实验四-模拟操作系统内存管理

实验四模拟操作系统内存管理本程序可分配,撤消进程,动态显示内存占用情况．运行如图示：代码如下：importjava.awt.*;importjava.awt.event.*;importjavax.swing.*;/*主程序类*/publicclassMemoryextendsJFrameimplementsActionListener{//实现接口JFrameset_frame,fr;JButtonjbutton1,jbutton2,jbutton3,jbutton4,jbutton5,jbutton6;//声明进程JLabeljLabel1,jLabel2,jLabel3,jLabel4,thread_label1,thread_label2,lab1;//声明内存使用情况JTextPanejTextPane1,jTextPane2,thread_text;staticJTablejTable;JProgressBarjProgressBar;JPanelpel;finalString[]table_title={"分区号","大小〔K〕","起址〔K〕","状态"};staticObject[][]table_data=newObject[15][4];staticintfree_size=1000,use_size=0,num=0,thread_num;//初始化内存空间大小为1000，已用空间大小为0staticbooleanfind_flag=true;staticthreads[]thread_arry=newthreads[15];staticmemory_class[]memory_arry=newmemory_class[15];publicMemory(){super("实验五：可变分区方式的存储器管理");setSize(620,450);setLayout(null);setLocation(240,180);setResizable(false);jLabel1=newJLabel("内存的使用情况列表：");add(jLabel1);jLabel1.setBounds(20,20,200,25);//创立横坐标为20，纵坐标为20，长为200，宽为25的矩形。jTable=newJTable(table_data,table_title);jTable.setRowHeight(20);intv=ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;inth=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;JScrollPanescrollPane=newJScrollPane(jTable,v,h);JPanelcp=newJPanel();cp.setLayout(newBorderLayout());add(cp);cp.add(scrollPane,BorderLayout.CENTER);cp.setBounds(20,50,370,220);Stringstr1,str2;str1=0+"K";str2=1000+"K";jLabel2=newJLabel("已用的内存空间：");add(jLabel2);//将jLabel2加到集合中jLabel2.setBounds(440,20,200,25);//创立横坐标为440，纵坐标为20，长为200，宽为25的矩形。jTextPane1=newJTextPane();add(jTextPane1);jTextPane1.setBounds(440,55,100,30);jTextPane1.setEditable(false);jTextPane1.setText(str1);jLabel3=newJLabel("可用的内存空间：");add(jLabel3);jLabel3.setBounds(440,115,200,25);jTextPane2=newJTextPane();add(jTextPane2);jTextPane2.setBounds(440,150,100,30);jTextPane2.setEditable(false);jTextPane2.setText(str2);jLabel4=newJLabel("内存总的使用情况：");add(jLabel4);jLabel4.setBounds(440,210,200,25);jProgressBar=newJProgressBar();add(jProgressBar);jProgressBar.setBackground(Color.white);//设置背景图片，为白色jProgressBar.setMaximum(1000);//设置组件大小为1000jProgressBar.setStringPainted(true);//设置进度条，进度默认用百分比表示。jProgressBar.setBounds(440,245,150,20);jbutton1=newJButton("创建进程");add(jbutton1);jbutton1.addActionListener(this);//给jButton1添加一个事件侦听器，当jButton被按下的时候，所需要发生的事情定义在newPlusCaculator_btnCaculate_actionAdapter(this)里。jbutton1.setBounds(50,310,120,30);jbutton1.setCursor(newCursor(12));jbutton2=newJButton("撤消进程");add(jbutton2);jbutton2.addActionListener(this);jbutton2.setBounds(250,310,120,30);jbutton2.setCursor(newCursor(12));jbutton3=newJButton("退出程序");add(jbutton3);jbutton3.addActionListener(this);jbutton3.setBounds(440,310,120,30);jbutton3.setCursor(newCursor(12));setVisible(true);addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){System.exit(0);}});}publicvoidactionPerformed(ActionEvente){if(e.getSource()==jbutton1){if(free_size>0){add_thread();if(thread_arry[num-1].thread_size<=free_size){memory_class.find_free_memory();if(find_flag==true){set_table();jTable.repaint();free_size=0;use_size=0;set_text();jProgressBar.setValue(use_size);}elseif(find_flag==false){notice("find");}}else{num--;notice("free");//去掉多余}}else{notice("mem");}}elseif(e.getSource()==jbutton2){destroy_thread_frame();}elseif(e.getSource()==jbutton3){System.exit(0);}elseif(e.getSource()==jbutton4){thread_num=Integer.parseInt(thread_text.getText());destroy_thread();set_frame.setVisible(false);}elseif(e.getSource()==jbutton5){set_frame.setVisible(false);}elseif(e.getSource()==jbutton6){fr.setVisible(false);}}/*用于添加进程的方法*/publicvoidadd_thread(){thread_arry[num]=newthreads();memory_arry[num+1]=newmemory_class();num++;}/*设置文本框的值*/publicvoidset_text(){Stringstr1,str2;for(intj=0;j<num;j++){if(memory_arry[j].use_flag==true){use_size+=memory_arry[j].size;}}for(inti=0;i<=num;i++){if(memory_arry[i].use_flag==false){free_size+=memory_arry[i].size;}}str1=use_size+"K";str2=free_size+"K";jTextPane1.setText(str1);jTextPane2.setText(str2);}/*设置表格*/publicstaticvoidset_table(){for(intj=1;j<=num;j++){ints=0;for(intn=0;n<j;n++){s+=memory_arry[n].size;}memory_arry[j].start_address=s+1;}for(inti=0;i<=num;i++){table_data[i][0]=memory_arry[i].mem_num;table_data[i][1]=memory_arry[i].size;table