What happens when you try to compile and run this application? : Questions « Utility Classes « SCJP

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SCJP » Utility Classes » Questions

8.33.29.What happens when you try to compile and run this application?

import java.util.Set;

import java.util.TreeSet;



public class MainClass {

  public static void main(String[] a) {

    Set<Apple> set = new TreeSet<Apple>();

    set.add(new Apple());

    set.add(new Apple());

    set.add(new Apple());

    System.out.println(set);

  }

}



class Apple {

}



A.      Compiler error.

B.      No exception is thrown.

8.33.Questions
	8.33.1.	Which of the calls modifies the string s?
	8.33.2.	Answer: string value
	8.33.3.	Which is the output of the following code?
	8.33.4.	Answer: compare two strings
	8.33.5.	You can subclass java.lang.Math to create your own class(True/False).
	8.33.6.	Answer: Math class and subclass
	8.33.7.	Which is the output of the following code fragment?
	8.33.8.	Answer: Math.cos
	8.33.9.	After execution of line 2, sbuf still references the same instance.
	8.33.10.	Answer: StringBuffer reference
	8.33.11.	What is the output of the following code(string literal comparision)?
	8.33.12.	Answer: string literal comparision
	8.33.13.	What is the output of the following code(string literal and reference)?
	8.33.14.	Answer: string literal and reference
	8.33.15.	Which of the following are legal Java statements?
	8.33.16.	Answer: Integer wrapper
	8.33.17.	Is it a legal statement: List theList = new Vector;
	8.33.18.	Answer: generic class
	8.33.19.	Which of the following are legal(enhanced while loop)?
	8.33.20.	Answer: enhanced while loop
	8.33.21.	What is the legal clone() methods when subclassing Object?
	8.33.22.	Answer: clone method
	8.33.23.	Which of the following classes implement java.util.List?
	8.33.24.	Answer: java.util.List inheritance
	8.33.25.	Which of the following are methods of the java.util.SortedSet interface?
	8.33.26.	Answer: java.util.SortedSet
	8.33.27.	Which line of code tells a scanner called sc to use a single digit as a delimiter?
	8.33.28.	Answer: Scanner class
	8.33.29.	What happens when you try to compile and run this application?
	8.33.30.	Answer: TreeSet
	8.33.31.	How to compare two arrays
	8.33.32.	Answer: java.util.Arrays
	8.33.33.	StringBuilder is generally faster than StringBuffer(True/False).
	8.33.34.	Answer: StringBuilder and StringBuffer
	8.33.35.	StringBuilder is threadsafe; StringBuffer is not(True/False).
	8.33.36.	Answer: StringBuilder and StringBuffer(2)
	8.33.37.	The Class class is the superclass of the Object class(True/False).
	8.33.38.	Answer: Class and Object

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