内存的分配与回收

一、        实验目的

用高级语言完成一个主存空间的分配和回收程序，以加深对动态分区分配方式及其算法的理解。

二、        实验内容和要求

采用连续分配方式之动态分区分配存储管理，使用首次适应算法、循环首次适应算法、最佳适应算法和最坏适应算法4种算法完成设计(任选两种算法)。

（1）**设计一个作业申请队列以及作业完成后的释放顺序，实现主存的分配和回收。采用分区说明表进行。

（2）或在程序运行过程，由用户指定申请与释放。

（3）设计一个空闲区说明表，以保存某时刻主存空间占用情况。把空闲区说明表的变化情况以及各作业的申请、释放情况显示。

三、        实验方法、步骤及结果测试

1. 1.      原理分析及流程图

        程序名：best.rar

1. 2.      步骤：

  创建项目：best

  创建包：best

  创建类：bestFit.java 、firstFit.java、 MainFrame.java

  编写代码

1. 3.      主要程序段及其解释

    

package best;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.border.EtchedBorder;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import java.awt.Color;
import javax.swing.SwingConstants;
import javax.swing.JTextField;
public class bestFit extends JFrame {
    private JPanel contentPane;
    private JTextField everySize;
    private JTextField workname;
    private JTextField count;
    private JFrame frame;
    private JTextField location;
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    bestFit frame = new bestFit();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
    /** * Create the frame. */
    class pointer
    {
        public int prepointer;
        public int nextpoint;
        public int length;
        public int signal;
        pointer()
        {
            prepointer=0;
            nextpoint=0;
            length=0;
            signal=0;
        }
    }
    public bestFit() {
        setTitle("");
        setResizable(false);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setBounds(300, 200, 559, 447);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        JPanel panel = new JPanel();
        panel.setLayout(null);
        panel.setBorder(new EtchedBorder(EtchedBorder.LOWERED, Color.DARK_GRAY, Color.PINK));
        panel.setBounds(10, 10, 324, 399);
        contentPane.add(panel);
        JLabel label = new JLabel("模拟内存");
        label.setHorizontalAlignment(SwingConstants.CENTER);
        label.setForeground(Color.GRAY);
        label.setFont(new Font("微软雅黑", Font.BOLD, 18));
        label.setBounds(64, 0, 118, 36);
        panel.add(label);
        JPanel panel_1 = new JPanel();
        panel_1.setLayout(null);
        panel_1.setBorder(new EtchedBorder(EtchedBorder.LOWERED, Color.BLACK, Color.DARK_GRAY));
        panel_1.setBounds(99, 50, 176, 312);
        panel.add(panel_1);
        JPanel one = new JPanel();
        one.setLayout(null);
        one.setBorder(new EtchedBorder(EtchedBorder.RAISED, Color.BLACK, null));
        one.setBounds(0, 0, 176, 54);
        panel_1.add(one);
        JPanel two = new JPanel();
        two.setLayout(null);
        two.setBorder(new EtchedBorder(EtchedBorder.RAISED, new Color(0, 0, 0), null));
        two.setBounds(0, 54, 176, 104);
        panel_1.add(two);
        JPanel three = new JPanel();
        three.setLayout(null);
        three.setBorder(new EtchedBorder(EtchedBorder.RAISED, Color.BLACK, null));
        three.setBounds(0, 158, 176, 154);
        panel_1.add(three);
        JLabel label_1 = new JLabel("50KB");
    label_1.setHorizontalAlignment(SwingConstants.CENTER);
        label_1.setFont(new Font("微软雅黑", Font.BOLD, 14));
        label_1.setBounds(270, 68, 54, 19);
        panel.add(label_1);
        JLabel label_2 = new JLabel("100KB");
    label_2.setHorizontalAlignment(SwingConstants.CENTER);
        label_2.setFont(new Font("微软雅黑", Font.BOLD, 14));
        label_2.setBounds(270, 144, 54, 19);
        panel.add(label_2);
        JLabel label_3 = new JLabel("150KB");
    label_3.setHorizontalAlignment(SwingConstants.CENTER);
        label_3.setFont(new Font("微软雅黑", Font.BOLD, 14));
        label_3.setBounds(270, 292, 54, 19);
        panel.add(label_3);
        JPanel panel_5 = new JPanel();
        panel_5.setLayout(null);
        panel_5.setBorder(new EtchedBorder(EtchedBorder.LOWERED, Color.DARK_GRAY, Color.PINK));
        panel_5.setBounds(344, 10, 199, 399);
        contentPane.add(panel_5);
        JButton back = new JButton("回收进程");
        back.setFont(new Font("微软雅黑", Font.BOLD, 15));
