ex9_10.java

Java与面向对象程序设计实验教学讲义.复数类的实现,复数类的复杂运算,身份证号码的分析,图形界面设计

//Ex9_10.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
public class Ex9_10 implements ActionListener ,ItemListener
{
  static JFrame f=null;  //因为要在main静态方法中被引用，所以必须设为static类型
  ButtonGroup bg;      //按钮组，可组合若干单选按钮
  JComboBox combo;      //下拉式列表框
  JSpinner s1;         //有序变化选择框
  JLabel L3;          //显示计算结果的标签
  JRadioButton r1,r2,r3,r4;  //单选按钮
  int op=0;
    
  public Ex9_10()
  {    
    f=new JFrame("第二类原子组件演示"); //新建一个窗体
    Container contentPane=f.getContentPane();
    
    JPanel p1=new JPanel();            //新建一个Panel
    p1.setLayout(new GridLayout(1,4));
    //设置边框
    p1.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(
           Color.blue,2),"选择运算种类",TitledBorder.CENTER,TitledBorder.TOP));
    //单选按钮
    r1=new JRadioButton("＋");        
    r2=new JRadioButton("－");
    r3=new JRadioButton("×");
    r4=new JRadioButton("÷");
    p1.add(r1);
    p1.add(r2);
    p1.add(r3);
    p1.add(r4);        
    bg=new ButtonGroup();       //按钮组，组合4个单选按钮，使一次只能选择一个
    bg.add(r1);
    bg.add(r2);
    bg.add(r3);
    bg.add(r4);
    r1.addItemListener(this);  //为单选按钮增加ItemListener事件监听器
    r2.addItemListener(this);
    r3.addItemListener(this);
    r4.addItemListener(this);        
    
    JPanel p2=new JPanel();  //新建第二个Panel
    p2.setLayout (new GridLayout(2,2));
    p2.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder
        (Color.blue,2),"选择或输入操作数",TitledBorder.CENTER,TitledBorder.TOP));
    JLabel L1=new JLabel("第一个操作数：");
    JLabel L2=new JLabel("第二个操作数："); 
    //创建下拉式列表框
    String[] data1={"0","10","20","30","40","50","60","70","80","90","100"};
    combo=new JComboBox(data1);
    combo.setEditable (true);
    ComboBoxEditor editor=combo.getEditor();
    combo.configureEditor (editor,"请选择或直接输入数字");           
           
    SpinnerModel sM1 = new SpinnerNumberModel(50,0,100,1);  //创建有序变化选择框
    s1=new JSpinner(sM1);

    p2.add(L1);
    p2.add(combo);
    p2.add(L2);
    p2.add(s1);
    JPanel p3=new JPanel();  //创建一个新的Panel
    p3.setLayout (new GridLayout(1,2));
    JButton button1=new JButton("计   算");
    L3=new JLabel("",SwingConstants.CENTER);
    p3.add(button1);
    p3.add(L3);
    button1.addActionListener (this);       
    //将三个Panel加在内容面板上
    contentPane.add(p1,BorderLayout.NORTH);
    contentPane.add(p2,BorderLayout.CENTER);        
    contentPane.add(p3,BorderLayout.SOUTH); 

    f.getRootPane ().setDefaultButton (button1); //设置窗体回车对应按钮
    f.pack(); //排版
    f.addWindowListener(new WindowAdapter() {
       public void windowClosing(WindowEvent evt) {
                System.exit(0);
       }
    });
  }
    
  public void itemStateChanged(ItemEvent e)  //单选钮被点击时触发
  {
    if(e.getSource()==r1) op=1;
    if(e.getSource()==r2) op=2;
    if(e.getSource()==r3) op=3;
    if(e.getSource()==r4) op=4;
  }   	  
    	      
  public void actionPerformed(ActionEvent e)  //计算按钮被点击时触发
  {
    double a=Double.parseDouble(combo.getSelectedItem ().toString ());
    double b=Double.parseDouble(s1.getValue ().toString());
    double c;
    switch (op)
    {
       case 1:
          c=a+b;
          L3.setText(""+c);
          break;
        case 2:
          c=a-b;
          L3.setText(""+c);
          break;
        case 3:
          c=a*b;
          L3.setText(""+c);
          break;
        case 4:
          c=a/b;
          L3.setText(""+c);
          break;
        default:
          L3.setText("请选择运算符");
    }
  }  
     
  public static void main(String args[])
  {
      new Ex9_10();         
      new PassWord(f);      //新建一输入密码对话框
  }    
}

class PassWord implements ActionListener  //输入密码对话框类
{
JTextField user;
JPasswordField passWd;
JButton b1,b2;
Container dialogPane;
JDialog d;
JFrame f;
		  
public PassWord(JFrame f)
{
    d=new JDialog();  //新建一对话框
    d.setTitle ("请输入用户名和密码");  //设置标题
    dialogPane = d.getContentPane();   
    dialogPane.setLayout(new GridLayout(3,2));
    dialogPane.add(new JLabel("用户名 ",SwingConstants.CENTER)); 
    user=new JTextField();
    dialogPane.add(user);
    dialogPane.add(new JLabel("密  码",SwingConstants.CENTER));
    passWd=new JPasswordField();
    dialogPane.add(passWd);
    b1=new JButton("确定");
    b2=new JButton("退出");
    dialogPane.add(b1);
    dialogPane.add(b2);
    b1.addActionListener (this);
    b2.addActionListener (this);        
    d.setBounds(200,150,400,130);  //设定大小
    d.getRootPane ().setDefaultButton (b1); //设定回车对应按钮
    d.setVisible (true);
    this.f=f;
}
public void actionPerformed(ActionEvent e)
{
    String cmd = e.getActionCommand();
    if (cmd.equals("确定"))
    {
        String name=user.getText ();
        String passWord=passWd.getText ();
        if((name.equals("test")) && (passWord.equals("1234"))) //用户名和密码正确
        {
           d.dispose ();  //关闭对话框
           f.setVisible (true);  //显示主窗体
           return;
        }
        else  //用户名或密码错误则出现错误信息对话框，并清空以前输入
        {
           JOptionPane.showMessageDialog (d,"错误的用户名或密码",
                              "请重新输入",JOptionPane.WARNING_MESSAGE);
           user.setText ("");
           passWd.setText ("");
        }            
    }
    if(cmd.equals("退出"))  System.exit(0);
  }
}