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Mock Exam - Constructor

Q1	public class Test1 extends Base{     Test1(long i){}     public static void main(String args[]){} } class Base{     Base(int i){} } Which of the following constructors are if present in Base, will the program will compile properly?
A1	Base(){}
A2	Base(long l){}
A3	Base(float f){}
A4	It will compile properly.

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Q2	public class Test2 extends Base{     Test2(long i){         super(2);     }     Test2(){}     public static void main(String args[]){         new Test2(2);     } } class Base{     Base(int i){         System.out.println(i);     }     Base(byte i){         System.out.println(i*2);     } }  what will be the output?
A1	2
A2	4
A3	Compiler Error
A4	It will compile if we add super(2) in Test2().

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Q3	which of the following keywords can be applied to constructors?
A1	private
A2	public
A3	void
A4	All the above

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Q4	which of the following are valid constructors?
A1	Test4(){}
A2	void Test4(){}
A3	private Test4(){}
A4	All the above.

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Q5	which of the following statements are true?
A1	constructors can be overriden.
A2	constructors can be overloaded
A3	constructors can return a value
A4	constructors can be static.

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Q6	public class Test6{     Test6(int i, int j){         System.out.println("Int");     }     Test6(short i, short j){         System.out.println("Short");     }     Test6(byte i, byte j){         System.out.println("Byte");     }     public static void main(String args[]){         Test6 t = new Test6(1,2);     } } which of the following statements are true?
A1	Int
A2	Byte
A3	Short
A4	Compiler error

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Q7	public class Test7{     Test7(int i, int j){         System.out.println("Int");     }     Test7(short i, short j){         System.out.println("Short");     }     Test7(byte i, byte j){         System.out.println("Byte");     }     public static void main(String args[]){         byte b1 = 1;         byte b2 = 2;         Test7 t1 = new Test7(b1,b1);         Test7 t2 = new Test7(b1*1,b1*2);         Test7 t3 = new Test7(b1*b1,b1*b2);     } } what will be the output?
A1	Byte Int Int
A2	Byte Byte Byte
A3	Byte Int Byte
A4	Int Int Int

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Q8	public class Test8 extends Base{     Test8(){}     public static void main(String args[]){} } class Base{     Base() throws Exception{} } what is the output?
A1	Byte Int Int
A2	Byte Byte Byte
A3	Byte Int Byte
A4	Int Int Int

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Q9	public class Test9 extends Base{    Test9()throws Exception{}    Test9(int i) {}    public static void main(String args[])throws Exception{       new Test9();    } } class Base{    Base() throws Exception{       System.out.println("Base");    } }  what is the output?
A1	Base
A2	Compiler Error.
A3	Runtime exception
A4	none of the above

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Q10	public class Test10 extends Base{     Test10(){}     Test10(int i) {}     public static void main(String args[]){         new Test10();     } } class Base{     Base() {         System.out.println("Base");     }     Base(int i) throws Exception{         System.out.println("No argument constructor.");     } } what is the output?
A1	Base
A2	Compiler Error.
A3	Runtime exception
A4	none of the above

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11	class Test11 extends B {     private Test11() { super(); }     public Test11(String msg) { this(); }     public Test11(int i) {} } class A {     public A() {}     public A(int i) { this(); } } class B extends A {     public boolean B(String msg) { return false; } } Select all valid answers:
A1	The code will fail to compile.
A2	The constructor in A that takes an int as argument will never be called as a result of constructing an object of class B or Test11.
A3	class Test11 has three constructors.
A4	At most one of the constructors of each class is called as a result of constructing an object of class Test11.

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12	Which of the following statements are true?
A1	The default constructor has a return type of void
A2	The default constructor takes a sungle parameter.
A3	The default constructor takes no parameters
A4	The default constructor is not created if the class has anyconstructors of its own.

Answers

1	Base(){}
2	It will compile if we add super(2) in Test2().
3	private public
4	Test4(){} private Test4(){}
5	constructors can be overloaded.
6	Int
7	Byte Byte Int
8	Byte Byte Int
9	Compiler Error.
10	Base
11	B) The constructor in A that takes an int as argument will never be called as a result of constructing an object of class B or Test11. C)class Test11 has three constructors.
12	3) The default constructor takes no parameters 4) The default constructor is not created if the class has any constructors of its own.

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