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1Addend.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1fieldAdd.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2Augend.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2fieldAug.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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正如我总是意犹未尽的想起你。
