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Master Your Next Job Interview with These 10 POWERFUL Java Interview Questions – Can You Ace the Quiz ?

Java Interview Questions

Java Interview Questions
Java Interview Questions
Interview Question Quiz – 2

Interview Question Quiz – 2

Question 1: Which design pattern is used to restrict the instantiation of a class to one single instance and provides a global point of access to that instance?

Question 2: What is the purpose of the `transient` keyword when applied to a Java class field?

Question 3: Which of the following statements is true about Java interfaces?

Question 4: What is the output of the following code snippet?

int x = 5;
int y = 10;
x += (y < 10) ? 2 : 3;
System.out.println(x);

Question 5: In Java, which exception is thrown when an array is accessed with an index that is out of bounds?

Question 6: What is the purpose of the `super` keyword in Java?

Question 7: Which Java collection class allows duplicate elements and maintains the insertion order?

Question 8: What is the default value of instance variables (non-primitive types) in Java?

Question 9: Which Java feature is used to manage and automate the memory allocation and deallocation?

Question 10: What is the primary purpose of the `equals()` method in Java?

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Java Interview Questions
Java Interview Questions

Explanation for Java Interview Questions

Answers and Explanations :Java Interview Questions

  1. Answer: A) Singleton Explanation: The Singleton design pattern ensures that a class has only one instance and provides a global point of access to that instance.
  2. Answer: B) It specifies that the field should not be serialized. Explanation: The transient keyword is used to specify that a field should not be serialized when an object of the class is serialized.
  3. Answer: C) Interfaces can extend multiple other interfaces. Explanation: In Java, interfaces can extend multiple other interfaces, allowing for multiple inheritance of interface types.
  4. Answer: C) 8 Explanation: The expression (y < 10) ? 2 : 3 evaluates to 3 since y is not less than 10. Therefore, x becomes 5 + 3, which is 8.
  5. Answer: B) IndexOutOfBoundsException Explanation: Java throws IndexOutOfBoundsException when an array is accessed with an index that is out of bounds.
  6. Answer: B) It is used to access the superclass’s instance variables and methods. Explanation: The super keyword is used to access the superclass’s instance variables and methods in a subclass.
  7. Answer: C) ArrayList Explanation: ArrayList allows duplicate elements and maintains the insertion order of elements.
  8. Answer: A) null Explanation: The default value of non-primitive type instance variables in Java is null.
  9. Answer: D) Garbage Collection Explanation: Garbage Collection is a Java feature that automatically manages memory allocation and deallocation by identifying and freeing up memory occupied by objects no longer in use.
  10. Answer: B) To compare two objects for equality based on their contents Explanation: The equals() method is typically overridden in Java classes to compare two objects for equality based on their contents, not their references.

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