        back.setBounds(49, 316, 132, 34);
        panel_5.add(back);
        JLabel label_4 = new JLabel("进程大小");
        label_4.setOpaque(true);
    label_4.setHorizontalAlignment(SwingConstants.CENTER);
        label_4.setForeground(Color.GRAY);
        label_4.setFont(new Font("微软雅黑", Font.BOLD, 15));
        label_4.setBounds(15, 119, 65, 27);
        panel_5.add(label_4);
        everySize = new JTextField();
    everySize.setHorizontalAlignment(SwingConstants.CENTER);
        everySize.setFont(new Font("微软雅黑", Font.BOLD, 15));
        everySize.setColumns(10);
        everySize.setBounds(91, 121, 65, 21);
        panel_5.add(everySize);
        JLabel label_5 = new JLabel("进程名");
        label_5.setOpaque(true);
    label_5.setHorizontalAlignment(SwingConstants.CENTER);
        label_5.setForeground(Color.GRAY);
        label_5.setFont(new Font("微软雅黑", Font.BOLD, 15));
        label_5.setBounds(15, 64, 65, 27);
        panel_5.add(label_5);
        workname = new JTextField();
        workname.setHorizontalAlignment(SwingConstants.CENTER);
        workname.setFont(new Font("微软雅黑", Font.BOLD, 15));
        workname.setColumns(10);
        workname.setBounds(91, 66, 65, 21);
        panel_5.add(workname);
        JLabel label_6 = new JLabel("KB");
    label_6.setHorizontalAlignment(SwingConstants.CENTER);
        label_6.setForeground(Color.GRAY);
        label_6.setFont(new Font("微软雅黑", Font.BOLD, 15));
        label_6.setBounds(155, 122, 26, 21);
        panel_5.add(label_6);
        JButton startbutton = new JButton("开始分配");
        startbutton.setFont(new Font("微软雅黑", Font.BOLD, 15));
        startbutton.setBounds(49, 178, 132, 34);
        panel_5.add(startbutton);
        JButton restartbutton = new JButton("重新开始");
        restartbutton.setFont(new Font("微软雅黑", Font.BOLD, 15));
        restartbutton.setBounds(49, 245, 132, 34);
        panel_5.add(restartbutton);
        count = new JTextField();
        count.setText("0");
        count.setEnabled(false);
        count.setEditable(false);
        count.setColumns(10);
        count.setBounds(72, 253, 19, 15);
        panel_5.add(count);
        count.setVisible(false);
        location = new JTextField();
        location.setEditable(false);
        location.setEnabled(false);
        location.setText("0");
        location.setBounds(72, 324, 66, 21);
        panel_5.add(location);
        location.setColumns(10);
        location.setVisible(false);
        final JLabel name[]=new JLabel[20];
        for(int i=0;i<20;i++)
        {
            name[i]=new JLabel();
            name[i].setFont(new Font("微软雅黑",Font.BOLD,12));
    name[i].setHorizontalAlignment(SwingConstants.CENTER);
            panel.add(name[i]);
        }
        final JLabel blocks[]=new JLabel[300];
        for(int i=0;i<50;i++)
        {
            blocks[i] = new JLabel("");
            blocks[i].setOpaque(false);
            one.add(blocks[i]);
        }
        for(int i=50;i<150;i++)
        {
            blocks[i] = new JLabel("");
            blocks[i].setOpaque(false);
            two.add(blocks[i]);
        }
        for(int i=150;i<300;i++)
        {
            blocks[i] = new JLabel("");
            blocks[i].setOpaque(false);
            three.add(blocks[i]);
        }
        //设置前指针和后指针，以及空闲区的初始长度
        final pointer pt[]=new pointer[3];
        for(int i=0;i<3;i++)
        {
            pt[i]=new pointer();
        }
        pt[0].prepointer=0;
        pt[0].nextpoint=50;
        pt[0].length=50;
        pt[0].signal=0;
        pt[1].prepointer=50;
        pt[1].nextpoint=150;
        pt[1].length=100;
        pt[1].signal=0;
        pt[2].prepointer=150;
        pt[2].nextpoint=300;
        pt[2].length=150;
        pt[2].signal=0;
        startbutton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String str=everySize.getText();
                int size=Integer.parseInt(str);
                String str1=count.getText();
                int num=Integer.parseInt(str1);
                String str2=workname.getText();

