memorymanagement.java

操作系统中内存管理页面置换算法的模拟程序

// The main MemoryManagement program

import java.applet.*;
import java.awt.*;
import java.io.*;
import java.util.*;
import ControlPanel;
import PageFault;
import Virtual2Physical;
import Common;
import Page;

public class MemoryManagement 
{
  public static void main(String[] args) 
  {
    ControlPanel controlPanel;
    Kernel kernel;

    if ( args.length < 1 || args.length > 2 ) 
    {
      System.out.println( "Usage: 'java MemoryManagement <COMMAND FILE> <PROPERTIES FILE>'" );
      System.exit( -1 );
    } 

    File f = new File( args[0] );

    if ( ! ( f.exists() ) ) 
    {
      System.out.println( "MemoryM: error, file '" + f.getName() + "' does not exist." );
      System.exit( -1 );
    }
    if ( ! ( f.canRead() ) ) 
    {
      System.out.println( "MemoryM: error, read of " + f.getName() + " failed." );
      System.exit( -1 );
    }

    if ( args.length == 2 ) 
    {
      f = new File( args[1] );

      if ( ! ( f.exists() ) ) 
      {
        System.out.println( "MemoryM: error, file '" + f.getName() + "' does not exist." );
        System.exit( -1 );
      }
      if ( ! ( f.canRead() ) ) 
      {
        System.out.println( "MemoryM: error, read of " + f.getName() + " failed." );
        System.exit( -1 );
      } 
    }

    kernel = new Kernel();
    controlPanel = new ControlPanel( "Memory Management" );
    if ( args.length == 1 ) 
    {
      controlPanel.init( kernel , args[0] , null );
    }
    else
    {
      controlPanel.init( kernel , args[0] , args[1] );
    }
  }
}