JAVA CONCEPTS

Important Java Mcq 1

Which of the following is one of the valid statements?

a. char[] c = new char();

b. char[] c = new char(4);

c. char[] c = new char[];

d. char[] c = new char[5];

Answer:

d. char[] c = new char[5];

Explanation:

The syntax for declaring an array is dataType[] arrName = new dataType[array Size]; only the d option satisfies the syntax of array declaration. So, d is the right choice.

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