Java has become a prominent language for building modern software applications. It is a versatile and robust programming language that is used to create web applications, mobile applications, desktop applications and server-side applications. Java is considered as one of the most widely used programming languages in the world and its popularity is only increasing.
Java MCQ test is a popular way of assessing a candidate's skills in programming with Java. Java MCQ test can help you evaluate various skills such as interpretation of code scenarios, understanding of object-oriented programming concepts, and proficiency in programming with Java. In this article, we will discuss the basics of Java MCQ test with code examples.
What is Java MCQ test?
MCQ stands for Multiple Choice Questions. Java MCQ test is an objective type test where a series of multiple-choice questions are asked to assess the candidate's Java programming skills. Java MCQ test is widely used in recruitment processes to assess a candidate’s knowledge and understanding of the language. It is also useful in academic institutions to assess the students' performance or to prepare for a certification exam.
Here are some tips to keep in mind while preparing for the Java MCQ test:
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Focus on fundamentals: Before beginning with the MCQs, make sure you have a clear understanding of the basics of Java programming. This includes data types, operators, control structures, loops, etc.
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Practice coding: Practice programming with Java to reinforce your concepts. Solve programming challenges and work on real-time projects to get hands-on experience.
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Prepare well: Prepare well with resources such as books, online tutorials, practice tests etc. This will help you get an idea of what to expect in the test.
Java MCQ Test Examples:
Let us now look at some Java MCQ test examples.
Question 1:
What will be the output of the following code?
public class Main {
public static void main(String[] args) {
int a = 10;
if(a++ == 11) {
System.out.println("Hello World");
}
else {
System.out.println("Welcome");
}
}
}
A. Welcome
B. Hello World
C. Compilation Error
D. None of the above
Answer: A. Welcome
Explanation: The if condition checks if the value of a is equal to 11 or not. Since the comparison operator is a post-increment, the value of a will be incremented after the comparison. In this case, the value of a will be 11 after the comparison. However, the if condition will evaluate to false since the comparison operator is "==" and not "=". Therefore, the else block will execute and the output will be "Welcome".
Question 2:
What is the output of the following code?
public class Main {
public static void main(String[] args) {
String str = "Hello";
str.concat(" World");
System.out.println(str);
}
}
A. Hello World
B. World Hello
C. Hello
D. Compilation Error
Answer: C. Hello
Explanation: The concat() method of the String class concatenates the specified string to the end of the current string. However, strings in java are immutable. Therefore, the original string is not modified. Instead, a new string is created. In this case, the original string is "Hello" and the concat() method is called with " World" as the argument. But, since the original string is not modified, the output will be "Hello".
Question 3:
What will be the output of the following code?
public class Main {
public static void main(String[] args) {
try {
int num = 10 / 0;
System.out.println(num);
}
catch(Exception e) {
System.out.println(e.getMessage());
}
}
}
A. NullPointerException
B. Divide by zero
C. ArithmeticException
D. None of the above
Answer: C. ArithmeticException
Explanation: When we divide an integer by zero, it results in an ArithmeticException. In this case, the division is performed inside the try block. Since we are dividing by zero, it will result in an ArithmeticException. Therefore, the catch block will execute and the output will be "java.lang.ArithmeticException: / by zero".
Conclusion:
Java MCQ test is an excellent way to test a candidate's Java programming skills. It is useful in various recruitment processes and academic institutions. As we saw in this article, an MCQ test can cover a wide range of topics such as basic concepts, control statements, data structures, and exception handling. Remember, your fundamentals and practice will play a crucial role in scoring well in a Java MCQ test.
let me elaborate more on the topics covered in the previous section.
Java MCQ Test:
Java MCQ test is an objective type test that evaluates a candidate's Java programming skills through a series of multiple-choice questions. This test is widely used in recruitment processes to assess the candidate's understanding of the language. The MCQ test covers various topics such as data types, control structures, loops, classes, objects, inheritance, abstraction, polymorphism, exception handling, and more. The test can be designed to assess both basic as well as advanced skills.
Preparing for Java MCQ test requires a solid understanding of the fundamentals of Java programming. It is advisable to practice programming with Java, solve programming challenges, and work on real-time projects to gain hands-on experience. Preparing with resources such as books, online tutorials, practice tests is also crucial to get an idea of what to expect on the test day.
