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Q111. Which statement will empty the contents of a StringBuilder variable named sb? 

A. sb.deleteAll(); 

B. sb.delete(0, sb.size()); 

C. sb.delete(0, sb.length()); 

D. sb.removeAll(); 

Answer:

Q112. 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. 

Q113. Which two are benefits of polymorphism? 

A. Faster code at runtime 

B. More efficient code at runtime 

C. More dynamic code at runtime 

D. More flexible and reusable code 

E. Code that is protected from extension by other classes 

Answer: C,D 

Q114. 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 

Q115. Given the code fragment: 

What is the result? 

A. A B C 

B. A B C D E 

C. A B D E 

D. Compilation fails. 

Answer:

Q116. Given: 

public class String1 { 

public static void main(String[] args) { 

String s = "123"; 

if (s.length() >2) 

s.concat("456"); 

for(int x = 0; x <3; x++) 

s += "x"; 

System.out.println(s); 

What is the result? 

A. 123 

B. 123xxx 

C. 123456 

D. 123456xxx 

E. Compilation fails 

Answer:

Explanation: 123xxx 

The if clause is not applied. 

Note: Syntax of if-statement: 

if ( Statement ) { 

Q117. Given the following two classes: 

How should you write methods in the ElectricAccount class at line n1 so that the member variable bill is always equal to the value of the member variable kwh multiplied by the member variable rate? 

Any amount of electricity used by a customer (represented by an instance of the customer class) must contribute to the customer's bill (represented by the member variable bill) through the method useElectricity method. An instance of the customer class should never be able to tamper with or decrease the value of the member variable bill. 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:

Q118. Given the code fragment: 

Which modification enables the code to print 54321? 

A. Replace line 6 with System, out. print (–x) ; 

B. At line 7, insert x –; 

C. Replace line 6 with –x; and, at line 7, insert system, out. print (x); 

D. Replace line 12 With return (x > 0) ? false: true; 

Answer:

Q119. Given the fragment: 

String[][] arra = new String[3][]; 

arra[0] = new String[]{"rose", "lily"}; 

arra[1] = new String[]{"apple", "berry","cherry","grapes"}; 

arra[0] = new String[]{"beans", "carrot","potato"}; 

// insert code fragment here 

Which code fragment when inserted at line '// insert code fragment here', enables the code to successfully change arra elements to uppercase? 

A. String[][] arra = new String[3][]; 

arra[0] = new String[]{"rose", "lily"}; 

arra[1] = new String[]{"apple", "berry","cherry","grapes"}; 

arra[0] = new String[]{"beans", "carrot","potato"}; 

for (int i = 0; i < arra.length; i++) { 

for (int j=0; j < arra[i].length; j++) { 

arra[i][j] = arra[i][j].toUpperCase(); 

B. for (int i = 0; i < 3; i++) { 

for (int j=0; j < 4; j++) { 

arra[i][j] = arra[i][j].toUpperCase(); 

C. for (String a[]:arra[][]) { 

for (String x:a[]) { 

D. toUpperCase(); 

E. for (int i:arra.length) { 

for (String x:arra) { 

arra[i].toUpperCase(); 

Answer:

Explanation: 

Incorrect: 

not A: arra.length is 3, but the subarrays have 2, 3 and 4 elements. Index will be out of 

bound. 

not B: The subarrys are of different lengths. Index will be out of bound. 

not D: Compile error. 

Q120. 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: