【Java】Swing 初步 · 常用 Swing 組件的簡易演示

爲了鍛鍊大家閱讀代碼的能力，本代碼無註釋。
演示的組件有：JFrame, JPanel, JMenuBar, JMenu, JMenuItem, JComboBox, JRadioButton, ButtonGroup, JCheckBox, JLabel, JTextField, JTextArea, JPasswordField。
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-，-媽的，我說怎麼單選按鈕 radio2 一直顯示不出來，原來是把 radio2.setBound() 也給寫成 radio1.setBound() 了。
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import java.awt.*;
import javax.swing.*;
public class Demo1 {
    public static void main(String[] args) {
		JFrame wnd = new JFrame("Main Window"); JPanel pnl = new JPanel();
		wnd.setContentPane(pnl); wnd.setBounds(640, 360, 640, 360);
        wnd.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); wnd.setVisible(true);
        pnl.setBackground(Color.lightGray); pnl.setLayout(null);

        JMenuBar menuBar = new JMenuBar();
        JMenu menuFile = new JMenu("File"), submenu1Settings = new JMenu("Settings");
        JMenuItem menuItemNew = new JMenuItem("New"), menuItemOpen = new JMenuItem("Open"), 
        menuItemSave = new JMenuItem("Save"), menuItemSaveAs = new JMenuItem("Save As"), 
        menuItemExit = new JMenuItem("Exit"), menuItemGeneral = new JMenuItem("General");
        menuBar.add(menuFile); menuFile.add(submenu1Settings);
        menuFile.add(menuItemNew); menuFile.add(menuItemOpen); menuFile.add(menuItemSave);
        menuFile.add(menuItemSaveAs); menuFile.add(menuItemExit);
        submenu1Settings.add(menuItemGeneral);
        wnd.setJMenuBar(menuBar);

        JComboBox combo1 = new JComboBox<String>();
        combo1.addItem("File1"); combo1.addItem("File2"); combo1.setBounds(10, 5, 140, 20);
        pnl.add(combo1);

        JRadioButton radio1 = new JRadioButton("Valid"), radio2 = new JRadioButton("Invalid");
        ButtonGroup buttonGroup = new ButtonGroup();
		buttonGroup.add(radio1); buttonGroup.add(radio2);
		radio1.setBounds(160, 10, 70, 10); radio2.setBounds(240, 10, 70, 10);
        pnl.add(radio1); pnl.add(radio2);

		JCheckBox check1 = new JCheckBox("Enable"), check2 = new JCheckBox("Enable");
		check1.setBounds(320, 10, 70, 10); check2.setBounds(400, 10, 70, 10);
        pnl.add(check1); pnl.add(check2);

        JLabel label = new JLabel("Input:");
        label.setBounds(10, 30, 600, 15);
        pnl.add(label);

        JTextField textField = new JTextField("C:\\Windows\\system32\\");
        textField.setBounds(10, 50, 600, 20);
        pnl.add(textField);

        JTextArea textArea = new JTextArea("****DEMO****");
        textArea.setBounds(10, 75, 600, 100);
        pnl.add(textArea);

        JPasswordField pwField = new JPasswordField();
        pwField.setBounds(10, 180, 200, 20);
        pnl.add(pwField);

		wnd.validate(); 
    }
}

運行截圖：