binaryjframe.java

显示一个三位整数的各位数字。含输入数据‘显示结果

//实验6.2  

import java.awt.Color;
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JDialog;

import javax.swing.event.CaretListener;
import javax.swing.event.CaretEvent;

public class BinaryJFrame extends JFrame implements CaretListener
{
    private JTextField text_decimal,text_binary,text_octal,text_hex;
    private ShowmessageJDialog dialog;

    public BinaryJFrame()
    {
        super("十进制整数转换");
        
        this.setSize(200,140);
        this.setResizable(false);                          
        this.setBackground(java.awt.Color.lightGray);
        this.setLocation(300,240);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);      
        this.setLayout(new java.awt.FlowLayout(FlowLayout.LEFT));    
        
        this.add(new JLabel("      十进制"));
        text_decimal = new JTextField("1023",10);
        this.add(text_decimal);
        text_decimal.addCaretListener(this);               

        this.add(new JLabel("      二进制"));
        text_binary = new JTextField(10);
        text_binary.setEditable(false);                    
        this.add(text_binary);

        this.add(new JLabel("      八进制"));
        text_octal = new JTextField(10);
        text_octal.setEditable(false);
        this.add(text_octal);

        this.add(new JLabel("  十六进制"));
        text_hex = new JTextField(10);
        text_hex.setEditable(false);
        this.add(text_hex);

        this.display();
        this.setVisible(true);

        dialog = new ShowmessageJDialog(this);             

    }

    private class ShowmessageJDialog extends JDialog       
    {
        private JFrame frame;                              
        private JLabel label_dialog;

        public ShowmessageJDialog(JFrame frame)            
        {
            super(frame,"提示",true);                      
            this.frame = frame;
            this.setSize(240,80);
            label_dialog = new JLabel("",JLabel.CENTER);   
            this.add(label_dialog); 
            this.setDefaultCloseOperation(HIDE_ON_CLOSE);  
        }

        public void showMessage(String message)            
            label_dialog.setText(message);
            this.setLocation(frame.getX()+100,frame.getY()+100);
            this.setVisible(true);
        }
    }

    public void display()
    {
        try
        {
            int i = Integer.parseInt(text_decimal.getText());
            text_binary.setText(Integer.toBinaryString(i));  
            text_octal.setText(Integer.toOctalString(i));    
            text_hex.setText(Integer.toHexString(i));        
        }
        catch(NumberFormatException nfe)
        {
            dialog.showMessage("\""+text_decimal.getText()+"\" 不能转换成整数，请重新输入!");
        }
        finally{}
    }

    public void caretUpdate(CaretEvent e)                  
    {
        this.display();
    }

    public static void main(String arg[])
    {
        new BinaryJFrame();
    }
}