2017年計算機二級考試章節(jié)輔導(dǎo)：Java按鈕控件學(xué)習(xí)教程

    8.2 按鈕控件
    圖8-1中有一個AbstractButton類，該類是Swing中所有按鈕的父類，該類的三個直接派生類JButton、JToggleButton和JMenuItem。
    JButton與AWT中的Button類似，JButton有一個直接子類為BasicArrowButton，是一個帶有箭頭的按鈕（箭頭有上、下、左、右四個方向）。
    JToggleButton表示一個切換按鈕，該類有兩個直接子類是我們經(jīng)常使用到的，JRadioButton—單選按鈕和JCheckBox—復(fù)選按鈕。
    JMenuItem包括三個直接子類，它們都是與菜單相關(guān)的按鈕。
    程序[例8-3]演示了各個按鈕的用法。
    [8-3]
    import java.awt.*;
    import javax.swing.*;
    import javax.swing.plaf.basic.BasicArrowButton;
    import java.awt.event.*;
    class ButtonsTest extends JFrame{
    private JButton jbutton = new JButton("JButton");
    private BasicArrowButton
    basicArrowButtonUp= new BasicArrowButton(BasicArrowButton.NORTH),
    basicArrowButtonDown= new BasicArrowButton(BasicArrowButton.SOUTH),
    basicArrowButtonLeft= new BasicArrowButton(BasicArrowButton.WEST),
    basicArrowButtonRight= new BasicArrowButton(BasicArrowButton.EAST);
    private JToggleButton jtoggleButton = new JToggleButton("JToggleButton");
    private JCheckBox jcheckBox = new JCheckBox("JCheckBox");
    private JRadioButton jradioButton = new JRadioButton("JRadioButton");
    public ButtonsTest(String title){
    super(title);
    Container contentPane = this.getContentPane();
    contentPane.setLayout(new FlowLayout(5));
    contentPane.add(jbutton);
    contentPane.add(basicArrowButtonUp);
    contentPane.add(basicArrowButtonDown);
    contentPane.add(basicArrowButtonLeft);
    contentPane.add(basicArrowButtonRight);
    contentPane.add(jtoggleButton);
    contentPane.add(jcheckBox);
    contentPane.add(jradioButton);
    this.pack();
    this.setVisible(true);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    }
    public class Test8_3 {
    public static void main(String[] args) {
    new ButtonsTest("java各種按鈕測試");
    }
    }