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发布时间：2006-06-28 10:51     点击：

E. It tells the state of certain keys on the keybord at the time of the event.

F. It is an indication of the time at which the event occurred.

4. Which statement about listener is true?

A. Most component allow multiple listeners to be added.

B. If multiple listener be add to a single component, the event only affected one listener.

C. Component don?t allow multiple listeners to be add.

D. The listener mechanism allows you to call an addXxxxListener method as many times as is needed, specifying as many different listeners as your design require.

5.Give the following code:

public class Example{

public static void main(String args[] ){

int l=0;

do{

System.out.println(“Doing it for l is:”+l);

}while(--l>0)

System.out.println(“Finish”);

}

}

Which well be output:

A. Doing it for l is 3

B. Doing it for l is 1

C. Doing it for l is 2

D. Doing it for l is 0

E. Doing it for l is ?C1

F. Finish

6. Give the code fragment:

1) switch(x){

2) case 1:System.out.println(“Test 1”);break;

3) case 2:

4) case 3:System.out.println(“Test 2”);break;

5) default:System.out.println(“end”);

6) }

which value of x would cause “Test 2” to the output:

A. 1

B. 2

C. 3

D. default

7. Give incompleted method:

1)

2) { if(unsafe()){//do something…}

3) else if(safe()){//do the other…}

4) }

The method unsafe() well throe an IOException, which completes the method of declaration when added at line one?

A. public IOException methodName()

B. public void methodName()

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