memosaver.java

本压缩文件中含有线程的控制

package gui;

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

public class MemoSaver extends JFrame implements ActionListener {

	public static final int WIDTH = 600;

	public static final int HEIGHT = 300;

	public static final int LINES = 8;

	public static final int CHAR_PER_LINE = 30;

	private JTextArea theText;

	private String memo1 = "No memo 1.";

	private String memo2 = "No memo 2.";

	public MemoSaver(String str) {
		super(str);
		setSize(WIDTH, HEIGHT);
		setLocation(400, 200);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container contentPane = getContentPane();
		contentPane.setLayout(new BorderLayout());

		JPanel buttonPanel = new JPanel();
		buttonPanel.setBackground(Color.WHITE);
		buttonPanel.setLayout(new FlowLayout());

		JButton memo1Button = new JButton("Save memo 1");
		JButton memo2Button = new JButton("Save memo 2");
		JButton clear = new JButton("Clear");
		JButton get1Button = new JButton("Get memo 1");
		JButton get2Button = new JButton("Get memo 2");

		memo1Button.addActionListener(this);
		memo2Button.addActionListener(this);
		clear.addActionListener(this);
		get1Button.addActionListener(this);
		get2Button.addActionListener(this);

		buttonPanel.add(memo1Button);
		buttonPanel.add(memo2Button);
		buttonPanel.add(clear);
		buttonPanel.add(get1Button);
		buttonPanel.add(get2Button);

		JPanel textPanel = new JPanel();

		textPanel.setBackground(Color.LIGHT_GRAY);

		theText = new JTextArea(LINES, CHAR_PER_LINE);
		JScrollPane scrolledText = new JScrollPane(theText);
		theText.setFont(new Font("Arial", Font.BOLD, 20));
		theText.setBackground(Color.WHITE);
		scrolledText.setHorizontalScrollBarPolicy(
				JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
		scrolledText.setVerticalScrollBarPolicy(
				JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
		textPanel.add(scrolledText);

		contentPane.add(textPanel, BorderLayout.CENTER);
		contentPane.add(buttonPanel, BorderLayout.SOUTH);

		buttonPanel.add(memo1Button);
		buttonPanel.add(memo2Button);

	}

	public void actionPerformed(ActionEvent e) {
		String actionCommand = e.getActionCommand();

		if (actionCommand.equals("Save memo 1")) {
			memo1 = theText.getText();
		} else if (actionCommand.equals("Save memo 2")) {
			memo2 = theText.getText();
		} else if (actionCommand.equals("Clear")) {
			theText.setText("");
		} else if (actionCommand.equals("Get memo 1")) {
			theText.append("\n" + memo1);
		} else if (actionCommand.equals("Get memo 2")) {
			theText.append("\n" + memo2);
		}

	}

	public static void main(String[] args) {
		MemoSaver guiMemo = new MemoSaver("memo saver");
		guiMemo.setVisible(true);
	}
}