Java认证模考试题（四）
What will be output after execution of the following code:
outer: for(int i=0;i<3; i++)
inner: for(int j=0;j<2;j++)
{
if(j==1) continue outer;
System.out.println(j+ ?and ?+i);
}
A. 0 and 0
B. 0 and 1
C. 0 and 2
D. 1 and 0
E. 1 and 1
F. 1 and 2
G. 2 and 0
H. 2 and 1
I. 2 and 2
Explanation:
The continue statement is used to skip over and jump to the end of the loop body. Then if j equals to 1 it will jump to the end of the inner loop body.
Correct Answer: A,B,C 21 of 60
Question: 22
Given the following code:
switch (m)
{
case 0: System.out.println(Condition 0);
case 1: System.out.println(Condition 1);
case 2: System.out.println(Condition 2);
case 3: System.out.println(Condition 3);break;
default: System.out.println(Other Condition);
}
Which values of m will cause Condition 2 is output?
A. 0
B. 1
C. 2
D. 3
E. 4
F. None
Explanation:
In the block of switch, if there is no break sentence in one case the following sentences will be executed.
Correct Answer: A,B,C 22 of 60
Question: 23
Which method is called when the browser returns to the page containing the applet after moving to another URL?
A. init()
B. start()
C. stop()
D. destroy()
Explanation:
The start() runs whenever the applet becomes visible, such as when the browser returns to the page containing the applet after moving to another URL or the browser is restored after being iconized.
Correct Answer: B 23 of 60
Question: 24
If a thread calls the wait() method, which methods can make it continue to run?
A. join()
B. resume()
C. notify()
D. notifyAll()
E. high priority thread is ready
Explanation:
If a thread issues a wait() call it will pause execution until another thread issues a notify() or notifyAll() call. The pair of the methods are provided for thread communication.
Correct Answer: C,D 24 of 60
Question: 25
Which method is used to define the execution body of a thread?
A. start()
B. init()
C. run()
D. main()
E. synchronized()
Explanation:
The threads will always begin executing at the run() method, which contains the definition of the execution body.
Correct Answer: C 25 of 60
Question: 26
Which keyword is used to allow interaction with the lock flag?
A. native
B. static
C. synchronized
D. abstract
Explanation:
Every object has a lock flag. The synchronized keyword enables interaction with the flag, which allow exclusive access to that object.
Correct Answer: C 26 of 60
Question: 27
Which modifiers are legal in Java?
A. private
B. public
C. protected
D. protect
E. friend
Explanation:
The public, private, protected and no modifier are legal modifiers. The friend and protect are illegal in Java.
Correct Answer: A,B,C 27 of 60
Question: 28
If a member variable of a class can be accessible only by the same package, which modifier should be used?
A. private
B. public
C. protected
D. no modifier
E. final
Explanation:
No modifier is the default access level. The default modifier means to be accessible by the classes in the same package.
Correct Answer: D 28 of 60