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Q101. Which three statements are true about the structure of a Java class? 

A. A class can have only one private constructor. 

B. A method can have the same name as a field. 

C. A class can have overloaded static methods. 

D. A public class must have a main method. 

E. The methods are mandatory components of a class. 

F. The fields need not be initialized before use. 

Answer: A,B,C 

Explanation: A: Private constructors prevent a class from being explicitly instantiated by its 

callers. 

If the programmer does not provide a constructor for a class, then the system will always 

provide a default, public no-argument constructor. To disable this default constructor, 

simply add a private no-argument constructor to the class. This private constructor may be 

empty. 

B: The following works fine: 

int cake() { 

int cake=0; 

return (1); 

C: We can overload static method in Java. In terms of method overloading static method 

are just like normal methods and in order to overload static method you need to provide 

another static method with same name but different method signature. 

Incorrect: 

Not D: Only a public class in an application need to have a main method. 

Not E: 

Example: 

class A 

public string something; 

public int a; 

Q: What do you call classes without methods? Most of the time: An anti pattern. 

Why? Because it faciliates procedural programming with "Operator" classes and data 

structures. You separate data and behaviour which isn't exactly good OOP. 

Often times: A DTO (Data Transfer Object) 

Read only datastructures meant to exchange data, derived from a business/domain object. 

Sometimes: Just data structure. 

Well sometimes, you just gotta have those structures to hold data that is just plain and 

simple and has no operations on it. 

Not F: Fields need to be initialtized. If not the code will not compile. 

Example: 

Uncompilable source code - variable x might not have been initialized 


Q102. Given: 

public class Test1 { 

static void doubling (Integer ref, int pv) { 

ref =20; 

pv = 20; 

public static void main(String[] args) { 

Integer iObj = new Integer(10); 

int iVar = 10; 

doubling(iObj++, iVar++); 

System.out.println(iObj+ ", "+iVar); 

What is the result? 

A. 11, 11 

B. 10, 10 

C. 21, 11 

D. 20, 20 

E. 11, 12 

Answer:

Explanation: The code doubling(iObj++, iVar++); increases both variables from to 10 to 

11. 


Q103. Given: 

package p1; 

public class Test { 

static double dvalue; 

static Test ref; 

public static void main(String[] args) { 

System.out.println(ref); 

System.out.println(dvalue); 

What is the result? 

A. p1.Test.class 

0.0 

B. <the summary address refrenced by ref> 0.000000 

C. Null 

0.0 

D. Compilation fails 

E. A NullPointerException is thrown at runtime 

Answer:


Q104. Given: 

What is the result? 

A. Area is 6.0 

B. Area is 3.0 

C. Compilation fails at line n1 

D. Compilation fails at line n2. 

Answer:


Q105. Given the code fragment: 

float x = 22.00f % 3.00f; 

int y = 22 % 3; 

System.out.print(x + ", "+ y); 

What is the result? 

A. 1.0, 1 

B. 1.0f, 1 

C. 7.33, 7 

D. Compilation fails 

E. An exception is thrown at runtime 

Answer:


Q106. Given the code fragments: 

What is the result? 

A. Super Sub Sub 

B. Contract Contract Super 

C. Compilation fails at line n1 

D. Compilation fails at line n2 

Answer:


Q107. Which two are Java Exception classes? 

A. SercurityException 

B. DuplicatePathException 

C. IllegalArgumentException 

D. TooManyArgumentsException 

Answer: A,C 


Q108. Given the code fragment: 

What is the result? 

A. Sum is 600 

B. Compilation fails at line n1. 

C. Compilation fails at line n2. 

D. A ClassCastException is thrown at line n1. 

E. A ClassCastException is thrown at line n2. 

Answer:


Q109. Given: 

What is the result? 

A. 400 200 

B. 200 200 

C. 400 400 

D. Compilation fails. 

Answer:


Q110. Given the code fragment: 

Which three code fragments can be independently inserted at line nl to enable the code to print one? 

A. Byte x = 1; 

B. short x = 1; 

C. String x = "1"; 

D. Long x = 1; 

E. Double x = 1; 

F. Integer x = new Integer ("1"); 

Answer: A,B,F