《Java程序设计》第16周周四：GUI编程及文件对话框的使用 计算器

项目三：实验六 图形用户界面(教材P279-280)

目标：完成实验六的内容。

运行代码

import java.awt.Frame;

import java.awt.Button;

import java.awt.Label;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.awt.FlowLayout;

import java.awt.TextField;

import java.awt.TextArea;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Color;

import java.lang.Exception;

public class ChatServer implements ActionListener

{

private Frame Fm = new Frame();

private Button quit = new Button("退出");

private Button Add = new Button("+");

private Button Sub = new Button("-");

private Button Mul = new Button("×");

private Button Div = new Button("÷");

private Label Addend = new Label("操作数1：");

private Label Augend = new Label("操作数2：");

private Label Sum = new Label("结果：");

private TextField fieldAdd = new TextField();

private TextField fieldAug = new TextField();

private TextArea areaSum = new TextArea();

private Font Ft = new Font("宋体",Font.BOLD,18);

public ChatServer()

{

Fm.setTitle("TYH号计算器");

Fm.setBounds(200,100,400,300);

Fm.setLayout(new FlowLayout(FlowLayout.LEFT,20,20));

Fm.add(Addend);//标签--操作数1

Addend.setFont(Ft);//字体类型

Addend.setForeground(Color.black);//设置字体颜色

Addend.setPreferredSize(new Dimension(100,30));//设置组件尺寸

Fm.add(fieldAdd);//输入区--操作数1

fieldAdd.setPreferredSize(new Dimension(100,30));//设置组件尺寸

fieldAdd.setFont(Ft);//字体类型

fieldAdd.setForeground(Color.black);

Fm.add(Add);

Add.addActionListener(this);

Fm.add(Sub);

Sub.addActionListener(this);

Fm.add(Augend);//标签--操作数2

Augend.setFont(Ft);

Augend.setForeground(Color.black);

Augend.setPreferredSize(new Dimension(100,30));//设置组件尺寸

Fm.add(fieldAug);//输入区--操作数2

fieldAug.setPreferredSize(new Dimension(100,30));//设置组件尺寸

fieldAug.setFont(Ft);

fieldAug.setForeground(Color.black);

Fm.add(Mul);

Mul.addActionListener(this);

Fm.add(Div);

Div.addActionListener(this);

Fm.add(Sum);//标签--结果

Sum.setFont(Ft);

Sum.setForeground(Color.black);

Sum.setPreferredSize(new Dimension(100,30));//设置组件尺寸

Fm.add(areaSum);

areaSum.setPreferredSize(new Dimension(100,30));//设置组件尺寸

areaSum.setFont(Ft);

areaSum.setForeground(Color.red);

Fm.add(quit);

quit.addActionListener(this);

Fm.setVisible(true);

}

public void actionPerformed(ActionEvent e)

{

try

{

if(e.getSource()==quit)

System.exit(0);

else if(e.getSource()==Add)

areaSum.setText(Double.toString(Double.parseDouble(fieldAdd.getText()) + Double.parseDouble(fieldAug.getText())));

else if(e.getSource()==Sub)

areaSum.setText(Double.toString(Double.parseDouble(fieldAdd.getText()) - Double.parseDouble(fieldAug.getText())));

else if(e.getSource()==Mul)

areaSum.setText(Double.toString(Double.parseDouble(fieldAdd.getText()) * Double.parseDouble(fieldAug.getText())));

else if(e.getSource()==Div)

areaSum.setText(Double.toString(Double.parseDouble(fieldAdd.getText()) / Double.parseDouble(fieldAug.getText())));

}

catch(Exception Ex)

{

areaSum.setText("出错了："+Ex);

}

}

public static void main(String args[])

{

ChatServer call = new ChatServer();

}

}运行结果

问题：背景不会弄，面板也不会布局

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