JAVA認(rèn)證

Question: 29

Which modifier should be used to define a constant member variable?

A. static

B. final

C. abstract

D. No modifier can be used

Explanation:

If a member variable is marked as final, it is a constant.

Correct Answer: B 29 of 60

Question: 30

Which one of the following is correct to declare a native method?

A. public native void test();

B. public native void test(){}

C. public void native test();

D. public native test(){}

Explanation:

A native method can not have a method body. And the keyword native can't be put in front of the return value of the method.

Correct Answer: A 30 of 60

Question: 31

Given the following definition of a class:

public class Test {

private float f = 1.0;

int m = 12;

static int n=1;

public static void main(String arg[]) {

Test t = new Test();

// some code...

}

}

Which of the following usage are legal?

A. t.f

B. this.n

C. Test.m

D. Test.n

Explanation:

The f and m are instance variables. They should be accessed through an object. The n is a class variable and it should be accessed through the class name.

Correct Answer: A,D 31 of 60

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