_data[i][2]=memory_arry[i].start_address;if(Memory.memory_arry[i].use_flag==true){table_data[i][3]=memory_arry[i].thread_use+"号进程占用";}elseif(memory_arry[i].use_flag==false){table_data[i][3]="可用";}jTable.repaint();}}/*撤消进程的窗口*/publicvoiddestroy_thread_frame(){set_frame=newJFrame("撤消进程");set_frame.setSize(300,150);set_frame.setLayout(null);set_frame.setLocation(370,330);set_frame.setResizable(false);thread_label1=newJLabel("请输入想要撤消的进程编号：");set_frame.add(thread_label1);thread_label1.setBounds(20,20,180,25);thread_text=newJTextPane();set_frame.add(thread_text);thread_text.setBounds(200,20,30,20);thread_label2=newJLabel("号进程");set_frame.add(thread_label2);thread_label2.setBounds(230,20,150,25);jbutton4=newJButton("确定");set_frame.add(jbutton4);jbutton4.addActionListener(this);jbutton4.setBounds(50,70,80,30);jbutton4.setCursor(newCursor(12));jbutton5=newJButton("取消");set_frame.add(jbutton5);jbutton5.addActionListener(this);jbutton5.setBounds(160,70,80,30);jbutton5.setCursor(newCursor(12));set_frame.setVisible(true);}/*撤消进程的方法*/publicvoiddestroy_thread(){for(intn=0;n<=num;n++){if(memory_arry[n].thread_use==thread_num){if(memory_arry[n-1].use_flag==false){/*如果前面分区为空，与前面的分区合并*/memory_arry[n-1].size+=memory_arry[n].size;intna=n;for(intx=n;x<num;x++){memory_arry[x]=memory_arry[x+1];memory_arry[x].mem_num=na;na++;}table_data[num][0]="";jTable.repaint();}elseif(memory_arry[n+1].use_flag==false){/*如果后面分区为空，与后面的分区合并*/memory_arry[n].size+=memory_arry[n+1].size;intna=n+1;for(intx=n+1;x<num;x++){memory_arry[x]=memory_arry[x+1];memory_arry[x].mem_num=na;na++;}}elseif(memory_arry[n+1].use_flag==false&&memory_arry[n-1].use_flag==false){/*如果前后的分区都为空，与前后的分区合并*/memory_arry[n-1].size=memory_arry[n-1].size+memory_arry[n].size+memory_arry[n+1].size;intna=n;for(intx=n;x<num;x++){memory_arry[x]=memory_arry[x+2];memory_arry[x].mem_num=na;na++;}}else{memory_arry[n].use_flag=false;}}}Memory.set_table();}/*错误提示信息窗口*/publicvoidnotice(Stringsuccess){load_imageimage_notice;fr=newJFrame("注意");fr.setSize(530,150);fr.setLayout(null);fr.setLocation(260,280);fr.setResizable(false);if(success=="mem"){lab1=newJLabel("系统内存的容量已用完，请撒消某些进程！");fr.add(lab1);lab1.setBounds(130,35,400,25);}elseif(success=="free"){lab1=newJLabel("系统内存的容量缺乏，请撒消某些进程！");fr.add(lab1);lab1.setBounds(130,35,400,25);}elseif(success=="find"){lab1=newJLabel("找不到适宜的空闲分区，请撒消某些进程！");fr.add(lab1);lab1.setBounds(130,35,400,25);}image_notice=newload_image("false");pel=newJPanel();pel.setLayout(newBorderLayout());pel.add(image_notice,BorderLayout.CENTER);fr.add(pel);pel.setBounds(15,10,100,100);jbutton6=newJButton("确定");fr.add(jbutton6);jbutton6.setBounds(410,35,90,30);jbutton6.addActionListener(this);jbutton3.setCursor(newCursor(12));fr.setVisible(true);}publicstaticvoidmain(Stringargs[]){Memorymain_obj=newMemory();memory_arry[0]=newmemory_class();memory_arry[0].set_start();table_data[0][0]=""+0;table_data[0][1]=""+1000;table_data[0][2]=""+0;table_data[0][3]=""+"可用";}}/*------------------------------------------------------------------------------------*//*进程类*/classthreads{intthread_number,thread_size;booleanstate=false,run_flag=false;/*线程类的构造函数*/publicthreads(){this.thread_number=Memory.num;this.thread_size=(int)(Math.random()*400);}}/*用于加载图片的类*/classload_imageextendsCanvas{Toolkittool;Imagemyimage;publicload_image(Stringpicture){setSize(200,200);tool=getToolkit();myimage=tool.getImage("false.jpg");}publicvoidpaint(Graphicsg){g.drawImage(myimage,10,10,myimage.getWidth(this),myimage.getHeight(this),this);}}/*内存类*/classmemory_class{intmem_num;intsize,start_address,thread_use;publicbooleanuse_flag=false;memory_class(){this.mem_num=Memory.num;}publicvoidset_start(){this.size=1000;this.start_address=0;this.mem_num=0;}/*查找适合某进程的空闲分区*/publicstaticvoidfind_free_memory(){memory_classchange_obj=newmemory_class();for(inti=0;i<Memory.num;i++){if(Memory.memory_arry[i].size<Memory.thread_arry[Memory.num-1].thread_size&&Memory.memory_arry[i].use_flag==false){Memory.find_flag=false;}elseif(Memory.memory_arry[i].size==Memory.thread_arry[Memory.num-1].thread_size&&Memory.memory_arry[i].use_flag==false){Memory.memory_arry[i].use_flag=true;Memory.memory_arry[i].thread_use=Memory.thread_arry[Memory.num-1].thread_number;