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Inheritance Questions

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1 / 9

Choose the correct option.

Which of the following is a technique for hiding the internal implementation details of an object?


AEncapsulation

BPolymorphism

CInheritance

DAll of the above.

Answer: Option A

Explanation:

Here is no explanation for this answer

Workspace

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66
Solv. Corr.
62
Solv. In. Corr.
128
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2 / 9

Choose the correct option.

In an Object Oriented system, if class A inherits its properties from class B, class A and B are known as _______________ and ___________ class respectively.


ASuper and Sub

Boverloading and overriding

CSub and Super

DNone

Answer: Option C

Explanation:

Here is no explanation for this answer

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22
Solv. Corr.
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Solv. In. Corr.
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What all gets printed when the following program is compiled and run.
public class test {
public static void main(String args[]) {
inti, j=1;
i = (j>1)?2:1;
switch(i) {
case 0: System.out.println(0); break;
case 1: System.out.println(1);
case 2: System.out.println(2); break;
case 3: System.out.println(3); break;
      }
   }
}

A0

B1

C2

D3

EBoth B & C

Answer: Option E

Explanation:

what the fuck!!!  what is the symbol "?"

Workspace

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9
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Solv. In. Corr.
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What is the output for the below code?
import javutil.Iterator;
import javutil.TreeSet;
public class Test {
public static void main(String... args) {
TreeSet s1 = new TreeSet();
s1.add("one");
s1.add("two");
s1.add("three");
s1.add("one");
Iterator it = s1.iterator();
while (it.hasNext() ) {
System.out.print( it.next() + " " );
}
}
}

Aone three two

BRuntime Exception

Cone three two one

Done two three

Answer: Option A

Explanation:

TreeSet assures no duplicate entries.it will return elements in natural order, which, for Strings means alphabetical.

Workspace

NA
SHSTTON
24
Solv. Corr.
32
Solv. In. Corr.
56
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5 / 9

What is the output for the below code?
interface A {
public void printValue();
}
public class Test{
public static void main (String[] args){
A a1 = new A() {
public void printValue(){
System.out.println("A");
 }
 };
 a1.printValue();
 }
 }

ACompilation fails due to an error on line 3

BA

CCompilation fails due to an error on line 8

Dnull

Answer: Option B

Explanation:

The A a1 reference variable refers not to an instance of interface A, but to an instance of an anonymous (unnamed) class. So no compilation error.

Workspace

NA
SHSTTON
15
Solv. Corr.
37
Solv. In. Corr.
52
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0 M:3 S
Avg. Time

6 / 9

What will be the result of compiling and run the following code:
public class Test {
public static void main(String... args) throws Exception {
File file = new File("test.txt");
System.out.println(file.exists());
file.createNewFile();
System.out.println(file.exists());
}
}

Atrue true

Bfalse true

Cfalse false

DNone of the above

Answer: Option B

Explanation:

creating a new instance of the class File, you're not yet making an actual file, you're just creating a filename. So file.exists() return false. createNewFile() method created an actual
file.so file.exists() return true.

Workspace

NA
SHSTTON
7
Solv. Corr.
36
Solv. In. Corr.
43
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7 / 9

What is the output for the below code?
public interface InfA {
protected String getName();
}
public class Test implements InfA{
public String getName(){
return "test-name";
}
public static void main (String[] args){
Test t = new Test();
System.out.println(t.getName());
}
}

Atest-name

BCompilation fails due to an error on lines 2

CCompilation fails due to an error on lines 1

DCompilation succeed but Runtime Exception

Answer: Option B

Explanation:

Illegal modifier for the interface method InfgetName(); only public and abstract are permitted

Workspace

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11
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Solv. In. Corr.
38
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8 / 9

What will be the result of compiling the following code:
public class SuperClass {
public int doIt(String str, Integer... datthrows Exception{
String signature = "(String, Integer[])";
System.out.println(str + " " + signature);
return 1;
}
}
public class SubClass extends SuperClass{
public int doIt(String str, Integer... dat
{
String signature = "(String, Integer[])";
System.out.println("Overridden: " + str + " " +
signature);
return 0;
}
public static void main(String... args)
{
SuperClass sb = new SubClass();
sb.doIt("hello", ;
}
}

AOverridden: hello (String, Integer[])

Bhello (String, Integer[])

CComplilation fails

DNone of the above

Answer: Option C

Explanation:

Unhandled exception type Exception.

Workspace

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What is the output for the below code?
public class A {
public void printName(){
System.out.println("Value-A");
}
}
public class B extends A{
public void printName(){
System.out.println("Name-B");
}
}
public class C extends A{
public void printName(){
System.out.println("Name-C");
}
}
public class Test{
public static void main (String[] args) {
B b = new B();
C c = new C();
b = c;
newPrint(b);
}
public static void newPrint(A {
printName();
}
}

AName-B

BName-C

CCompilation fails due to an error on lines 5

DCompilation fails due to an error on lines 9

Answer: Option C

Explanation:

Reference variable can refer to any object of the same type as the declared reference OR can refer to any subtype of the declared type. Reference variable "b" is type of class B
and reference variable "c" is a type of class So Compilation fails.

Workspace


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