格林模拟试题一（下）(7)

 question 51)

what will happen when you compile and run the following code?

public class scope{
public static void main(string argv){
s.amethod();
public static void amethod(){
}//end of amethod

1) a value of 0 will be printed out 
3) a compile time error 
question 52)
 

1) create an instance of the gridbagconstraints class, call the weightx() method and then pass the gridbagconstraints instance with the component to the setconstraints method of the gridbaglayout class. 
3) create an instance of the gridbaglayout class, set the weightx field and then call the setconstraints method of the gridbaglayoutclass with the component as a parameter. 
||| question 53)
1) change the current directory 
3) delete a file 

question 54)

which statement is true of the following code?

public class rpcraven{
pmcraven pm1 = new pmcraven("one");
pmcraven pm2 = new pmcraven("two");
}

class pmcraven extends thread{
pmcraven(string s){

}
for(int i =0; i < 2 ; i++){
sleep(1000);

yield();
}

}

1) compile time error, class rpcraven does not import java.lang.thread
3) output of one two one two