Code Examples:
Code examples are an excellent way to learn Java programming concepts. It helps in understanding how the code works, what the program logic is, and how to write more efficient code. The examples covered in the previous section were:
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If-Else Statement: The if-else statement is used to execute a set of statements based on a condition. In the example, the if condition checks if the value of "a" is equal to 11 or not. Since the comparison operator is a post-increment, the value of "a" will be 11 after the comparison. However, the if condition will evaluate to false since the comparison operator is "==" and not "=".
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String Concatenation: The example demonstrates how to concatenate two strings using the concat() method. However, strings in Java are immutable, and the original string is not modified. Instead, a new string is created that is the concatenation of the original string and the string passed as an argument. In the example, the original string is "Hello", and the concat() method is called with " World" as the argument. However, since the original string is not modified, the output will be "Hello".
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Exception Handling: The try-catch block is used to handle exceptions in Java programming. In the example, we are performing division by zero, which results in an ArithmeticException. Since the division is performed inside the try block, it results in an exception. Therefore, the program control will move to the catch block, and the output will be "java.lang.ArithmeticException: / by zero".
In conclusion, Java MCQ test with code examples is an excellent way to assess a candidate's Java programming skills. Preparing well with resources such as books, online tutorials, practice tests and gaining hands-on experience with programming will help boost your performance in the test.
Popular questions
Sure, here are five multiple-choice questions with answers for Java MCQ Test with code examples:
Question 1:
What will be the output of the following code?
public class Main {
public static void main(String[] args) {
int sum = 0;
for(int i = 0; i <= 10; i++) {
sum += i;
}
System.out.println(sum);
}
}
A. 10
B. 45
C. 55
D. 110
Answer: C. 55
Explanation: The for loop runs from 0 to 10 and adds each iteration value to the previous sum. Therefore, the final sum will be the addition of integers from 0 to 10, which is 55.
Question 2:
What is the output of the following code?
public class Main {
public static void main(String[] args) {
String str = "java programming";
System.out.println(str.substring(1, 4));
}
}
A. va
B. jav
C. ava
D. av
Answer: A. va
Explanation: The substring() method of the String class extracts a portion of the string based on the provided arguments. In this example, the substring() method is called with the arguments "1" and "4", which means it will extract the characters from the first index to the (lastIndex-1) index, which is "va".
Question 3:
What will happen when you compile and run the following code?
public class Main {
public static void main(String[] args) {
int x = 10;
int y = 0;
int result = x/y;
System.out.println(result);
}
}
A. The program will compile and run correctly.
B. The program will compile, but it will result in a runtime exception.
C. The program will not compile due to a syntax error.
D. The program will not compile due to a logical error.
Answer: B. The program will compile, but it will result in a runtime exception.
Explanation: In this example, we are performing division by zero, which will result in an ArithmeticException. Since the exception is raised during runtime, the program will compile correctly, but it will result in a runtime exception.
Question 4:
What is the output of the following code?
public class Main {
public static void main(String[] args) {
int num = 25;
if(num < 20) {
System.out.println("Num is less than 20");
}
else if(num < 30) {
System.out.println("Num is between 20 and 30");
}
else {
System.out.println("Num is greater than or equal to 30");
}
}
}
A. Num is less than 20
B. Num is between 20 and 30
C. Num is greater than 30
D. None of the above
Answer: B. Num is between 20 and 30
Explanation: The if-else ladder will check the value of "num" and execute the corresponding block of code. In this example, since "num" is less than 30, but greater than or equal to 20, the output will be "Num is between 20 and 30".
Question 5:
What is the output of the following code?
public class Main {
public static void main(String[] args) {
int arr[] = {1, 2, 3, 4, 5};
for(int x: arr) {
System.out.print(x + " ");
}
}
}
A. 1 2 3 4 5
B. 5 4 3 2 1
C. 1,2,3,4,5
D. None of the above
Answer: A. 1 2 3 4 5
Explanation: The for-each loop or enhanced for loop is used to iterate over an array or a collection. In this example, the for-each loop is used to iterate over the "arr" array and print each element. Therefore, the output will be "1 2 3 4 5".
Tag
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