Question 1

Assume the following variable has been declared and given a value as shown:   Which is the value of data[1][2]?

Accepted Answer

A) 0 
B) 17 
C) 15 
D) 2 
A) 0 
B) 17 
C) 15 
D) 2

Question 2

Your program needs to store an integer sequence of unknown length.Which of the following is most suitable to use?

Accepted Answer

A) An array declared as int[] marks; B) A array list declared as ArrayList marks = new ArrayList(); C) An array declared as int marks[10000]; D) An array declared as int marks[10]; A) An array declared as int[] marks; B) A array list declared as ArrayList marks = new ArrayList(); C) An array declared as int marks[10000]; D) An array declared as int marks[10];

Question 3

A collection of test cases that can be used on future versions of a program is called:

Accepted Answer

A) a test suite. 
B) cycling. 
C) debugging. 
D) version control. 
A) a test suite. 
B) cycling. 
C) debugging. 
D) version control.

Question 4

Consider the following code snippet:   What is the value of numarray[1][2] after the code snippet is executed?

Accepted Answer

A) 2 
B) 5 
C) 3 
D) 4 
A) 2 
B) 5 
C) 3 
D) 4

Question 5

Which one of the following statements about declaring an array list as a method parameter is true?

Accepted Answer

A) An array list declared as a method parameter should be accompanied with its size. 
B) An array list declared as a method parameter is a constant value by default. 
C) An array list value cannot be modified in a method when the array list is declared as a parameter. 
D) An array list value can be modified inside the method. 
A) An array list declared as a method parameter should be accompanied with its size. 
B) An array list declared as a method parameter is a constant value by default. 
C) An array list value cannot be modified in a method when the array list is declared as a parameter. 
D) An array list value can be modified inside the method.

Question 6

Consider the following line of code for calling a method named func1:
func1(listData, varData);
Which one of the following method headers is valid for func1, where listData is an integer array list and varData is an integer variable?

Accepted Answer

A) public void func1(int[] listData, int varData) B) public void func1(ArrayList listData, varData) C) public void func1(ArrayList ldata, int vdata) D) public void func1(int vdata, ArrayList ldata) A) public void func1(int[] listData, int varData) B) public void func1(ArrayList listData, varData) C) public void func1(ArrayList ldata, int vdata) D) public void func1(int vdata, ArrayList ldata)

Question 7

In a partially filled array, the number of slots in the array that are not currently used is the

Accepted Answer

A) length of the array minus the number of elements currently in the array. 
B) number of elements currently in the array minus the length of the array. 
C) length of the array plus the number of elements currently in the array. 
D) number of elements currently in the array. 
A) length of the array minus the number of elements currently in the array. 
B) number of elements currently in the array minus the length of the array. 
C) length of the array plus the number of elements currently in the array. 
D) number of elements currently in the array.

Question 8

The integer array numbers will be filled with values from the Scanner object in.If there are more input values than there are spaces in the array, only enough values to fill the array should be read.The integer variable currentSize should be set to the number of values read.Partial code to do this is given below:   What condition will complete this code?

Accepted Answer

A) currentSize < numbers.length && in.hasNextInt() 
B) currentSize < numbers.length || in.hasNextInt() 
C) currentSize <= numbers.length && in.hasNextInt() 
D) currentSize <= numbers.length || in.hasNextInt() 
A) currentSize < numbers.length && in.hasNextInt() 
B) currentSize < numbers.length || in.hasNextInt() 
C) currentSize <= numbers.length && in.hasNextInt() 
D) currentSize <= numbers.length || in.hasNextInt()

Question 9

Which one of the following code snippets accepts the integer input in an array list named num1 and stores the odd integers of num1 in another array list named oddnum?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 10

What is the output of the following code snippet?

Accepted Answer

A) 1050 
B) 2030 
C) 3040 
D) 4050 
A) 1050 
B) 2030 
C) 3040 
D) 4050

Question 11

If a programmer confuses the method required for checking the length of a string and uses size() instead of length(), what will happen?

Accepted Answer

A) The program will crash. 
B) The program will not compile. 
C) The program will run but will produce an uncertain result. 
D) The compiler will automatically correct the error. 
A) The program will crash. 
B) The program will not compile. 
C) The program will run but will produce an uncertain result. 
D) The compiler will automatically correct the error.

Question 12

Consider the telephone book as a physical object that can help understand algorithms.What kind of algorithm might be visualized using it?

Accepted Answer

A) sorting 
B) searching 
C) finding the maximum 
D) Monte Carlo methods 
A) sorting 
B) searching 
C) finding the maximum 
D) Monte Carlo methods

Question 13

Assume the array of integers values has been created.Which condition must be used in the indicated area so the loop below will assign max the largest value in values?

