java 13-10-2023

Choose the correct identifier for a method name in Java.

• 1show

• $hide

• *show$

• 3_click

What is the output of any Logical operation in Java?

• 1 or 0

• true or false

• char or String

• None of the above

The method parameters can be redeclared in the method body

• true

• false

The private member of a class can be accessible

• a) Within the class in which it is declared

• b) Within all the sub-classes of its class in any package where this class is visible

• c) Within all the classes in the package containing its class

• both a and b

class c
{
private static int p1=20;
protected static int p2=40;

protected static int func1() {
return p1;
}
}

class testClass extends c{

protected static int func2() {
return p2+func1();
}

public static void main(String[] args ) {
System.out.println(func2());
}
}

• 60

• Compilation error- The field c.p1 is not visible
  

• 40

• 0

Check the below code and state whether it is called Recursion in Java?

void methodA()

{ methodB(); }

void methodB()

{ methodA(); }

• TRUE

• FALSE

Answer explanation

Explanation:

No, not at all. In the above code, the first method calls the second method and the second method calls the first method. 

public class RecursionTesting {

static int num=4;

public static void main(String[] args) {

new RecursionTesting().recursiveMethod(); }

void recursiveMethod() {

num--;

if(num == 0)

return;

System.out.print(num + " ");

recursiveMethod(); } }

• 4 3 2 1

• 3 2 1

• 3 2 1 0

• Compiler error

Answer explanation

Note that this recursive method does not return anything. It simply does the printing of some values.

Public class Constructor8 {

Constructor8(boolean a) {

System.out.println("MODEM="+ a ); }

Constructor8(float a) {

System.out.println("ROUTER=" + a); }

public static void main(String[] args) {

Constructor8 con1 = new Constructor8(50);

Constructor8 con2 = new Constructor8(false); } }

• ROUTER=50.0 MODEM=false

• ROUTER=50 MODEM=false

• Compiler error

• None

public class MethodOverloading1 {

void show(int a, char b)

{ System.out.println("KING KONG"); }

void show(char a, int b)

{ System.out.println("JIM JAM"); }

public static void main(String[] args) {

MethodOverloading1 m = new MethodOverloading1();

m.show(10, 'A');

m.show('B', 10); } }

• JIM JAM

  JIM JAM

• KING KONG

  KING KONG

• KING KONG

  JIM JAM

• compiler error

To successfully overload a method in Java, the method names must be ___.

• Same

• Different

• Same or different

• None