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42. When does an object become subject to garbage collection? Describe using a Java example (show code). 43. What is the main difficulty in users performing their own free storage management? 44. What...

42. When does an object become subject to garbage collection? Describe using a Java example (show code).

43. What is the main difficulty in users performing their own free storage management?

44. What language allows users to perform their own free storage management?

45. What is overloading? Describe using java code showing an example of overloading.

46. Why would we desire to overload functions? Describe using a Java example (show code).

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Answer #1

42.When does an object become subject to garbage collection? Describe using a Java example .

Object created inside a method : When a method is called it goes inside the stack frame. When the method is popped from the stack, all its members dies and if some objects were created inside it then these objects becomes unreachable or anonymous after method execution and thus becomes eligible for garbage collection
.Example:

* Java program to demonstrate that

objects created inside a method will becomes

eligible for gc after method execution terminate */

  

class Test

{

      

    // to store object name

    String obj_name;

      

    public Test(String obj_name)

    {

        this.obj_name = obj_name;

    }

      

    static void show()

    {

        //object t1 inside method becomes unreachable when show() removed

        Test t1 = new Test("t1");

        display();

          

    }

    static void display()

    {

        //object t2 inside method becomes unreachable when display() removed

        Test t2 = new Test("t2");

    }

      

    // Driver method

    public static void main(String args[])

    {

        // calling show()

        show();

          

        // calling garbage collector

        System.gc();

    }

      

    @Override

    /* Overriding finalize method to check which object

    is garbage collected */

    protected void finalize() throws Throwable

    {

        // will print name of object

        System.out.println(this.obj_name + " successfully garbage collected");

    }

}

Actually, it is the implementation that is system dependent. And until very recently, there was no unique solution to answer this question

43.The main difficulty in own frree space storage management is system dependent their we need to know all

low level details of system hardware like devide drivers for memory , hardware details of memory etc os used in system

44.the language which allow love level access to hardware ,allow us own free space storage management .

   language like c ,c++ etc.

45.What is overloading?

Overloading allows different methods to have the same name, but different signatures where the signature can differ by the number of input parameters or type of input parameters or both. Overloading is related to compile time (or static) polymorphism.

/ Java program to demonstrate working of method

// overloading in Java.

  

public class Sum {

  

    // Overloaded sum(). This sum takes two int parameters

    public int sum(int x, int y)

    {

        return (x + y);

    }

  

    // Overloaded sum(). This sum takes three int parameters

    public int sum(int x, int y, int z)

    {

        return (x + y + z);

    }

    // Overloaded sum(). This sum takes two double parameters

    public double sum(double x, double y)

    {

        return (x + y);

    }

  

    // Driver code

    public static void main(String args[])

    {

        Sum s = new Sum();

        System.out.println(s.sum(10, 20));

        System.out.println(s.sum(10, 20, 30));

        System.out.println(s.sum(10.5, 20.5));

    }

}

46.Why would we desire to overload functions?

the use of function overloading is to save the memory space,consistency and readabiliy.

It speeds up the execution of programme.

Function overloading is done for code re-usability, to save efforts, and also to save memory.

It helps app to load the class method based on the type of parameter

Code maintenance is easy.

public class Test

{

    // Overloaded methods

    public void fun(Integer i)

    {

        System.out.println("fun(Integer ) ");

    }

    public void fun(String name)

    {

        System.out.println("fun(String ) ");

    }

  

    // Driver code

    public static void main(String [] args)

    {

        Test mv = new Test();

  

        // This line causes error

        mv.fun(null);

    }

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