操作系统实验（模拟内存分配与回收java实现）.doc

操作系统实验（模拟内存分配与回收java实现）一 实验目的1 深刻理解内存的分配与回收的概念。2 掌握内存分配与回收问题，首次适应算法。二 实验设备PC机三 实验内容 在Java开发平台内存的分配与回收问题，首次适应算法。四 程序的主要代码 import java.awt.*;import javax.swing.*;import javax.swing.border.*;import java.awt.event.*;public class Memory extends JFrame protectedJTextFieldblank0,blank1,blank2,blank3,blank4,blank5,blank6,blank7,blank8,blank9,blank10,blank11; protected JTextArea blank12; protected JButton button1,button2,button3; int wh = new int10; int wh1 = new int10; int wh2 = new int10; public Memory() JPanel p1 = new JPanel(new GridLayout(3,2,5,2); p1.add(button1 = new JButton(申请(大小); p1.add(blank10 = new JTextField(3); p1.add(button2 = new JButton(释放(块号); p1.add(blank11 = new JTextField(3); p1.add(new JLabel(t内存分配情况); JPanel p2 = new JPanel(new GridLayout(2,1,2,2); p2.add(p1); p2.add(blank12 = new JTextArea(); JPanel p3 = new JPanel(new GridLayout(11,1,20,0); p3.add(new JLabel(内存容量为10); p3.add(blank0 = new JTextField(3); p3.add(blank1 = new JTextField(3); p3.add(blank2 = new JTextField(3); p3.add(blank3 = new JTextField(3); p3.add(blank4 = new JTextField(3); p3.add(blank5 = new JTextField(3); p3.add(blank6 = new JTextField(3); p3.add(blank7 = new JTextField(3); p3.add(blank8 = new JTextField(3); p3.add(blank9 = new JTextField(3); JPanel p4 = new JPanel(new BorderLayout(3,3); p4.add(p2,BorderLayout.WEST); p4.add(p3,BorderLayout.CENTER); JPanel p5 =new JPanel(new FlowLayout(); p5.add(p4); p5.add(button3 = new JButton(清空内存),BorderLayout.EAST); setLayout(new FlowLayout(FlowLayout.CENTER,10,20); this.getContentPane(). add(p5); Font font1 = new Font(SansSerif,Font.BOLD,16); blank10.setFont(font1); blank11.setFont(font1); blank12.setFont(font1); button1.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) int n = Integer.parseInt(blank10.getText();/进程块的大小 if(n 10 | n 0) JOptionPane.showMessageDialog(null,进程大小违规，请从新输入！); outer: /向内存中添加进程！ for(int i = 0;i 10; i+ ) if(whi = 0 & Sum(wh,i,n) = 0) wh1i = i; /存储起始地址 wh2i = n; /存储进程长度 for(int ss = i; ss (i+n); ss+) whss = 1; /找到合适位置，置1 colorr(); JOptionPane.showMessageDialog(null,成功分配到内存！); blank12.append(块号： + wh1i + 起始位置： + wh1i + 大小： + wh2i + n); break outer; if(i = 9) JOptionPane.showMessageDialog(null,内存不足，请等待.); break outer; ); button2.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) int m = Integer.parseInt(blank11.getText();/进程块的起始位置和长度 for(int ff = m; ff (m + wh2m); ff+) whff = 0; wh1m = 0; wh2m = 0; colorr(); blank12.setText(); for(int bb = 0; bb 10; bb+) if(wh2bb != 0) blank12.append(块号： + wh1bb + 起始位置： + wh1bb + 大小： + wh2bb + n); ); button3.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) for(int cc = 0; cc 10; cc+) whcc = 0; colorr(); blank10.setText(); blank11.setText(); blank12.setText(); ); /*判断内存空间是否足够*/ public int Sum( int pp, int mm, int k) int sum = 0; if(mm + k) = 10) for(int zz = mm; zz (mm+k); zz+) sum += ppzz; else sum = 1; return sum; /*内存与wh数组相对应*/ public void colorr() if(wh0=1) blank0.setBackground(Color.GREEN); else blank0.setBackground(Color.WHITE); if(wh1=1) blank1.setBackground(Color.GREEN); else blank1.setBackground(Color.WHITE); if(wh2=1) blank2.setBackground(Color.GREEN); else blank2.setBackground(Color.WHITE); if(wh3=1) blank3.setBackground(Color.GREEN); else blank3.setBackground(Color.WHITE); if(wh4=1) blank4.setBackground(Color.GREEN); else blank4.setBackground(Color.WHITE); if(wh5=1) blank5.setBackground(Color.GREEN); else blank5.setBackground(Color.WHITE); if(wh6=1) blank6.setBackground(Color.GREEN); else blank6.setBackground(Color.WHITE); if(wh7=1) blank7.setBackground(Color.GREEN); else blank7.setBackground(Color.WHITE); if(wh8=1) blank8.setBackground(Color.GREEN); else blank8.setBackground(Color.WHITE); if(wh9=1) blank9.setBackground(Color.GREEN); else blank9.setBackground(Color.WHITE); public static void main(String args) Memory frame = new Memory(); frame.setTitle(首次适应算法实验); frame.setSize(500,400); frame.setLoca