下面的示例展示了如何在Java Swing应用程序中创建微调器。
使用以下API。
JSpinner()- 创建一个微调器。JSpinner.getValue()- 获取微调器的当前值。
示例
package com.yiibai.swingdemo;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class SwingTester {
private JFrame mainFrame;
private JLabel headerLabel;
private JLabel statusLabel;
private JPanel controlPanel;
public SwingTester() {
prepareGUI();
}
public static void main(String[] args) {
SwingTester swingControlDemo = new SwingTester();
swingControlDemo.showSpinnerDemo();
}
private void prepareGUI() {
mainFrame = new JFrame("Swing微调器示例");
mainFrame.setSize(400, 400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent) {
System.exit(0);
}
});
headerLabel = new JLabel("", JLabel.CENTER);
statusLabel = new JLabel("", JLabel.CENTER);
statusLabel.setSize(350, 100);
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showSpinnerDemo() {
headerLabel.setText("Control in action: JSpinner");
SpinnerModel spinnerModel = new SpinnerNumberModel(10, // initial value
0, // min
100, // max
1);// step
JSpinner spinner = new JSpinner(spinnerModel);
spinner.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
statusLabel.setText("当前值 : " + ((JSpinner) e.getSource()).getValue());
}
});
controlPanel.add(spinner);
mainFrame.setVisible(true);
}
}
执行上面示例代码，得到以下结果：
