Java language Test-1

1.Which of following option leads to the portability and security of java?

• Bytecode is executed by JVM

• The applets make the java code secure and portable

• Use of expectations handing

• None of these

2.______is used to find and fix bugs in the java program.

• JRE

• JVM

• JDB

• JDK

3.Which of following is valid declaration of a char?

• Char cr=\u0223;

• Char cr=\v0223

• Char ch='\utea';

• None of these

4.Evaluate the following java expression,if x=3,y=5 and z=10:

++z+y-y+z+x++

• 34

• 20

• 22

• 24

5.Which of the following is not a java features?

• Dynamic

• Architecture Neutral

• Use of pointer

• Object -Oriented

6.Which of following tool is used to generate API documentation in HTML format from doc comments in source code?

• Java tool

• Javadoc tool

• Javaw command

• Java documentation

7.Which of following is true about the anonymous inner class?

• It has only method

• It has no class name

• Object can't be created

• Java object method

8.What guarantees type safety in a collection?

• Generics

• Abstract classes

• Collection

• None of these

9.Hashset internally uses?

• Hash map

• Set

• List

• Collection

10.The most used interfaces from the collection framework are..?

• List

• Map

• Set

• Data