SCJP 1.4 Mock Exam

Mock Exam – 4

Q1	public class Test1{ static void method(Object obj){ System.out.println(“Object”); } static void method(String str){ System.out.println(“String”); } public static void main(String args[]){ method(null); } } What will be the output?
A1	String
A2	Object
A3	null
A4	Compiler Error
Q2	public class Test2{ static void method(StringBuffer obj){ System.out.println(“StringBuffer”); } static void method(String str){ System.out.println(“String”); } public static void main(String args[]){ method(null); } } What will be the output?
A1	String
A2	Object
A3	null
A4	Compiler Error
Q3	class Test{} public class Test3{ static void method(Object obj){ System.out.println(“StringBuffer”); } static void method(String str){ System.out.println(“String”); } static void method(Test t){ System.out.println(“Test”); } public static void main(String args[]){ method(null); } } What will be the output?
A1	String
A2	Object
A3	Test
A4	Compiler Error
Q4	public class Test4{ public static void main(String args[]){ I i1 = new A(); I i2 = new B(); A a = new A(); System.out.println(i1 instanceof I); System.out.println(i2 instanceof B); System.out.println(a instanceof I); } } interface I{} class A implements I{} class B implements I{} What will be the output?
A1	true true true
A2	true false true
A3	true false false
A4	Compiler Error
Q5	public class Test5{ public static void main(String args[]){ System.out.println(I.k); } } interface I{ int k; } What will be the output?
A1	true true true
A2	true false true
A3	true false false
A4	Compiler Error
Q6	public class Test6 implements I{ int k = 1; public static void main(String args[]){ System.out.println(k); } } interface I{ int k = 0; } What will be the output?
A1	0
A2	1
A3	null
A4	Compiler Error
Q7	public class Test7 implements I{ int k = 1; static{ k = k * 2; } { k = k * 2; } public static void main(String args[]){ Test7 t1 = new Test7(); Test7 t2 = new Test7(); System.out.println(t1.k); System.out.println(t2.k); System.out.println(k); } } What will be the output?
A1	0
A2	1
A3	null
A4	Compiler Error
Q8	public class Test8{ static int k = 1; static{ k = k * 2; } { k = k * 2; } public static void main(String args[]){ System.out.println(k); } } What will be the output?
A1	1
A2	2
A3	4
A4	Compiler Error
Q9	public class Test9{ static int k = 1; { k = k * 2; } public static void main(String args[]){ System.out.println(k); } } What will be the output?
A1	1
A2	2
A3	4
A4	Compiler Error
Q10	public class Test10{ final static int k; static{ k = 0; } public static void main(String args[]){ System.out.println(k); } } What will be the output?
A1	0
A2	1
A3	null
A4	Compiler Error
Answers
1	String
2	Compiler Error
3	Compiler Error
4	true true true
5	true true true
6	Compiler Error
7	Compiler Error
8	2
9	1
10	0