In this video, we are going to discuss top 35 multiple choice questions. These questions are very important and explains the core concepts on Java.
1.) Which Java exception is thrown when a thread is interrupted while it is in a waiting or sleeping state?
2.) What is the purpose of the default keyword when used in an interface in Java?
3.) Which Java version introduced the var keyword for local variable type inference?
4.) public class Test {
public static void main(String[] args) {
System.out.println("Result: " + 1 + 2);
}
}
5.) Which of the following is not a valid access modifier in Java?
6.) Which data structure in Java is often used for implementing LIFO (Last-In-First-Out) behavior?
7.) In Java, what is the purpose of the java.util.concurrent package?
8.) Which design pattern is used to ensure that a class has only one instance and provides a global point of access to that instance?
9.) int x = 5;
x = x++;
System.out.println(x);
10.) What is the purpose of the volatile keyword in Java?
11.) What does the super keyword do in Java?
12.) What is the purpose of the transient keyword when applied to an instance variable?
13.) What is the purpose of the assert keyword in Java?
14.) What is the purpose of the `try-with-resources` statement in Java?
15.) What is the purpose of the @FunctionalInterface annotation in Java?
16.) What is the difference between `HashMap` and `HashTable` in Java?
17.) In Java, which method is used to define the serialization process for an object?
18.) Which Java 8 feature allows you to iterate over a collection using a lambda expression and perform operations on its elements?
19.) Which Java feature allows you to define a method that can accept a variable number of arguments?
20.) What is the purpose of the `java.util.Optional` class introduced in Java 8?
21.) In Java, which of the following is true about the "volatile" keyword?
22.) Which Java 8 feature allows you to apply a function to each element of a stream and collect the results into a new collection?
23.) What is the purpose of the `java.util.concurrent.ConcurrentHashMap` class in Java?
24.) Which of the following is not a valid method of synchronization in Java?
25.) Which access modifier allows a variable or method to be accessed from any class in the same package?
26.) What is the result of `10 / 3` in Java?
27.) In Java, what is the purpose of the `break` statement?
28.) What does the `static` keyword indicate in Java?
29.) Which keyword is used to declare a constant in Java?
30.) What is the default value of a boolean variable in Java?
31.) Which loop in Java is used when you want to execute a block of code at least once, even if the condition is false from the start?
32.) Which of the following is a valid way to create an instance of a Java class?
33.) What is the purpose of the `try-catch` block in Java?
34.) What is the purpose of the `java.util.function.Predicate` interface in Java?
35.) In Java, what does the `&&` operator do?
14 окт 2024
