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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. public class main {
  8.     public static void Main(String[] args) throws InterruptedException {
  9.         Counter counter = new Counter();
  10.         Thread threadA = new CounterThread(counter, 10);
  11.         Thread threadB = new CounterThread(counter, 11);
  12.         System.out.println("Starting A");
  13.         threadA.start();
  14.         System.out.println("Starting B");
  15.         threadB.start();
  16.         threadB.join();
  17.         threadA.join();
  18.         System.out.println("count: " + counter.count);
  19.     }      
  20. }
  21.  
  22. public class CounterThread extends Thread {
  23.  
  24.     Counter counter;
  25.     int n = 0;
  26.  
  27.     public CounterThread(Counter counter, int n) {
  28.         this.counter = counter;
  29.         this.n = n;
  30.     }
  31.  
  32.     public void run() {
  33.         for (int i = 0; i < n; i++) {
  34.             counter.add(i);
  35.         }
  36.     }
  37. }
  38. public class Counter {
  39.     int count = 0;
  40.  
  41.     public synchronized void add(int value) {
  42.         this.count += value;
  43.         try {
  44.             Thread.sleep(10);
  45.         } catch (InterruptedException ex) {
  46.             System.err.println("Should not get here!" + ex);
  47.         }
  48.     }    
  49.  
  50. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:7: error: class main is public, should be declared in a file named main.java
public class main {
       ^
Main.java:22: error: class CounterThread is public, should be declared in a file named CounterThread.java
public class CounterThread extends Thread {
       ^
Main.java:38: error: class Counter is public, should be declared in a file named Counter.java
public class Counter {
       ^
3 errors
stdout
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Standard output is empty
https://ideone.com/AAvng8
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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