Java - Java.lang Class - Practice Questions

Question 1

Which method is called when an object is created?

Accepted Answer

Question 2

Which method returns the runtime class of an object?

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Question 3

Which package contains the Object class?

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Question 4

What is the purpose of the finalize() method?

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Question 5

public class Myfile 
{ 
    public static void main (String[] args) 
    {
        String biz = args[1]; 
        String baz = args[2]; 
        String rip = args[3]; 
        System.out.println("Arg is " + rip); 
    } 
}

Select how you would start the program to cause it to print: Arg is 2

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Question 6

Which method is used to compare two objects for equality?

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Question 7

What is the return type of the hashCode() method?

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Question 8

Which of the following are valid calls to 
Math.max?
Math.max(1,4)
Math.max(2.3, 5)
    Math.max(1, 3, 5, 7)
    Math.max(-1.5, -2.8f)

Accepted Answer

Question 9

What is the purpose of the wait() method?

Accepted Answer

Question 10

What does the instanceof operator check?

Accepted Answer