Question 1

What is the output of following piece of code ?

int x = 2;
 switch (x) {
 case 1:System.out.println("1?);
 case 2:
 case 3:System.out.println("3?);
 case 4:
 case 5:System.out.println("5?);
 }

java

No output
3 and 5
1, 3 and 5
3

Answer

Correct Option: B,D

Question 2

A method is defined in a class as : void processUser(int i) { } If this method is overriden in a sub class,_

java

the new method should return int
the new method can return any type of values
the argument list of new method should exactly match that of overriden method
the return type of new method should exactly match that of overriden method

Answer

Correct Option: C

Question 3

A Vector is declared as follows. What happens if the code tried to add 6 th element to this Vector new vector(5,10)

java

The element will be successfully added
ArrayIndexOutOfBounds Exception
The Vector allocates space to accommodate up to 15 elements
none of these

Answer

Correct Option: A,C

Question 4

A class can be converted to a thread by implementing the interface ___.

java

Thread
Runnable
Both of these
none of these

Answer

Correct Option: B

Question 5

Given:

TreeSet map = new TreeSet();
 map.add("one");
 map.add("two");
 map.add("three");
 map.add("four"};
 map.add("one");
 Iterator it = map.iterator();
 while (it.hasNext() ) {
 System.out.print( it.next() + " " );
 }

java

Compilation fails
one two three four
four three two one
four one three two
one two three four one
one four three two one

Answer

Correct Option: D

Question 6

Which is true about a method-local inner class?

java

It must be marked final
It can be marked abstract
It can be marked public
It can be marked static

Answer

Correct Option: B

Question 7

Which is true about an anonymous inner class?

java

It can extend exactly one class and implement exactly one interface
It can extend exactly one class and can implement multiple interfaces
It can extend exactly one class or implement exactly one interface
It can implement multiple interfaces regardless of whether it also extends a class
It can implement multiple interfaces if it does not extend a class

Answer

Correct Option: C

Question 8

Which is true?

java

The java command can access classes from more than one package, from a single JAR file.
JAR files can be used with the java command but not with the javac command.
In order for JAR files to be used by java, they MUST be placed in the /jre/lib/ext sub-directory within the J2SE directory tree.
When a part of a directory tree that includes subdirectories with files is put into a JAR file, all of the files are saved in the JAR file, but the subdirectory structure is lost.

Answer

Correct Option: A

Question 9

Which of the following statement is true?

java

X extends Y is correct if and only if X is a class and Y is an interface
X extends Y is correct if and only if X is an interface and Y is a class
X extends Y is correct if X and Y are either both classes or both interfaces
X extends Y is correct for all combinations of X and Y being classes and/or interfaces.

Answer

Correct Option: C

Description: Java Programming Language Quiz - 4
Number of Questions: 9
Created by: Aliensbrain Bot
Tags: java

Java Programming Language Quiz - 4

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