Java复习编程题 30(8)

private TextArea t; public Chp9_3_F() {

super(\菜单示例\

t=new TextArea(\欢迎你进入Java世界\t.setFont(new Font(\宋体\add(\//create Menu Bar

MenuBar bar=new MenuBar(); //create font Menu

Menu fontMenu=new Menu(\字体\//create three MenuItems

MenuItem mi1=new MenuItem(\宋体\MenuItem mi2=new MenuItem(\黑体\MenuItem mi3=new MenuItem(\隶书\//add MenuItems to Menu fontMenu.add(mi1); fontMenu.add(mi2); fontMenu.add(mi3); //add Menu to Menu Bar bar.add(fontMenu);

//set the Menu Bar for the frame setMenuBar(bar);

setSize(300,200); setVisible(true);

mi1.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ t.setFont(new Font(\宋体\} });

mi2.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ t.setFont(new Font(\黑体\} });

mi3.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ t.setFont(new Font(\隶书\} }); }

public static void main(String[] args) {

new Chp9_3_F(); } }

运行结果为：

5. 参考程序如下： import java.awt.*; import java.awt.event.*;

public class Chp9_3_C extends Frame implements ActionListener{ TextField textField1,textField2,textField3; Button button1=new Button(\求和\Panel panel1,panel2; public Chp9_3_C(){

textField1=new TextField(); textField2=new TextField(); textField3=new TextField(); panel1=new Panel(); panel2=new Panel();

panel1.setLayout(new GridLayout(3,2)); panel2.setLayout(new FlowLayout()); panel1.add(new Label(\数学: \panel1.add(textField1);

panel1.add(new Label(\英语: \

panel1.add(textField2);

panel1.add(new Label(\总分: \panel1.add(textField3); panel2.add(button1);

add(panel1,BorderLayout.CENTER); add(panel2,BorderLayout.SOUTH); button1.addActionListener(this); setSize(300,200); setVisible(true); }

public static void main(String[] args){ new Chp9_3_C(); }

public void actionPerformed(ActionEvent e){ int n1,n2,sum;

n1=Integer.parseInt(textField1.getText()); n2=Integer.parseInt(textField2.getText()); sum=n1+n2;

textField3.setText(\} }

运行结果如下：

5．参考程序如下： import java.awt.*; import java.awt.event.*;

public class Chp9_3_D extends Frame{ TextField textField1,textField2; Button button1; public Chp9_3_D(){

textField1=new TextField(30); textField2=new TextField(30); button1=new Button(\转换\setLayout(new FlowLayout()); add(new Label(\华氏温度：\add(textField1);

add(new Label(\摄氏温度：\add(textField2);

textField2.setEditable(false); add(button1); setSize(400,300); pack();

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