格林模拟试题一（下）(5)

 question 44)

what will the following code print out?

public class oct{
oct o = new oct();
}
int oi= 012;
}

1)12 
3)10 

question 45

what will happen when you try compiling and running this code?

public class ref{
ref r = new ref();
}
int i=99;
system.out.println(i);
public void multi(ref r){
}

1) error at compile time 
3) an output of 198 

question 46)

you need to create a class that will store unique object elements. you do not need to sort these elements but they must be unique.

what interface might be most suitable to meet this need?

1)set 
3)map 

question 47)

which of the following will successfully create an instance of the vector class and add an element?

1) vector v=new vector(99); 
 

2) vector v=new vector(); 
 

3) vector v=new vector(); 
 

4 vector v=new vector(100);