JAVA CONCEPTS

Important Java Mcq 1

You read the following statement in a Java program that compiles and executes submarine.dive(depth); What can you say for sure?

a. Depth must be an int.

b. Dive must be a method.

c. Dive must be the name of an instance field.

d. Submarine must be a method.

Answer:

b. Dive must be a method.

Explanation

Generally, the syntax is Class.methodname(parameters). Here b options says dive is a method which matches the syntax!

In Java control statements break, continue, return, try-catch-finally, and assert belong to?

a) Select statements b) Loop Statements c) Transfer statements d) Pause Statement Answer c) Transfer statements

Which of the following is a mutable class in java?

a) java.lang.String b) java.lang.Byte c) java.lang.Short d) java.lang.StringBuilder Answer d) java.lang.StringBuilder

Which of the following are not Java keywords?

a) Double b) Switch c) Then d) Instanceof Answer: c) Then

Which of the following are valid array declarations?

a. int number(); b. float average[]; c. counter int[]; d. []double marks; Answer: b. float average[]; Explanation: The correct syntax for declaring an array is