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programming languages Online Quiz - 185

Description: programming languages Online Quiz - 185
Number of Questions: 20
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Tags: programming languages
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What is dependency injection?

  1. A pattern (design) whereby collaborators are passed into an object from the outside - the object does not allocate them for itself.

  2. It is a pattern in which the child class inherit the parent class properties

  3. It is a type of operator overloading in java

  4. It represents the compile time and run time polymorphism in java


Correct Option: A

Current version of java is 1.5

  1. True

  2. False


Correct Option: B

The garbage collector will run immediately when the system runs out of memory.

  1. True

  2. False


Correct Option: B

"JAVA" stands for Just Another Virtual Analyser

  1. True

  2. False


Correct Option: B

Is "java.lang.Object" a valid class in java?

  1. True

  2. False


Correct Option: A

Is it OK if a class definition implements two interfaces, each of which has the same definition for a constant PI?

  1. True

  2. False


Correct Option: B

Distributed programming helps in:

  1. balance resource loading

  2. lower cost of development since clients can access remote codes for services

  3. operator overloading

  4. none of these


Correct Option: A,B

How many objects of a given class can there be in a program?

  1. One per defined class.

  2. One per constructor definition.

  3. As many as the program needs.

  4. One per program


Correct Option: C

What command is used to compile a program in Java

  1. javac

  2. java

  3. run java

  4. javas


Correct Option: A

Which is not a java keyword?

  1. for

  2. break

  3. continue

  4. Structure


Correct Option: D

What is an advantage of polymorphism?

  1. The same program logic can be used with objects of several related types.

  2. Variables can be re-used in order to save memory.

  3. Constructing new objects from old objects of a similar type saves time.

  4. Polymorphism is a dangerous aspect of inheritance and should be avoided.


Correct Option: A

What is a method's signature?

  1. The signature of a method is the name of the method the type of its return value.

  2. The signature of a method is the name of the method and the names of its parameters.

  3. The signature of a method is the name of the method and the data types of its parameters.

  4. The signature of a method is the name of the method, its parameter list, and its return type.


Correct Option: D

package polymorphism; class TestSupe { static int p = 100; } public class TestPoly1 extends TestSupe { static int p =1000; public static void main(String[] args) { TestPoly1 TP = new TestPoly1(); TP.p = 400; TestSupe TS = new TestSupe(); TS.p = 300; TestSupe TSP = new TestPoly1(); TSP.p = 500; System.out.print("TestSupe = " + TestSupe.p); System.out.print(" ,TestPoly = " + TestPoly1.p); System.out.print(" ,TP = " + TP.p); System.out.print(" ,TS = " + TS.p); System.out.print(" ,TSP = " + TSP.p); } }

  1. TestSupe = 300 ,TestPoly = 400 ,TP = 400 ,TS = 300 ,TSP = 500

  2. TestSupe = 500 ,TestPoly = 400 ,TP = 400 ,TS = 500 ,TSP = 500

  3. TestSupe = 500 ,TestPoly = 400 ,TP = 400 ,TS = 300 ,TSP = 500

  4. TestSupe = 300 ,TestPoly = 400 ,TP = 500 ,TS = 500 ,TSP = 500


Correct Option: B

package polymorphism;class TestSuperr { double TestPoly(long a, float b, int c) { return ((a + b) * c); }}public class TestPolym extends TestSuperr { double TestPoly(long a, double b, int c) { return (a + b + c); } public static void main(String[] args) { TestSuperr TSU = new TestPolym(); double p = TSU.TestPoly(11, 9, 10); System.out.print("p = " + p); p1 = TSU.TestPoly(11, 9.0, 10); System.out.print(" ,p1 = " + p1); }}

  1. p = 200.0, p1 = 30.0

  2. p = 200.0, p1 = 200.0

  3. p = 30.0, p1 = 30.0

  4. Compiler Error


Correct Option: D

package polymorphism;class TestSup { static int p = 100;}public class TestPoly extends TestSup { public static void main(String[] args) { TestPoly TP = new TestPoly(); TP.p = 400; TestSup TS = new TestSup(); TS.p = 100; TestSup TSP = new TestPoly(); TSP.p = 500; System.out.print("TestSup = " + TestSup.p); System.out.print(" ,TestPoly = " + TestPoly.p); System.out.print(" ,TP = " + TP.p); System.out.print(" ,TS = " + TS.p); System.out.print(" ,TSP = " + TSP.p); }}

  1. TestSup = 100 ,TestPoly = 400 ,TP = 500 ,TS = 500 ,TSP = 500

  2. TestSup = 500 ,TestPoly = 500 ,TP = 500 ,TS = 500 ,TSP = 500

  3. TestSup = 100 ,TestPoly = 400 ,TP = 400 ,TS = 100 ,TSP = 500

  4. TestSup = 500 ,TestPoly = 400 ,TP = 500 ,TS = 100 ,TSP = 400


Correct Option: B

package polymorphism;class TestPolymorphismSuper1 { String name; TestPolymorphism2 testPoly() { TestPolymorphism2 TS = new TestPolymorphism2(); TS.name ="tcs"; return TS; }}public class TestPolymorphism2 extends TestPolymorphismSuper1{ TestPolymorphism2 testPoly() { TestPolymorphism2 TSub = new TestPolymorphism2(); TSub.name = "UX"; return TSub; } public static void main(String[] args) { TestPolymorphismSuper1 TSuper = new TestPolymorphism2(); TSuper.testPoly(); System.out.println(TSuper.name); }}

  1. UX

  2. tcs

  3. null

  4. Exception


Correct Option: C

Which is the correct definition of servlet init parameter in web.xml?

  1. login com.tcs.login.LoginServlet mailId [email protected]

  2. login com.tcs.login.LoginServlet mailId [email protected]

  3. login com.tcs.login.LoginServlet mailId

  4. login com.tcs.login.LoginServlet mailId [email protected]


Correct Option: A

How to define a session time out of 10 minutes in web.xml

  1. 10

  2. 600

  3. 600

  4. 60 session-invalid-time>


Correct Option: A

Which element guarantees a servlet will be loaded on the start up of the web application

  1. true

  2. 1

  3. 0


Correct Option: B

Within a web.xml which maps the servlet com.tcs.login.LoginServlet to the url /utils/LoginServlet

  1. login com.tcs.login.LoginServlet login /utils/L

  2. com.tcs.login.LoginServlet /utils/LoginServlet

  3. com.tcs.login.LoginServlet /utils/LoginServlet

  4. login com.tcs.login.LoginServlet login /utils/LoginServlet


Correct Option: A
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