

/*

*/