JAVA_Viva_Questions And Answers 2022

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1. Which is true? A. "X extends Y" is correct if and only if X is a class and Y is an interface B. "X extends Y" is correct if and only if X is an interface and Y is a class C. "X extends Y" is cor... rect if X and Y are either both classes or both interfaces D. "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces 2. Which of the following is true? 1 A class can extend more than one class. 2. A class can extend only one class but many interfaces. 3. An interface can extend many interfaces. 4. An interface can implement many interfaces. 5. A class can extend one class and implement many interfaces. A. 1 and 2 B. 2 and 4 C. 3 and 5 D. 3 and 4 E. 2 and 5 3. How many primitive data types are there in Java? A. 6 B. 7 C. 8 D. 9 4. In Java byte, short, int and long all of these are A. signed B. unsigned C. Both of the above D. None of these 5. Size of int in Java is A. 16 bit B. 32 bit C. 64 bit D. Depends on execution environment 6. What is the output of the following program? public class Test{ static int x = 10 ; public static void main(String[] a){ Test test = new Test( ) ; Test test1 = new Test( ) ; test.x += 1 ; System.out.println( test.x + test1.x ) ; } } A. 20 B. 21 C. 22 D. Compilation Error E. Throws Exception 7. Which of the following is not a Java features? a) Dynamic b) Architecture Neutral c) Use of pointers d) Object-oriented 8. Which of the following is a valid declaration of a char? a) char ch = '\utea'; b) char ca = 'tea'; c) char cr = \u0223; d) char cc = '\itea [Show More]

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