datasharewn_ex.java

刘艺编著的java教程的课本习题加例题代码 很有用哦！

class Sharevalue{ 
 private int value;
 private boolean empty=true;
 synchronized void putvalue(int v){
   value=value+v;
   empty=false;
   notify();
 }
 synchronized int getvalue(int v){
  while(empty)
   try{
    this.wait();
   }
   catch(InterruptedException e){
    System.out.println(e);
   }
  if(value-v>=0) 
    value=value-v;
  else{
     v=value;
     value=0;
     System.out.println("Empty");
  }
  empty=false;
   return v;
 }
 int total(){
  return value;
 }
}
class Put extends Thread{
 Sharevalue sv;
 int value;
 public Put(Sharevalue s,int v){
   sv=s;
   value=v;
 }
 public void run(){
  synchronized(sv){ 
   int n=sv.total();
   try{
     sleep(1);
   }
   catch(InterruptedException e){
     System.out.println(e);
   }
   sv.putvalue(value);
   System.out.println("Value: "+n+"   Put vlaue: "+value+"  Total value: "+sv.total());
  }
 }
}
class Get extends Thread{
 Sharevalue sv;
 int value;
 public Get(Sharevalue s,int v){
  sv=s; 
  value=v;
 }
 public void run(){
  synchronized(sv){
   int n=sv.total();
   try{
     sleep(1);
   }
   catch(InterruptedException e){
     System.out.println(e);
   }
   System.out.println("Value: "+n+"   Get  value: "+sv.getvalue(value)+"  Total value: "+sv.total());
  }
 }
}
public class DatashareWN_ex{
 public static void main(String args[]){
  Sharevalue sv=new Sharevalue();
  Put p1=new Put(sv,100);
  Put p2=new Put(sv,200);
  Get g=new Get(sv,50);
  p1.start();
  g.start();
  p2.start();
 }
}