java 15-10-2023

Authored by DEVAKI AMIR

Computers

Professional Development

Used 2+ times

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10 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

public class Test
{
    public Test()
    {
        System.out.printf("1");
        new Test(10);
        System.out.printf("5");
    }
    public Test(int temp)
    {
        System.out.printf("2");
        new Test(10, 20);
        System.out.printf("4");
    }
    public Test(int data, int temp)
    {
        System.out.printf("3");

    }

    public static void main(String[] args)
    {
        Test obj = new Test();

    }

}

12345

Compilation error

Runtime error

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

public class Outer
{
    private int data = 10;

    class Inner
    {
        private int data = 20;
        private int getData()
        {
            return data;
        }
        public void main(String[] args)
        {
            Inner inner = new Inner();
            System.out.println(inner.getData());

        }
    }
    private int getData()
    {
        return data;
    }
    public static void main(String[] args)
    {
        Outer outer = new Outer();
        Outer.Inner inner = outer.new Inner();
        System.out.printf("%d", outer.getData());
        inner.main(args);
    }
}

2010

1020

Compilation Error

None of these

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

class Derived
{
    public void getDetails()
    {
        System.out.printf("Derived class ");
    }
}

public class Test extends Derived
{
    public void getDetails()
    {
        System.out.printf("Test class ");
        super.getDetails();
    }
    public static void main(String[] args)
    {
        Derived obj = new Test();
        obj.getDetails();
    }
}

Test class Derived class

Derived class Test class

Compilation error

Runtime error

FILL IN THE BLANK QUESTION

2 mins • 1 pt

Predict the Output of the following code.
class Clidder
{
    private final void flipper()
    {
        System.out.println("Clidder");
    }
}

public class Clidlet extends Clidder
{
    public final void flipper()
    {
        System.out.println("Clidlet");
    }
    public static void main(String[] args)
    {
        new Clidlet().flipper();
    }
}

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

class Grandparent
{
    public void Print()
    {
        System.out.println("Grandparent's Print()");
    }
}

class Parent extends Grandparent
{
    public void Print()
    {
        System.out.println("Parent's Print()");
    }
}

class Child extends Parent
{
    public void Print()
    {
        super.super.Print();
        System.out.println("Child's Print()");
    }
}

public class Main
{
    public static void main(String[] args)
    {
        Child c = new Child();
        c.Print();
    }
}

Child's Print()

Parent's Print()

Grandparent's Print()

Compiler Error

Answer explanation

Error in in super.super.Print()
It is not allowed to do super.super. We can only access Grandparent’s members using Parent

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

public class Test
{
    private String function()
    {
        return ("GFG");
    }
    public final static String function(int data)
    {
        return ("GeeksforGeeks");
    }
    public static void main(String[] args)
    {
        Test obj = new Test();
        System.out.println(obj.function());
    }
}

Compilation error

Runtime error

GFG

None of these

MULTIPLE CHOICE QUESTION

1 min • 1 pt

class Main {
public static void main(String args[]){
    final int i;
    i = 20;
    i = 30;
    System.out.println(i);
}
}

Compiler Error

Garbage value

Answer explanation

i is assigned a value twice. Final variables can be assigned values only one. Following is the compiler error “Main.java:5: error: variable i might already have been assigned”

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java 15-10-2023

Error in in super.super.Print()
It is not allowed to do super.super. We can only access Grandparent’s members using Parent

class Main {
public static void main(String args[]){
    final int i;
    i = 20;
    i = 30;
    System.out.println(i);
}
}

i is assigned a value twice. Final variables can be assigned values only one. Following is the compiler error “Main.java:5: error: variable i might already have been assigned”

class Test {
   public static void main(String args[]) {
     int arr[2];
     System.out.println(arr[0]);
     System.out.println(arr[1]);
   }
}

it is not allowed to put the size of the array in the declaration because an array declaration specifies only the element type and the variable name. The size is specified when you allocate space for the array.

Final method can’t be overridden. Thus, an abstract function can’t be final.

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java 15-10-2023

class Derived { public void getDetails() { System.out.printf("Derived class "); }} public class Test extends Derived{ public void getDetails() { System.out.printf("Test class "); super.getDetails(); } public static void main(String[] args) { Derived obj = new Test(); obj.getDetails(); }}

Predict the Output of the following code.class Clidder { private final void flipper() { System.out.println("Clidder"); }} public class Clidlet extends Clidder { public final void flipper() { System.out.println("Clidlet"); } public static void main(String[] args) { new Clidlet().flipper(); }}

Error in in super.super.Print()It is not allowed to do super.super. We can only access Grandparent’s members using Parent

public class Test{ private String function() { return ("GFG"); } public final static String function(int data) { return ("GeeksforGeeks"); } public static void main(String[] args) { Test obj = new Test(); System.out.println(obj.function()); }}

class Main { public static void main(String args[]){ final int i; i = 20; i = 30; System.out.println(i); }}

i is assigned a value twice. Final variables can be assigned values only one. Following is the compiler error “Main.java:5: error: variable i might already have been assigned”

public class A extends B{ public static String sing() { return "fa"; } public static void main(String[] args) { A a = new A(); B b = new A(); System.out.println(a.sing() + " " + b.sing()); }}class B{ public static String sing() { return "la"; }}

class Test { public static void main(String args[]) { int arr[2]; System.out.println(arr[0]); System.out.println(arr[1]); }}

it is not allowed to put the size of the array in the declaration because an array declaration specifies only the element type and the variable name. The size is specified when you allocate space for the array.

Final method can’t be overridden. Thus, an abstract function can’t be final.

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class Derived
{
public void getDetails()
{
System.out.printf("Derived class ");
}
}

public class Test extends Derived
{
public void getDetails()
{
System.out.printf("Test class ");
super.getDetails();
}
public static void main(String[] args)
{
Derived obj = new Test();
obj.getDetails();
}
}

Predict the Output of the following code.
class Clidder
{
private final void flipper()
{
System.out.println("Clidder");
}
}

public class Clidlet extends Clidder
{
public final void flipper()
{
System.out.println("Clidlet");
}
public static void main(String[] args)
{
new Clidlet().flipper();
}
}

Error in in super.super.Print()
It is not allowed to do super.super. We can only access Grandparent’s members using Parent

public class Test
{
private String function()
{
return ("GFG");
}
public final static String function(int data)
{
return ("GeeksforGeeks");
}
public static void main(String[] args)
{
Test obj = new Test();
System.out.println(obj.function());
}
}

class Main {
public static void main(String args[]){
final int i;
i = 20;
i = 30;
System.out.println(i);
}
}

public class A extends B
{
public static String sing()
{
return "fa";
}
public static void main(String[] args)
{
A a = new A();
B b = new A();
System.out.println(a.sing() + " " + b.sing());
}
}
class B
{
public static String sing()
{
return "la";
}
}

class Test {
public static void main(String args[]) {
int arr[2];
System.out.println(arr[0]);
System.out.println(arr[1]);
}
}