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Q1. Given: 

What would be the output, if it is executed as a program? 

A. name =, pass = 

B. name = null, pass = null 

C. name = null, pass = false 

D. name = null pass = true E. Compile error. 

Answer:

Explanation: 

Both name and pass variables are instance variables, and we haven't given them any 

values, so they take their default values. For Boolean default value is false and for string 

which is not a primitive type default is null So at line 7, null will printed as the value of the 

variable name, and at line 8 false will be printed. Hence Option C is correct. 

As explained above options A, B and D are incorrect. 

Code compiles fine so option E is incorrect. 

Reference: 

https://docs.oracle.com/javaseAutorial/java/javaOOAariables.html 


Q2. The protected modifier on a Field declaration within a public class means that the field ______________. 

A. Cannot be modified 

B. Can be read but not written from outside the class 

C. Can be read and written from this class and its subclasses only within the same package 

D. Can be read and written from this class and its subclasses defined in any package 

Answer:

Reference: 

http://beginnersbook.com/2013/05/java-access-modifiers/ 


Q3. Given the code fragment: 

public class ForTest { 

public static void main(String[] args) { 

int[] array = {1, 2, 3}; 

for ( foo ) { 

Which three code fragments, when replaced individually for foo, enables the program to compile? 

A. int i : array 

B. int i = 0; i < 1; 

C. ; ; 

D. ; i < 1; i++ 

E. i = 0; i<1; 

Answer: A,B,C 


Q4. Given: 

What is the result? 

A. 400 200 

B. 200 200 

C. 400 400 

D. Compilation fails. 

Answer:


Q5. Given: 

abstract class A1 { 

public abstract void m1(); 

public void m2() { System.out.println("Green"); } 

abstract class A2 extends A1 { 

public abstract void m3(); 

public void m1() { System.out.println("Cyan"); } 

public void m2() { System.out.println("Blue"); } 

public class A3 extends A2 { 

public void m1() { System.out.println("Yellow"); } 

public void m2() { System.out.println("Pink"); } 

public void m3() { System.out.println("Red"); } 

public static void main(String[] args) { 

A2 tp = new A3(); 

tp.m1(); 

tp.m2(); 

tp.m3(); 

What is the result? 

A. Yellow Pink Red 

B. Cyan Blue Red 

C. Cyan Green Red 

D. Compilation Fails 

Answer:


Q6. Given: 

class Mid { 

public int findMid(int n1, int n2) { 

return (n1 + n2) / 2; 

public class Calc extends Mid { 

public static void main(String[] args) { 

int n1 = 22, n2 = 2; 

// insert code here 

System.out.print(n3); 

Which two code fragments, when inserted at // insert code here, enable the code to compile and print 12? 

A. Calc c = new Calc(); int n3 = c.findMid(n1,n2); 

B. int n3 = super.findMid(n1,n3); 

C. Calc c = new Mid(); int n3 = c.findMid(n1, n2); 

D. Mid m1 = new Calc(); int n3 = m1.findMid(n1, n2); 

E. int n3 = Calc.findMid(n1, n2); 

Answer: A,D 

Explanation: 

Incorrect: 

Not B: circular definition of n3. 

Not C: Compilation error. line Calc c = new Mid(); 

required: Calc 

found: Mid 

Not E: Compilation error. line int n3 = Calc.findMid(n1, n2); 

non-static method findMid(int,int) cannot be referenced from a static context 


Q7. Given: 

What is the result? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:


Q8. Given: 

What is the result? 

A. C B A 

B. C 

C. A B C 

D. Compilation fails at line n1 and line n2 

Answer:


Q9. Given: 

Which two classes use the shape class correctly? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

F. Option F 

Answer: B,E 

Explanation: When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (E). However, if it does not, then the subclass must also be declared abstract (B). Note: An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. 


Q10. Given the code fragment: 

Which code fragment, when inserted at line 3, enables the code to print 10:20? 

A. int[] array n= new int[2]; 

B. int[] array; array = int[2]; 

C. int array = new int[2]; 

D. int array [2] ; 

Answer: