实验8_图形界面程序设计

山西大学计算机与信息技术学院label.setForeground(Color.BLUE);panel2.add(label);add(panel2);add(panel);}private class OKActionListener implements ActionListener { public void actionPerformed(ActionEvent e) {if (label.getText() == "你好") {label.setText("再见");} else {label.setText("你好");}}}public static void main(String[] args) {ChangeGUI change = new ChangeGUI();change.setSize(200, 100);change.setVisible(true);change.setLocationRelativeTo(null);change.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}}运行结果贴图:图一2．编程包含一个文本框和一个文本区域，文本框内容改变时，将文本框中的内容显示在文本区域中；在文本框中按回车键时，清空文本区域的内容。

程序代码：import java.awt.Color;import java.awt.GridLayout;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.border.TitledBorder;}}public static void main(String[] args) {JFrame frame = new ShowText();}}运行结果贴图:图二3．编程包含一个复选按钮和一个普通按钮，复选按钮选中时，普通按钮的背景色为青色，未选中时为灰色。

程序代码：import java.awt.Color;import java.awt.GridLayout;import java.awt.event.ItemEvent;import java.awt.event.ItemListener;import javax.swing.JButton;import javax.swing.JCheckBox;import javax.swing.JFrame;import javax.swing.JPanel;public class ChangeButtonColor extends JFrame {/****/private static final long serialVersionUID = 1L;private JButton button;private JCheckBox checkBox;public ChangeButtonColor() {图三4．编程包含两个按钮和一个标签，将发生单击事件的按钮上的文本信息显示在标签中。

提示：关键代码如下：b1.addActionListener(new B1());b2.addActionListener(new B2());class B1 implements ActionListener {public void actionPerformed(ActionEvent e) {who.setText("Button 1");}}class B2 implements ActionListener {public void actionPerformed(ActionEvent e) {who.setText("Button 2");}}程序代码：import java.awt.Color;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;public class ShowButtonText extends JFrame {private JButton b1;private JButton b2;private JLabel label;public ShowButtonText() {super("显示选中按钮信息");setLayout(new GridLayout(2, 1));JPanel p1 = new JPanel();p1.setBackground(Color.PINK);label = new JLabel("标签");label.setSize(20, 10);label.setBackground(Color.BLUE);p1.add(label);add(p1);JPanel p2 = new JPanel();p2.setBackground(Color.PINK);b1 = new JButton("你好");b2 = new JButton("再见");ButtonListener b = new ButtonListener();b1.addActionListener(b);b2.addActionListener(b);p2.add(b1);p2.add(b2);add(p2);setSize(200, 200);setVisible(true);this.setLocationRelativeTo(null);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}private class ButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) {if (e.getSource() == b1)label.setText(b1.getText());else if (e.getSource() == b2)label.setText(b2.getText());}}public static void main(String[] args) {ShowButtonText s = new ShowButtonText();}}运行结果贴图:图四图五6．编程使用BorderLayout布局方式放置5个按钮。

程序代码：import java.awt.BorderLayout;import java.awt.Color;import javax.swing.JButton;import javax.swing.JFrame;public class TestBorderLayout extends JFrame { private JButton nButton = new JButton("北部");private JButton sButton = new JButton("南部");private JButton wButton = new JButton("西部");private JButton eButton = new JButton("东部");private JButton cButton = new JButton("中部");public TestBorderLayout() {setLayout(new BorderLayout(5, 5));add(nButton, BorderLayout.NORTH);add(sButton, BorderLayout.SOUTH);add(wButton, BorderLayout.WEST);add(eButton, BorderLayout.EAST);add(cButton, BorderLayout.CENTER);nButton.setBackground(Color.PINK);sButton.setBackground(Color.PINK);wButton.setBackground(Color.PINK);eButton.setBackground(Color.PINK);cButton.setBackground(Color.PINK);}public static void main(String[] args) {TestBorderLayout t = new TestBorderLayout();t.setSize(250, 200);t.setVisible(true);t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);t.setLocationRelativeTo(null);}}运行结果贴图:图六7. 编写程序，实现使用键盘上的上下左右箭头控制界面上图片的移动。

移动到边界时从界面另一侧出现。

移动过程中显示另一个图片，停止时恢复原来的图片。

程序代码：import java.awt.Color;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import javax.swing.ImageIcon;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;public class MoveImage extends JFrame {private ImageIcon oneIcon = new ImageIcon("image/happy.jpg");private ImageIcon twoIcon = new ImageIcon("image/hello.jpg");private JLabel label;JPanel p;public MoveImage() {super("Image Move");setSize(500, 500);setLocationRelativeTo(null);label = new JLabel(oneIcon);p = new JPanel();setContentPane(p);p.setLayout(null);this.addKeyListener(new PanelListener());label.setBounds(0, 0, 100, 100);p.add(label);p.setBackground(Color.PINK);setVisible(true);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}private class PanelListener implements KeyListener { public void keyPressed(KeyEvent e) {label.setIcon(twoIcon);int x = label.getX();int y = label.getY();int w = p.getWidth();int h = p.getHeight();if (e.getKeyCode() == KeyEvent.VK_UP) {--y;if (y <= 0)y = h;label.setBounds(x, y, 100, 100);} else if (e.getKeyCode() == KeyEvent.VK_DOWN) { ++y;if (y >= h)y = 0;label.setBounds(x, y, 100, 100);} else if (e.getKeyCode() == KeyEvent.VK_LEFT) { x--;if (x <= 0)x = w;label.setBounds(x, y, 100, 100);} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) { x++;if (x >= w)x = 0;label.setBounds(x, y, 100, 100);}}public void keyReleased(KeyEvent e) {if (e.getKeyCode() == KeyEvent.VK_UP|| e.getKeyCode() == KeyEvent.VK_DOWN|| e.getKeyCode() == KeyEvent.VK_LEFT|| e.getKeyCode() == KeyEvent.VK_RIGHT) label.setIcon(oneIcon);}public void keyTyped(KeyEvent e) {}}public static void main(String[] args) { MoveImage m = new MoveImage();}}运行结果贴图:图七。