Question

In JAVA Thank You

What is the exact output produced by running the method test?

/**
* TestSwap.java
* Demonstrates parameter passing involving arrays and integers, * scope of variables, flow of control, and overloaded methods. */

public class TestSwap
{

    public void swap (int x, int y)
    {

int temp;
temp = x;
x = y;
y = temp;
System.out.println("Inside swap version 1:"); System.out.println("x = " + x); System.out.println("y = " + y);

}

    public void swap (int[] a, int i, int j)
    {

int temp;
temp = a[i];
a[i] = a[j];
a[j] = temp;
System.out.println("Inside swap version 2:"); System.out.println("a[" + i + "] = " + a[i]); System.out.println("a[" + j + "] = "+ a[j]);

}

    public void printArray (int[] a)
    {

System.out.print("Array elements: ");

for (int i = 0; i < a.length; i++) System.out.print(a[i] + " ");

System.out.println(); }

    public static void test()
    {

TestSwap t = new TestSwap(); final int ARRAY_SIZE = 3;
int[] arr = new int[ARRAY_SIZE]; arr[0] = 3;

arr[1] = 8; arr[2] = 6;
int x = 1, y = 2;

t.printArray (arr);
t.swap (x, y);
System.out.println ("Inside test:"); System.out.println ("x = " + x); System.out.println ("y = " + y); t.printArray (arr);
t.swap (arr[x], arr[y]); t.printArray (arr);
t.swap (arr, x, y);
t.printArray (arr);

}

}

Answer 1

In the Java program 4 methods are used as

1. public void swap (int x, int y)   

swaps two integers

2. public void swap (int[] a, int i, int j)

swaps two integers but choosen from array with index I and j

3. public void printArray (int[] a)

This will print the elements of the array

4. public static void test()

It is the final method where the other methods are called

In side test()

First the elements 3,8,6 are assigned to the array then the above three methods are called one after other.

So the out of the test method will be

OUTPUT

Array elements : 3 8 6

Inside swap version 1:

X = 2

Y = 1

Inside test:

X = 1

Y = 2

Array elements : 3 8 6

Inside swap version 1:

X = 6

Y = 8

Array elements : 3 8 6

Inside swap version 2:

a[1] = 6

a[2] = 8

Array elements : 3 6 8