                int i;            
                for(i=0;i<3;i++)
                {
                    if(pt[i].length>size)
                    {
                        break;
                    }
                }
                if(i==3)
                {
                    JOptionPane.showMessageDialog(frame, "没有合适的空闲分区！", null, JOptionPane.WARNING_MESSAGE);
                }
                    else
                    {
                        int sig=min(pt[0].length,pt[1].length,pt[2].length,size);
                        for(int j=0;j<size;j++)            
                        {
                            if(pt[sig].prepointer<50)
                            {
blocks[j+pt[sig].prepointer].setBounds(2, j+2+pt[sig].prepointer, 172, 1);
blocks[j+pt[sig].prepointer].setBackground(new Color(250,0,0));                    blocks[j+pt[sig].prepointer].setOpaque(true);
    }                            if(pt[sig].prepointer<150&&pt[sig].prepointer>=50)                            {
                blocks[j+pt[sig].prepointer].setBounds(2, j+2+pt[sig].prepointer-50, 172, 1);
                    blocks[j+pt[sig].prepointer].setBackground(new Color(0,250,0));                                blocks[j+pt[sig].prepointer].setOpaque(true);        
                            }
            if(pt[sig].prepointer<300&&pt[sig].prepointer>=150)
                            {                                blocks[j+pt[sig].prepointer].setBounds(2, j+2+pt[sig].prepointer-150, 172, 1);
    blocks[j+pt[sig].prepointer].setBackground(new Color(0,0,250));                                blocks[j+pt[sig].prepointer].setOpaque(true);
                    }                                                
                }                    pt[sig].prepointer=pt[sig].prepointer+size;
        pt[sig].length=pt[sig].length-size;               
       name[num].setText(str2+" "+size+"KB");
name[num].setBounds(10, pt[sig].prepointer+50-size, 79, 15);
                        num++;
                        count.setText(num+"");
                    }                    
            }
        });
        restartbutton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                pt[0].prepointer=0;
                pt[0].nextpoint=50;
                pt[0].length=50;
                pt[0].signal=0;
                pt[1].prepointer=50;
                pt[1].nextpoint=150;
                pt[1].length=100;
                pt[1].signal=0;
                pt[2].prepointer=150;
                pt[2].nextpoint=300;
                pt[2].length=150;
                pt[2].signal=0;
                for(int i=0;i<300;i++)
                {
                    blocks[i].setOpaque(false);
                    blocks[i].setBackground(new Color(240,240,240));
                }
                everySize.setText("");
                for(int i=0;i<20;i++)
                {
                    name[i].setText("");
                }
                workname.setText("");
            }
        });
        back.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String str2=workname.getText();
                System.out.println(str2);
                if(str2.equals("1")==true){
                    System.out.println("haha");
                    pt[0].prepointer=0;
                    pt[0].nextpoint=50;
                    pt[0].length=50;
                    pt[0].signal=0; 
                    for(int i=0;i<50;i++)
                    {
                        blocks[i].setOpaque(false);
                        blocks[i].setBackground(new Color(240,240,240));
                    }
                    name[0].setText("");
                }
                if(str2.equals("3")==true){
                    System.out.println("haha");
                    pt[2].prepointer=150;
                    pt[2].nextpoint=300;
                    pt[2].length=150;
                    pt[2].signal=0;
                    for(int i=150;i<300;i++)
                    {
                        blocks[i].setOpaque(false);
                        blocks[i].setBackground(new Color(240,240,240));
                    }
                    name[2].setText("");
                }
                if(str2.equals("2")==true){
                    System.out.println("haha");
                    pt[1].prepointer=50;
                    pt[1].nextpoint=150;
