GUI_通过鼠标移动到按钮上更改背景色案例

小灰灰 2022-06-18 06:23 123阅读 0赞

package cn.itcast_06;
    
    import java.awt.Button;
    import java.awt.Color;
    import java.awt.FlowLayout;
    import java.awt.Frame;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.FocusAdapter;
    import java.awt.event.FocusEvent;
    import java.awt.event.FocusListener;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import java.awt.event.WindowAdapter;
    import java.awt.event.WindowEvent;
    
    public class FrameDemo {
    	public static void main(String[] args) {
    		// 创建窗体对象
    		final Frame f = new Frame("更改背景颜色");
    		// 设置属性及布局
    		f.setBounds(400, 200, 400, 300);
    		f.setLayout(new FlowLayout());
    
    		// 创建按钮对象
    		Button redButton = new Button("红色");
    		Button greenButton = new Button("绿色");
    		Button blueButton = new Button("蓝色");
    		Button whiteButton = new Button("复原");
    
    		// 添加按钮
    		f.add(redButton);
    		f.add(greenButton);
    		f.add(blueButton);
    		f.add(whiteButton);
    
    		// 对按钮添加动作事件
    		// redButton.addActionListener(new ActionListener() {
    		//
    		// @Override
    		// public void actionPerformed(ActionEvent e) {
    		// f.setBackground(Color.RED);
    		// }
    		// });
    
    		// 对按钮添加鼠标点击事件
    		// redButton.addMouseListener(new MouseAdapter() {
    		// @Override
    		// public void mouseClicked(MouseEvent e) {
    		// f.setBackground(Color.RED);
    		// }
    		// });
    
    		// 对按钮添加鼠标的进入事件
    		redButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseEntered(MouseEvent e) {
    				f.setBackground(Color.RED);
    			}
    
    			// @Override
    			// public void mouseExited(MouseEvent e) {
    			// f.setBackground(Color.WHITE);
    			// }
    		});
    		greenButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseEntered(MouseEvent e) {
    				f.setBackground(Color.GREEN);
    			}
    
    			// @Override
    			// public void mouseExited(MouseEvent e) {
    			// f.setBackground(Color.WHITE);
    			// }
    		});
    		blueButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseEntered(MouseEvent e) {
    				f.setBackground(Color.BLUE);
    			}
    
    			// @Override
    			// public void mouseExited(MouseEvent e) {
    			// f.setBackground(Color.WHITE);
    			// }
    		});
    		whiteButton.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseEntered(MouseEvent e) {
    				f.setBackground(Color.WHITE);
    			}
    
    			// @Override
    			// public void mouseExited(MouseEvent e) {
    			// f.setBackground(Color.WHITE);
    			// }
    		});
    
    		// 设置关闭窗体
    		f.addWindowListener(new WindowAdapter() {
    			@Override
    			public void windowClosing(WindowEvent e) {
    				System.exit(0);
    			}
    		});
    
    		// 设置窗体可见
    		f.setVisible(true);
    	}
    }