./主类MemoryGameimport javax.swing.*;import java.awt.*;import java.awt.event.*;import java.io.*;import java.util.LinkedList;public class MemoryGame extends JFrame implements ActionListener JMenuBar bar; JMenu menuGrade,menuResult,menuIcon; JMenuItem oneGradeItem,twoGradeItem,threeGradeItem; JMenuItem oneGradeResult,twoGradeResult,threeGradeResult; JMenuItem carImageIcon,animalImageIcon; File fileOneGrade,fileTwoGrade,fileThreeGrade,gradeFile; S