Skip to main content

Important Web Design and Development Short Questions

Chapter: 2
Question 1:
What is the significance of the 'public static void main(String[] args)' method in Java?
Answer: The 'main' method is the entry point of a Java program, made public and static so that the JVM can invoke it without creating an object of the class. It takes an array of strings as arguments and does not return a value (void).
Chapter: 2
Question 2:
What happens during the "Execute" phase of a Java program?
Answer: During the Execute phase, the JVM interprets the bytecode into machine code, performing the actions specified by the program in real-time.
Chapter: 2
Question 3:
Why is it important to recompile a Java class after making changes?
Answer: Recompilation is necessary because any changes made to the source code need to be reflected in the bytecode, which the JVM executes.
Chapter: 2
Question 4:
What is the role of the JRE in running Java programs?
Answer: The JRE (Java Runtime Environment) provides the necessary environment, including the JVM and core libraries, for running Java programs on any operating system.
Chapter: 3
Question 5:
What is a string in Java?
Answer: A string in Java is a sequence of characters stored in memory and accessible as a unit. It is represented as an object in Java.
Chapter: 3
Question 6:
How do you concatenate strings in Java?
Answer: In Java, strings can be concatenated using the + operator. For example, System.out.println("Hello" + "World") will print HelloWorld on the console.
Chapter: 3
Question 7:
What happens when a string is concatenated with an integer in Java?
Answer: When a string is concatenated with an integer in Java, the integer is converted to a string, and the result is a concatenated string. For example, System.out.println("Hello" + 4) will print Hello4 on the console.
Chapter: 3
Question 8:
What is the difference between using == and equals() to compare strings in Java?
Answer: The == operator compares the memory addresses (shallow comparison) of the strings, while the equals() method compares the actual content (deep comparison) of the strings.
Chapter: 3
Question 9:
How are command-line arguments passed to a Java program?
Answer: Command-line arguments are passed to a Java program as an array of strings (the args array) in the main method. Each argument is separated by a space.
Chapter: 3
Question 10:
What is the output of the following code: System.out.println(i + j); where int i = 4; and int j = 5;?
Answer: The output of the code will be 9 because both i and j are integers, so their values are added together.