                    pt[1].length=100;
                    pt[1].signal=0;
                    for(int i=50;i<150;i++)
                    {
                        blocks[i].setOpaque(false);
                        blocks[i].setBackground(new Color(240,240,240));
                    }
                    name[1].setText("");
                }
            }
        });
    }
    int min(int a,int b,int c,int d)
    {
        int n1=a-d;
        int n2=b-d;
        int n3=c-d;
        if(n1<0)
        {
            if(n2<0)
            {
                return 2;
            }
            else
            {
                if(n3<0)
                {
                    return 3;
                }
                else
                {
                    if(n2<=n3)
                    {
                        return 1;
                    }
                    else
                    {
                        return 2;
                    }
                }
            }
        }
        else
        {
            if(n2<0)
            {
                if(n3<0)
                {
                    return 0;
                }
                else
                {
                    if(n1<=n3)
                    {
                        return 0;
                    }
                    else
                    {
                        return 2;
                    }
                }
            }
            else
            {
                if(n3<0)
                {
                    if(n1<=n2)
                    {
                        return 0;
                    }
                    else
                    {
                        return 1;
                    }
                }
                else
                {
                    if(n1<=n2)
                    {
                        if(n1<=n3)
                        {
                            return 0;
                        }
                        else
                        {
                            return 2;
                        }
                    }
                    else
                    {
                        if(n2<=n3)
                        {
                            return 1;
                        }
                        else
                        {
                            return 0;
                        }
                    }
                }
            }
        }
    }
}
//首次适应算法
package best;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import java.awt.Font;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import java.awt.Color;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.ImageIcon;
import java.awt.event.ContainerAdapter;
import java.awt.event.ContainerEvent;
import javax.swing.border.EtchedBorder;
class pointer
{
    public int prepointer;
    public int nextpoint;
    public int length;
    public int signal;
    pointer()
    {
        prepointer=0;
        nextpoint=0;
        length=0;
        signal=0;
    }
}
public class firstFit extends JFrame {
    private JPanel contentPane;
    private JTextField everySize;
    private JFrame frame;
    private JTextField workname;
    private JTextField count;
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    firstFit frame = new firstFit();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
    /**
     * Create the frame.
     */
    public firstFit() {
        setResizable(false);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setBounds(300, 200, 559, 447);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        JPanel panel = new JPanel();
        panel.setBorder(new EtchedBorder(EtchedBorder.LOWERED, Color.DARK_GRAY, Color.PINK));
        panel.setBounds(344, 10, 199, 399);
        contentPane.add(panel);
        panel.setLayout(null);
        JLabel label = new JLabel("进程大小");
        label.setHorizontalAlignment(SwingConstants.CENTER);
        label.setForeground(Color.GRAY);
        label.setFont(new Font("微软雅黑", Font.BOLD, 15));
        label.setBounds(15, 119, 65, 27);
        panel.add(label);
        label.setOpaque(true);
        everySize = new JTextField();
        everySize.setHorizontalAlignment(SwingConstants.CENTER);
        everySize.setFont(new Font("微软雅黑", Font.BOLD, 15));
        everySize.setColumns(10);
        everySize.setBounds(91, 121, 65, 21);
