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  1. package thread;
  2.  
  3. import java.util.ArrayList;
  4.  
  5. public class add extends Thread {
  6.  
  7. 	public static Object lock = new Object();
  8. 	private static ArrayList<Double> tmp = new ArrayList<Double>();	
  9. 	private static int Thread_Num = 4;
  10. 	private static int count = -1;
  11.  
  12. 	private static double allsum = 0;
  13. 	private static double limit = 10000000;
  14.  
  15.     public void run() { // override Thread's run()
  16.  
  17.     	int threadid;
  18.     	synchronized(lock) {
  19.     		threadid = ++count;
  20.     	}
  21.     	double sum = 0;
  22.  
  23.     	for(int i=threadid;i<limit;i=i+Thread_Num) {
  24.     		sum += tmp.get(i);
  25.     	}
  26.  
  27.     	synchronized(lock) {    	
  28.     		allsum += sum;
  29.     	}
  30.  
  31.         System.out.println("Thread" + threadid + " finish!");
  32.     }
  33.  
  34.     public static void main(String[] argv) {
  35.  
  36.     	double testsum = 0;
  37. 		for(int i=0;i<limit;i++) {
  38. 			tmp.add((double) 1);
  39. 			testsum = testsum + 1;			
  40. 		}
  41.     	double startTime = System.currentTimeMillis();   
  42.  
  43. 		Thread t[] = new Thread [Thread_Num];
  44.     	for(int i=0;i<Thread_Num;i++) {
  45.     		t[i] = new add();
  46.     		t[i].start();
  47.     	}   
  48.  
  49.  
  50.     	try {
  51.     		for(int i=0;i<Thread_Num;i++) {
  52.         		t[i].join();
  53.         	}
  54.         } catch (InterruptedException e) {}
  55.  
  56.     	System.out.println("right ans");
  57.     	System.out.println(testsum);
  58.  
  59.     	System.out.println("thread ans");
  60.     	System.out.println(allsum);
  61.  
  62.     	double endTime = System.currentTimeMillis(); 
  63.     	System.out.println("Time : " + (endTime-startTime));
  64.  
  65.  
  66.  
  67.     }
  68.  
  69.  
  70. }
  71.  
Compilation error #stdin compilation error #stdout 0s 0KB
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Standard input is empty
compilation info 
Main.java:5: class add is public, should be declared in a file named add.java
public class add extends Thread {
       ^
1 error
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Standard output is empty
https://ideone.com/hHYoX
language:
Java (HotSpot 12)
created:
13 years ago
visibility:
public

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