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Java Java 编程编程 实验报告实验报告 班级班级学号学号任课教师任课教师 姓名姓名成绩成绩 课程名称课程名称 Java 编程 实验时间实验时间 实验题目实验题目 实验内容实验内容 import java awt import java awt event ActionEvent import java awt event ActionListener import java awt image ImageObserver import javax swing public class Experiment13 1 extends JFrame implements ActionListener JMenuBar jmb null JMenu jm null JMenuItem jmi1 null JMenuItem jmi2 null JButton jb1 null JButton jb2 null JToolBar jtb null JLabel j1 null JLabel j2 null int type 0 Image i null Image j null MyPanel mp null public static void main String args TODO Auto generated method stub new Experiment13 1 public Experiment13 1 JLabel j1 new JLabel new ImageIcon getClass getResource fl1 png JLabel j2 new JLabel new ImageIcon getClass getResource fl2 png jmb new JMenuBar jm new JMenu 国旗 jmi1 new JMenuItem CHINA new ImageIcon getClass getResource f1 png jmi2 new JMenuItem US new ImageIcon getClass getResource f2 png jmi1 addActionListener this jmi1 setActionCommand 1 jmi2 addActionListener this jmi2 setActionCommand 2 jmi1 setToolTipText Select the CHINA flag to display jmi2 setToolTipText Select the US flag to display jm add jmi1 jm add jmi2 jmb add jm mp new MyPanel jb1 new JButton new ImageIcon getClass getResource f1 png jb2 new JButton new ImageIcon getClass getResource f2 png jb1 addActionListener this jb1 setActionCommand 3 jb2 addActionListener this jb2 setActionCommand 4 jb1 setToolTipText Select the CHINA flag to display jb2 setToolTipText Select the US flag to display jb1 setBorderPainted true jb2 setBorderPainted true jtb new JToolBar jtb setFloatable true jtb setBorder BorderFactory createLineBorder Color RED jtb setOrientation JToolBar VERTICAL jtb add jb1 jtb add jb2 this add jmb BorderLayout NORTH this add jtb BorderLayout EAST this add mp BorderLayout CENTER this setTitle FLAG this setSize 700 500 this setLocationRelativeTo null this setResizable false this setVisible true this setDefaultCloseOperation EXIT ON CLOSE this setLocationRelativeTo null i new ImageIcon getClass getResource fl1 png getImage j new ImageIcon getClass getResource fl2 png getImage public void setType int type this type type Override public void actionPerformed ActionEvent e TODO Auto generated method stub switch e getActionCommand charAt 0 case 1 case 3 this setType 1 this repaint break case 2 case 4 this setType 2 this repaint break class MyPanel ext