        panel.add(everySize);
        JLabel label_2 = new JLabel("进程名称");
        label_2.setOpaque(true);
        label_2.setHorizontalAlignment(SwingConstants.CENTER);
        label_2.setForeground(Color.GRAY);
        label_2.setFont(new Font("微软雅黑", Font.BOLD, 15));
        label_2.setBounds(15, 64, 65, 27);
        panel.add(label_2);
        workname = new JTextField();
        workname.setHorizontalAlignment(SwingConstants.CENTER);
        workname.setFont(new Font("微软雅黑", Font.BOLD, 15));
        workname.setColumns(10);
        workname.setBounds(91, 66, 65, 21);
        panel.add(workname);
        JLabel label_1 = new JLabel("KB");
        label_1.setHorizontalAlignment(SwingConstants.CENTER);
        label_1.setForeground(Color.GRAY);
        label_1.setFont(new Font("微软雅黑", Font.BOLD, 15));
        label_1.setBounds(155, 122, 26, 21);
        panel.add(label_1);
        JPanel panel_1 = new JPanel();
        panel_1.setBorder(new EtchedBorder(EtchedBorder.LOWERED, Color.DARK_GRAY, Color.PINK));
        panel_1.setBounds(10, 10, 324, 399);
        contentPane.add(panel_1);
        panel_1.setLayout(null);
        JLabel lblNewLabel_2 = new JLabel("模拟内存");
        lblNewLabel_2.setForeground(Color.GRAY);
        lblNewLabel_2.setHorizontalAlignment(SwingConstants.CENTER);
        lblNewLabel_2.setFont(new Font("微软雅黑", Font.BOLD, 18));
        lblNewLabel_2.setBounds(64, 0, 118, 36);
        panel_1.add(lblNewLabel_2);
        JPanel panel_2 = new JPanel();
        panel_2.setBorder(new EtchedBorder(EtchedBorder.LOWERED, Color.BLACK, Color.DARK_GRAY));
        panel_2.setBounds(99, 50, 176, 312);
        panel_1.add(panel_2);
        panel_2.setLayout(null);
        final JPanel one = new JPanel();
        one.setBorder(new EtchedBorder(EtchedBorder.RAISED, Color.BLACK, null));
        one.setBounds(0, 0, 176, 54);
        panel_2.add(one);
        one.setLayout(null);
        JPanel two = new JPanel();
        two.setBorder(new EtchedBorder(EtchedBorder.RAISED, new Color(0, 0, 0), null));
        two.setBounds(0, 54, 176, 104);
        panel_2.add(two);
        two.setLayout(null);
        JPanel three = new JPanel();
        three.setBorder(new EtchedBorder(EtchedBorder.RAISED, Color.BLACK, null));
        three.setBounds(0, 158, 176, 154);
        panel_2.add(three);
        three.setLayout(null);
        final JLabel sizelabel = new JLabel("50KB");
        sizelabel.setHorizontalAlignment(SwingConstants.CENTER);
        sizelabel.setFont(new Font("微软雅黑", Font.BOLD, 14));
        sizelabel.setBounds(270, 68, 54, 19);
        panel_1.add(sizelabel);
        JLabel lblkb = new JLabel("100KB");
        lblkb.setHorizontalAlignment(SwingConstants.CENTER);
        lblkb.setFont(new Font("微软雅黑", Font.BOLD, 14));
        lblkb.setBounds(270, 144, 54, 19);
        panel_1.add(lblkb);
        JLabel lblkb_1 = new JLabel("150KB");
        lblkb_1.setHorizontalAlignment(SwingConstants.CENTER);
        lblkb_1.setFont(new Font("微软雅黑", Font.BOLD, 14));
        lblkb_1.setBounds(270, 292, 54, 19);
        panel_1.add(lblkb_1);
        final JLabel name[]=new JLabel[20];
        for(int i=0;i<20;i++)
        {
            name[i]=new JLabel();
            name[i].setFont(new Font("微软雅黑",Font.BOLD,12));
            name[i].setHorizontalAlignment(SwingConstants.CENTER);
            panel_1.add(name[i]);
        }
        final JLabel blocks[]=new JLabel[300];
        for(int i=0;i<50;i++)
        {
            blocks[i] = new JLabel("");
            blocks[i].setOpaque(false);
            one.add(blocks[i]);
        }
        for(int i=50;i<150;i++)
        {
            blocks[i] = new JLabel("");
            blocks[i].setOpaque(false);
            two.add(blocks[i]);
        }
        for(int i=150;i<300;i++)
        {
            blocks[i] = new JLabel("");
            blocks[i].setOpaque(false);
            three.add(blocks[i]);
        }
        //设置前指针和后指针，以及空闲区的初始长度
        final pointer pt[]=new pointer[3];
        for(int i=0;i<3;i++)
        {
            pt[i]=new pointer();
        }
        pt[0].prepointer=0;
        pt[0].nextpoint=50;
        pt[0].length=50;
        pt[0].signal=0;
        pt[1].prepointer=50;
        pt[1].nextpoint=150;
        pt[1].length=100;
        pt[1].signal=0;
        pt[2].prepointer=150;
        pt[2].nextpoint=300;
