java复习题带答案(5)

}

}

CalculatorArea(float l, float w){ this.cLength = l; this.cWidth = w; this.cArea = w*l;

System.out.println(cArea); }

CalculatorArea(float l, float w, float h){ this.cLength = l; this.cWidth = w; this.cHeight = h;

this.cArea = 2*(w*l+w*h+h*l); System.out.println(cArea); }

public static void main(String[] args) {

CalculatorArea s[] = new CalculatorArea[3]; s[0] = new CalculatorArea(1); s[1] = new CalculatorArea(1,1); s[2] = new CalculatorArea(1,1,1); }

5. 编写Applet程序：求三个整数的最小值。 import java.applet.*; import java.awt.*;

import java.awt.event.*;

public class FindMin extends Applet implements ActionListener {

Label result;

TextField in1,in2,in3; Button btn1,btn2;

int a=0,b=0,c=0,min; public void init() {

result=new Label(\请先输入三个待比较的整数\); in1=new TextField(5); in2=new TextField(5); in3=new TextField(5); btn1=new Button(\比较\); btn2=new Button(\关闭\); add(in1); add(in2); add(in3); add(btn1); add(btn2); add(result);

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btn1.addActionListener(this); btn2.addActionListener(this); }

public void actionPerformed(ActionEvent e) {

if (e.getSource()==btn1)

{ a=Integer.parseInt(in1.getText()); b=Integer.parseInt(in2.getText()); c=Integer.parseInt(in3.getText()); min=a;

if (b

result.setText(\三数中最小值是:\+min); }

else

System.exit(0);

} }

6. 创建一个标题为“按钮”的窗框，窗框中显示有“按下我”字样的按钮盒一个文本框，当单击时会在文本框上显示“Hello Java”。 import java.awt.*;

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

public class ArtFont extends JFrame implements ActionListener{ JButton Btn;

JTextArea txtArea; Font font;

public ArtFont(){

super(\按钮\);

font = new Font(\宋体\, 1,15); Btn = new JButton(\按下我\);

txtArea = new JTextArea(10, 80); txtArea.setFont(font);

Btn.addActionListener(this);

Container container = getContentPane(); container.setLayout(new BorderLayout()); setSize(300, 200);

container.add(txtArea, BorderLayout.CENTER); container.add(Btn, BorderLayout.PAGE_END); setVisible(true); }

public static void main(String[] args) { ArtFont a = new ArtFont(); }

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public void actionPerformed(ActionEvent e) { txtArea.setText(\); } }

7. 编写一个具有标准的菜单条的独立应用程序，包含菜单File，File菜单又包含菜单项Exit，当单击菜单项Edit时关闭窗口。

8. 编写一个Frame来显示字符串，显示字符串及位置，字体、字体大小和颜色通过HTML文件中的参数来传递。

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