Test Index

Multi Threading

Question : 13

Total: 44

Given:

1. public class TestFive {
2.   private int x;
3.   public void foo() {
4.    int current = x;
5.    x = current + 1;
6.   }
7.   public void go() {
8.    for(int i = 0; i < 5; i++) {
9.     new Thread() {
10.      public void run() {
11.      foo();
12.      System.out.print(x + ", ");
13.     } }.start();
14.    } }

Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ? (Choose two.)

move the line 12 print statement into the foo() method
change line 7 to public synchronized void go() {
change the variable declaration on line 2 to private volatile int x;
wrap the code inside the foo() method with a synchronized( this ) block
wrap the for loop code inside the go() method with a synchronized block synchronized(this){ // for loop code here }

Validate

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