textnew.java

来自「翁剀JAVA语言那门课程的教案 很多人都看多他的视频教程可惜没有ppt的教案」· Java 代码 · 共 95 行

//: TextNew.java
// Text fields with Java 1.1 events
import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class TextNew extends Applet {
	Button
		b1 = new Button("Get Text"),
		b2 = new Button("Set Text");
	TextField
		t1 = new TextField(30),
		t2 = new TextField(30),
		t3 = new TextField(30);
	String s = new String();

	public void init() {
		b1.addActionListener(new B1());
		b2.addActionListener(new B2());
		t1.addTextListener(new T1());
		t1.addActionListener(new T1A());
		t1.addKeyListener(new T1K());
		add(b1);
		add(b2);
		add(t1);
		add(t2);
		add(t3);
	}
	
	class T1 implements TextListener {
		public void textValueChanged(TextEvent e) {
			t2.setText(t1.getText());
		}
	}

	class T1A implements ActionListener {
		private int count = 0;
		public void actionPerformed(ActionEvent e) {
			t3.setText("t1 Action Event " + count++);
		}
	}
	
	class T1K extends KeyAdapter {
		public void keyTyped(KeyEvent e) {
			String ts = t1.getText();
			if(e.getKeyChar() ==
				KeyEvent.VK_BACK_SPACE) {
				// Ensure it's not empty:
				if( ts.length() > 0) {
					ts = ts.substring(0, ts.length() - 1);
					t1.setText(ts);
				}
			}
			else
				t1.setText(t1.getText() +
					Character.toUpperCase(
					e.getKeyChar()));
			t1.setCaretPosition(
			t1.getText().length());
			// Stop regular character from appearing:
			e.consume();
		}
	}

	class B1 implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			s = t1.getSelectedText();
			if(s.length() == 0) s = t1.getText();
				t1.setEditable(true);
		}
	}
	
	class B2 implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			t1.setText("Inserted by Button 2: " + s);
			t1.setEditable(false);
		}
	}

	public static void main(String[] args) {
		TextNew applet = new TextNew();
		Frame aFrame = new Frame("TextNew");
		aFrame.addWindowListener(
			new WindowAdapter() {
				public void windowClosing(WindowEvent e) {
					System.exit(0);
				}
			});
		aFrame.add(applet, BorderLayout.CENTER);
		aFrame.setSize(300,200);
		applet.init();
		applet.start();
		aFrame.setVisible(true);
	}
} ///:~