Sun Certified Java Professional (SCJP) 1.5 Question Bank - 20

A JavaBeans component has the following field:
11. private boolean enabled;
Which two pairs of method declarations follow the JavaBeans standard for accessing this field? (Choose two.)
A. public void setEnabled( boolean enabled )
   public boolean getEnabled()
B. public void setEnabled( boolean enabled )
   public void isEnabled()
C. public void setEnabled( boolean enabled )
   public boolean isEnabled()
D. public boolean setEnabled( boolean enabled )
   public boolean getEnabled()

Given:
11. public static void main(String[] args) {
12.   Object obj = new int[] { 1, 2, 3 };
13.   int[] someArray = (int[])obj;
14.   for (int i : someArray) System.out.print(i + " ");
15. }
What is the result?
A. 123
B. Compilation fails because of an error in line 12.
C. Compilation fails because of an error in line 13.
D. Compilation fails because of an error in line 14.
E. A ClassCastException is thrown at runtime.

Given:
1. public class Threads3 implements Runnable {
2.   public void run() {
3.     System.out.print("running");
4.   }
5.   public static void main(String[] args) {
6.     Thread t = new Thread(new Threads3());
7.     t.run();
8.     t.run();
9.     t.start();
10.  }
11.}
What is the result?
A. Compilation fails.
B. An exception is thrown at runtime.
C. The code executes and prints "running".
D. The code executes and prints "runningrunning".
E. The code executes and prints "runningrunningrunning".

Which three will compile and run without exception? (Choose three.)
A. private synchronized Object o;
B. void go() {
     synchronized() { /* code here */ }
C. public synchronized void go() { /* code here */ }
D. private synchronized(this) void go() { /* code here */ }
E. void go() {
     synchronized(Object.class) { /* code here */ }
F. void go() {
     Object o = new Object();
     synchronized(o) { /* code here */ }

1. public class TestOne {
2.   public static void main (String[] args) throws Exception {
3.     Thread.sleep(3000);
4.     System.out.println("sleep");
5.   }
6. }
What is the result?
A. Compilation fails.
B. An exception is thrown at runtime.
C. The code executes normally and prints "sleep".
D. The code executes normally, but nothing is printed.

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