31. Size of float and double in Java is________________?
A. 32 and 64
B. 64 and 64
C. 32 and 32
D. 64 and 32
✅ The correct answer is option A.
Java concepts and its programming MCQs
32. Which type of inheritance is not supported by java_____________?
A. Single
B. Mulilevel
C. Hirarchical
D. Multiple
✅ The correct answer is option D.
33. In java, gc() method is available in which package ?
A. java.io package
B. java.lang package
C. java.awt package
D. java.util package
✅ The correct answer is option B.
34. What is meaning of jar ?
A. java array
B. java architecture
C. java archived
D. none of these
✅ The correct answer is option C.
35. JAR file contains the compressed version of_________________?
A. .java file
B. .jsp file
C. .class file
D. None of above
✅ The correct answer is option C.
36. Which method is used to perform DML statements in JDBC ?
A. executeUpdate()
B. executeQuery()
C. execute()
D. None of above
✅ The correct answer is option A.
37. A package is a collection of__________________?
A. Classes and Interfaces
B. Classes
C. Editing tools
D. Editing tools and Interfaces
✅ The correct answer is option A.
38. What will be output of following program? public class Test{public static void main(String[] args){byte b=127; b++; b++; System.out.println(b); } } ?
A. 127
B. -127
C. 129
D. -129
✅ The correct answer is option B.
39. What will the output of the following program? public class Test{ public static void main(String args[]){float f = (1 / 4) * 10; int i = Math.round(f); System.out.println(i); } } ?
A. 0
B. 1
C. 2
D. 3
✅ The correct answer is option A.
40. What do you mean by javap?
A. java compiler
B. java debugger
C. java Interpreter
D. java Disassemble
✅ The correct answer is option D.