JAVA CONCEPTS

Important Java Mcq 1

The conditional AND operator in java, c++, and c# is ____.

a. |

b. &

c. ||

d. &&

Answer:

d. &&

Explanation:

&& is the conditional AND operator used in Java, C++ and C#.

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 is true regarding Java classes?

a. All classes must have 1 parent but may have many any number of children classes. b. All classes must have 1 child class but

In java declaring a class abstract is useful

a. To prevent developers from further extending the class. b. When default implementations of some methods are not desirable. c. When it doesn’t make sense

Which JDK command is correct to run a Java application in bytecode.class?

a. java ByteCode b. java ByteCode.class c. javac ByteCode.class d. JAVAC ByteCode.class Answer: a. java ByteCode Explanation After creating a .class file, in order to