Java Test

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There are 12 questions to complete in this free Java test. The test does not have a time limit but it should take no more than 6 minutes to complete.

Summary of Java Test
This quiz includes questions related to Classes, Java interfaces, functions, substrings, containers, threads and garbage collection. Start Congratulations - you have completed Java Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

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Question 1

Which one of the following is true about String Class in java?

	Java String class is constant
	Java String class is final
	Java String class is static
	Java String class is private

Question 2

This question is about implementation of Interface’s in java. Which one of the following is true about Getname()

public interface students
{
void Getname();
}

	Getname() could be "friendly" or public
	Getname() cannot be synchronized as it is not in the signature of the interface definition
	Getname() must be public
	The code is insufficient to give the answer

Question 3

This question is about trim() in java. Please read the following code and select the correct option

If("String".trim().equals("String"))
System.out.println("Equal");
else
System.out.println("Not Equal");

	The output of this code is “Not Equal”
	The output of this code is “Equal”
	This code will generate an exception
	This code will give compile time error

Question 4

This question is about an anonymous inner class in java. Please select the correct answer from the following:

	An Anonymous inner class does not have a constructor
	An Anonymous inner class can implement Interface
	An Anonymous inner class can extend a non-final class
	All of the above are true

Question 5

This question is about a substring() in java. Please read the following code and select the correct option:

System.out.println("String".substring(0,4));

	The output will be “trin”
	The output will be “Stri”
	This code will generate an exception
	This code will cause a compile error

Question 6

How will you change the current layout manager for a container in java

	By using the setLayoutManager method
	By using the updateLayout method
	It cannot be changed.
	By using the setLayout method

Question 7

This question is about the GridBagConstraints in java. Which of the following is/are fields of GridBagConstraints

	ipad
	empty
	insets
	All of the above are correct

Question 8

This question is about Java Map. Which statement is true about Java Map.

	It is an interface which ensures that implementing classes cannot contain duplicate keys
	It is a class which contains unique vector elements
	It is a class which contains unique array elements
	It is an array vector for 3D geographical representation

Question 9

This question is about the threads implementation in java. What can ensure a thread stops executing?

	There is a call which halts the method of the thread class
	A low priority thread is invoked
	A call to the thread's stop method
	All of the above are correct

Question 10

This question is about garbage collection in java. Which of the following is the correct syntax for suggesting that the JVM performs garbage collection?

	System.gc()
	System.getgarbage()
	System.out.gc()
	Out.gc()

Question 11

What will be output of the following code?

System.out.println(010|4);

	It will give an exception
	This code will result in a compile time error
	12
	14

Question 12

This question is about the post and pre increment in java. What will be the output of the following code?

	Int i=0;
	Int d= ++i+i+5+i+++i;
	8
	10
	This will generate compile time error.

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