        pt[2].length=150;
        pt[2].signal=0;
        final JButton restartbutton = new JButton("重新开始");
        final JButton startbutton = new JButton("开始分配");
        startbutton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String str=everySize.getText();
                int size=Integer.parseInt(str);
                String str1=count.getText();
                int num=Integer.parseInt(str1);
                String str2=workname.getText();
                int i;
                for(i=0;i<3;i++)
                {
                    if(pt[i].length<size||pt[i].signal==1)
                    {
                        continue;
                    }
                    else
                    {
                        for(int j=0;j<size;j++)            
                        {
                            if(pt[i].prepointer<50){
                                blocks[j+pt[i].prepointer].setBounds(2, j+2+pt[i].prepointer, 172, 1);
                                blocks[j+pt[i].prepointer].setBackground(new Color(250,0,0));
                                blocks[j+pt[i].prepointer].setOpaque(true);
                            }
                            if(pt[i].prepointer<150&&pt[i].prepointer>=50)
                            {
                                blocks[j+pt[i].prepointer].setBounds(2, j+2+pt[i].prepointer-50, 172, 1);
                                blocks[j+pt[i].prepointer].setBackground(new Color(0,250,0));
                                blocks[j+pt[i].prepointer].setOpaque(true);    
                            }
                            if(pt[i].prepointer<300&&pt[i].prepointer>=150)
                            {
                                blocks[j+pt[i].prepointer].setBounds(2, j+2+pt[i].prepointer-150, 172, 1);
                                blocks[j+pt[i].prepointer].setBackground(new Color(0,0,250));
                                blocks[j+pt[i].prepointer].setOpaque(true);    
                            }                                            
                        }
                        pt[i].prepointer=pt[i].prepointer+size;
                        pt[i].length=pt[i].length-size;
                        break;                        
                    }                    
                }                
                if(i==3)
                {JOptionPane.showMessageDialog(frame, "没有合适的空闲分区！", null, JOptionPane.WARNING_MESSAGE);}
                else
                {
                    name[num].setText(str2+" "+size+"KB");
                    name[num].setBounds(10, pt[i].prepointer+50-size, 79, 15);
                    num++;
                    count.setText(num+"");
                }
            }
        });
        startbutton.setFont(new Font("微软雅黑", Font.BOLD, 15));
        startbutton.setBounds(49, 178, 132, 34);
        panel.add(startbutton);        
        restartbutton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                pt[0].prepointer=0;
                pt[0].nextpoint=50;
                pt[0].length=50;
                pt[0].signal=0;
                pt[1].prepointer=50;
                pt[1].nextpoint=150;
                pt[1].length=100;
                pt[1].signal=0;
                pt[2].prepointer=150;
                pt[2].nextpoint=300;
                pt[2].length=150;
                pt[2].signal=0;
                for(int i=0;i<300;i++)
                {
                    blocks[i].setOpaque(false);
                    blocks[i].setBackground(new Color(240,240,240));
                }
                everySize.setText("");
                for(int i=0;i<20;i++)
                {
                    name[i].setText("");
                }
                workname.setText("");
            }
        });
        restartbutton.setFont(new Font("微软雅黑", Font.BOLD, 15));
        restartbutton.setBounds(49, 245, 132, 34);
        panel.add(restartbutton);
        count = new JTextField();
        count.setEditable(false);
        count.setText("0");
        count.setEnabled(false);
        count.setBounds(72, 253, 19, 15);
        panel.add(count);
        count.setColumns(10);
        count.setVisible(false);        
    }
}

四、实验总结

   一开始在写程序的时候理解错了，导致后面写回收的时候出现了许多问题，导致回收那些代码出现了一点错乱，最后只能整个模块去回收，导致程序不完整。

在编写界面的时候由于对java界面的知识点了解相对比较少，导致在制作界面过程中遇到不少难题，最后是通过上网搜索相关知识和向老师或者同学请教才能解决。