Java Basic Quiz - 4

Java Basics Quiz 4

Time left: 10:00

1. What is the correct way to create a new instance of a class in Java?

• ClassName obj = new ClassName();
• ClassName obj = ClassName.new();
• ClassName obj = new();
• ClassName obj = ClassName();

2. What is the correct syntax to create a new array in Java?

• int[] arr = new int[5];
• int arr = new int[5];
• int[] arr = new int(5);
• int arr = new int(5);

3. What is the correct way to inherit a class in Java?

• class SubClass extends SuperClass
• class SubClass implements SuperClass
• class SubClass inherits SuperClass
• class SubClass inherits SuperClass

4. What is the output of the following code?

                int[] arr = {1, 2, 3, 4, 5};
                System.out.println(arr[2]);
            

• 1
• 2
• 3
• 4

5. What is the correct syntax for a multi-line comment in Java?

• // comment
• /* comment */
• # comment #

6. What is the output of the following code?

                int x = 5;
                int y = 10;
                int z = x + y;
                System.out.println(z);
            

• 5
• 10
• 15
• 20

7. What is the correct way to call a static method in Java?

• ClassName.methodName();
• objectName.methodName();
• methodName();
• None of the above

8. What is the default value of a boolean variable in Java?

• true
• false
• 0
• 1

9. What is the purpose of the "this" keyword in Java?

• To refer to the current object instance
• To refer to a static member
• To refer to a superclass
• None of the above

10. Which of the following statements is true about Java?

• Java is a platform-dependent language
• Java supports multiple inheritance through classes
• Java is a statically-typed language
• Java does not support polymorphism