怎样实现单击按钮改变成相应颜色！importjava.awt.*;importjava.awt.event.*;publicclassButtonColorimplementsActionListener,WindowListener{publicstaticvoidmain(Stringargs[]){F...
怎样实现单击按钮 改变成相应颜色！ import java.awt.*; import java.awt.event.*; public class ButtonColor implements ActionListener,WindowListener{ public static void main(String args[]){ Frame f=new Frame("变色"); f.setLayout(new FlowLayout()); Panel p=new Panel(); f.add(p); Button b1=new Button("红色"); Button b2=new Button("蓝色"); Button b3=new Button("黄色"); f.add(b1); f.add(b2); f.add(b3); f.addWindowListener(new ButtonColor()); b1.addActionListener(new ButtonColor()); b2.addActionListener(new ButtonColor()); b3.addActionListener(new ButtonColor()); f.setSize(300,300); f.setVisible(true); } public void actionPerformed(ActionEvent e){ } public void windowActivated(WindowEvent e) {} public void windowClosed(WindowEvent e) {} public void windowDeactivated(WindowEvent e) {} public void windowDeiconified(WindowEvent e) {} public void windowIconified(WindowEvent e) {} public void windowOpened(WindowEvent e) {} public void windowClosing(WindowEvent e) {System.exit(0);} }
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