textfields.java

简单的Java Gui,用Java编辑器真接打开

//: c13:TextFields.java
// Text fields and Java events.
// <applet code=TextFields width=375
// height=125></applet>

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
import com.bruceeckel.swing.*;

public class TextFields extends JApplet
{
	JButton	b1 = new JButton("Get Text");
	JButton	b2 = new JButton("Set Text");
	JTextField t1 = new JTextField(30);
	JTextField t2 = new JTextField(30);
	JTextField t3 = new JTextField(30);
	String s = new String();
	UpperCaseDocument ucd = new UpperCaseDocument();
	
	public void init()
	{
		t1.setDocument(ucd);
		ucd.addDocumentListener(new T1());
		b1.addActionListener(new B1());
		b2.addActionListener(new B2());
		DocumentListener d1 = new T1();
		t1.addActionListener(new T1A());
		Container cp = getContentPane();
		cp.setLayout(new FlowLayout());
		cp.add(b1);
		cp.add(b2);
		cp.add(t1);
		cp.add(t2);
		cp.add(t3);
	}
	
	class T1 implements DocumentListener
	{
		public void changedUpdate(DocumentEvent e) {}
		public void insertUpdate(DocumentEvent e)
		{
			t2.setText(t1.getText());
			t3.setText("Text: " + t1.getText());
		}
		public void removeUpdate(DocumentEvent e)
		{
			t2.setText(t1.getText());
		}
	}
	
	class T1A implements ActionListener
	{
		private int count = 0;
		
		public void actionPerformed(ActionEvent e)
		{
			t3.setText("t1 Sction Event " + count++);
		}
	}
	
	class B1 implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			if (t1.getSelectedText() == null)
			{
				s = t1.getText();
			}
			else
			{
				s = t1.getSelectedText();
			}
			
			t1.setEditable(true);
		}
	}
	
	class B2 implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			ucd.setUpperCase(false);
			
			t1.setText("Inserted by Button 2: " + s);
			ucd.setUpperCase(true);
			t1.setEditable(false);
		}
	}
	
	public static void main(String[] args)
	{
		TextFields applet = new TextFields();
		JFrame frame = new JFrame("TextFields");
		frame.getContentPane().add(applet);
		frame.setSize(375, 125);
		applet.init();
		applet.start();
		frame.setVisible(true);
	}
}

class UpperCaseDocument extends PlainDocument
{
	boolean upperCase = true;
	
	public void setUpperCase(boolean flag)
	{
		upperCase = flag;
	}
	
	public void insertString(int offset, String string, AttributeSet attributeSet)
		throws BadLocationException
		{
				if (upperCase)
				{
					string = string.toUpperCase();	
				}
				
				super.insertString(offset, string, attributeSet);					
		}
}///:~