Accepted Answer

A) max > val 
B) val > max 
C) values[val] > max 
D) max > values[val] 
A) max > val 
B) val > max 
C) values[val] > max 
D) max > values[val]

Question 14

What is the output of the following statements?

Accepted Answer

A) Cal, Bob, Ann 
B) Ann, Bob 
C) Ann, Tony 
D) Cal, Bob, Tony 
A) Cal, Bob, Ann 
B) Ann, Bob 
C) Ann, Tony 
D) Cal, Bob, Tony

Question 15

Why is the use of physical objects helpful in algorithm design?

Accepted Answer

A) It simulates the way the computer actually implements the algorithm. 
B) It is more abstract than using a pencil and paper. 
C) Because the constraints on physical things are the same as the constraints on bits and bytes. 
D) Many people feel it is less intimidating than drawing diagrams. 
A) It simulates the way the computer actually implements the algorithm. 
B) It is more abstract than using a pencil and paper. 
C) Because the constraints on physical things are the same as the constraints on bits and bytes. 
D) Many people feel it is less intimidating than drawing diagrams.

Question 16

Which one of the following is the correct definition for initializing data in a two-dimensional array with three rows and two columns?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 17

Consider the following code snippet:   In Java 6 and later, which statement copies the data array to the data2 array?

Accepted Answer

A) data2 = Arrays.copyOf(data, data2.length); 
B) data2 = Arrays.copyOf(data, data.length); 
C) data2 = Arrays.copyOf(data, data.size()); 
D) data2 = Arrays.copyOf(data); 
A) data2 = Arrays.copyOf(data, data2.length); 
B) data2 = Arrays.copyOf(data, data.length); 
C) data2 = Arrays.copyOf(data, data.size()); 
D) data2 = Arrays.copyOf(data);

Question 18

What is the output of the following code snippet?

Accepted Answer

A) 4 
B) 2 
C) 3 
D) 6 
A) 4 
B) 2 
C) 3 
D) 6

Question 19

What is the value of the count variable after the execution of the code snippet below?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 0 
A) 1 
B) 2 
C) 3 
D) 0

Question 20

Which one of the following statements is correct for the given code snippet?

Accepted Answer

A) Line 2 declares and initializes an array of three elements with value 5. 
B) Line 2 causes a bounds error because 3 is an invalid index number. 
C) Line 2 initializes the third element of the array with value 5. 
D) Line 2 initializes all the elements of the array with value 5. 
A) Line 2 declares and initializes an array of three elements with value 5. 
B) Line 2 causes a bounds error because 3 is an invalid index number. 
C) Line 2 initializes the third element of the array with value 5. 
D) Line 2 initializes all the elements of the array with value 5.

Exam 7: Arrays and Array Lists

Assume the following variable has been declared and given a value as shown: Which is the value of data[1][2]?

Your program needs to store an integer sequence of unknown length.Which of the following is most suitable to use?

A collection of test cases that can be used on future versions of a program is called:

Consider the following code snippet: What is the value of numarray[1][2] after the code snippet is executed?

Which one of the following statements about declaring an array list as a method parameter is true?

Consider the following line of code for calling a method named func1: func1(listData, varData); Which one of the following method headers is valid for func1, where listData is an integer array list and varData is an integer variable?

In a partially filled array, the number of slots in the array that are not currently used is the

Which one of the following code snippets accepts the integer input in an array list named num1 and stores the odd integers of num1 in another array list named oddnum?

What is the output of the following code snippet?

If a programmer confuses the method required for checking the length of a string and uses size() instead of length(), what will happen?

Consider the telephone book as a physical object that can help understand algorithms.What kind of algorithm might be visualized using it?

Assume the array of integers values has been created.Which condition must be used in the indicated area so the loop below will assign max the largest value in values?

What is the output of the following statements?

Why is the use of physical objects helpful in algorithm design?

Which one of the following is the correct definition for initializing data in a two-dimensional array with three rows and two columns?

Consider the following code snippet: In Java 6 and later, which statement copies the data array to the data2 array?

What is the output of the following code snippet?

What is the value of the count variable after the execution of the code snippet below?

Which one of the following statements is correct for the given code snippet?

Introduction

Using Objects

Implementing Classes

Fundamental Data Types

Decisions

Loops

Designing Classes

Inheritance

Interfaces

Input/Output and Exception Handling

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Stream Processing

Graphical User Interfaces

Advanced Input/Output

Multithreading

Internet Networking

Relational Databases

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