Swing微調器範例

下面的範例展示了如何在Java Swing應用程式中建立微調器。

使用以下API。

• JSpinner() - 建立一個微調器。
• JSpinner.getValue() - 獲取微調器的當前值。

範例

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微調器範例");
        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("當前值 : " + ((JSpinner) e.getSource()).getValue());
            }
        });
        controlPanel.add(spinner);
        mainFrame.setVisible(true);
    }
}

執行上面範例程式碼，得到以下結果：