jsliderusedemo.java

JAVA编程思想源代码 值得一下 很难找的

package chapter11;

import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class JSliderUseDemo extends JFrame {
	public static final int WIDTH = 400;

	public static final int HEIGHT = 280;

	public final JLabel choosedLabel = new JLabel("您选择年龄:");

	public final JLabel choiceLabel = new JLabel("请选择年龄:");

	private JTextField myTextField;

	private JPanel agePanel;

	public JSliderUseDemo() {
		setTitle("JSliderUseDemo");
		setSize(WIDTH, HEIGHT);

		AgeListener myAgeListener = new AgeListener();
		// 建立容纳滑块的面板
		agePanel = new JPanel();

		// 新建缺省样式的滑块
		JSlider ageSlider = new JSlider();
		ageSlider.addChangeListener(myAgeListener);
		agePanel.add(choiceLabel);
		agePanel.add(ageSlider);

		// 新建竖向滑块，并指定最大值和初始值。
		ageSlider = new JSlider(SwingConstants.VERTICAL, 0, 100, 20);
		ageSlider.addChangeListener(myAgeListener);
		agePanel.add(ageSlider);

		// 建立容纳文本域的面板
		JPanel textPanel = new JPanel();
		// 新建文本域
		myTextField = new JTextField("", 15);
		textPanel.add(choosedLabel, BorderLayout.NORTH);
		textPanel.add(myTextField, BorderLayout.CENTER);

		add(agePanel, BorderLayout.NORTH);
		add(textPanel, BorderLayout.CENTER);
	}

	// 两个滑块共用的事件监听器
	private class AgeListener implements ChangeListener {
		public void stateChanged(ChangeEvent event) {
			JSlider sourceSlider = (JSlider) event.getSource();
			myTextField.setText("" + sourceSlider.getValue());
		}
	}

	public static void main(String[] args) {
		JSliderUseDemo frame = new JSliderUseDemo();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
}