SCJP 5.0 Questions
01. MockExam - 01
02. MockExam - 02
03. MockExam - 03
04. AutoBoxing - 1 (10 questions)
05. AutoBoxing - 2 (10 questions)
06. Generics 1 - 6 Questions
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08. Generics 3 - 10 Questions
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14. Enums 3 - 15 Questions
15. Var Args 1 - 10 Questions
16. Var Args 2 - 10 Questions
17. SCJP 5.0 Mock Questions -1
18. Declaration,Access Control-1
19.Java File IO Package - 1
20.Java File IO Package - 2
21.Language Features - 1
22.New Api's - 1 (10 questions)
23.New Api's - 2 (12 questions)
24.Objective - 1 (20 questions)
25.Objective - 2 (10 questions)
26.Objective - 3 (10 questions)
27.Objective - 4 (10 questions)
28.Objective - 5 (10 questions)
29.Objective - 6 (10 questions)
30.Objective - 7 (10 questions)
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Boxing Conversions - 2 (10 Questions)

3) What will be the output of the following program?


	package wrapper_boxing;

public class WrapperTest2 {

	public static void main(String[] args) {
		
		Boolean bool1 = new Boolean(true);
		Boolean bool2 = new Boolean(false);
		Boolean bool3 = new Boolean("false");
		Boolean bool4 = new Boolean(bool1);
		
		System.out.println(bool1.equals(bool4));
		System.out.println(bool2 == bool3);
		System.out.println(bool1 == bool4);
		
	}
}

  1. The program will not compile because the creation of bool4 object will cause compilation error.
  2. The program will produce the output 'true false false'.
  3. The program will produce the output 'true true true'.
  4. The program will output 'true false true'.

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Answer

3)2
The first comparison statement compares the value of two objects and hence will return true. Whereas the second and the third comparison verfires whether the references are pointing to the same object, in which case both the comparisons will fail.

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