Question

Java question

Q1) Use the following code snippet which generates a random sized array with random contents to complete the following problems:

public int [] createRandomArray() {

        int size = (int) (Math.random() * 10) + 1;

        int[] array = new int [size];

        for (int i = 0; i < array.length; i++) {

            array[i] = (int) (Math.random() * 10 ) + 1;

        }

        return array;

    }

Assignment name: ArrayManiuplation2 Write a program which has the following methods:

1. Takes in an integer array as parameter and returns the sum of all the even numbers in the array.

2. Takes in an integer array as parameter and returns the difference between the largest number of the array and the smallest number of the array.

3. Takes in an integer array and prints out each even number as it encounters it.

4. Takes in an integer array and determines whether the last element and the first element are equal to one another. Returns a boolean.

5. Takes in an integer array as a parameter determines if the number 2 is an element.

6. Write a driver class in another file which exercises all the methods that you created.

Q2) Assignment name: MultiDimensionArrays

Write a program which populates a 5x5 two dimensional array with random integers. Write a driver class which prints out each element in the 2D array.

Answer 1

Q1)

Code

All the methods area written in the ArrayManiuplation2.java
public class ArrayManiuplation2
{
public int [] createRandomArray()
{
int size = (int) (Math.random() * 10) + 1;
int[] array = new int [size];
for (int i = 0; i < array.length; i++)
{
array[i] = (int) (Math.random() * 10 ) + 1;
}
return array;
}
public int sumEven(int []a)
{
int sum=0;
for(int i=0;i<a.length;i++)
sum+=a[i];
return sum;
}
public int diffLargestSmallesy(int []a)
{
int max=a[0];
int min=a[0];
for(int i=1;i<a.length;i++)
{
if(max<a[i])
max=a[i];
if(min>a[i])
min=a[i];
}
return max-min;
}
public void printEven(int []a)
{
for(int i=0;i<a.length;i++)
if(a[i]%2==0)
System.out.print(a[i]+" ");
}
public boolean checkFirstLastElement(int []a)
{
return a[0]==a[a.length-1];
}
public boolean check2Element(int []a)
{
for(int i=0;i<a.length;i++)
if(a[i]==2)
return true;
return false;
}
}

Main.java that will test all the method that we created above

public class Main {

/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
ArrayManiuplation2 obj = new ArrayManiuplation2();
int []array=obj.createRandomArray();
System.out.println("The array is : ");
for(int i=0;i<array.length;i++)
{
System.out.print(array[i]+" ");
}
System.out.println("\n\nSum of all the even numbers is: "+obj.sumEven(array));
System.out.println("\nThe difference between the largest number and the smallest number of the array: "+obj.diffLargestSmallesy(array));
System.out.println("\nAll the even number in the array are:");
obj.printEven(array);
System.out.println("\nLast anad first element are same ot not? "+obj.checkFirstLastElement(array));
System.out.println("\n2 is the element of the array? "+obj.check2Element(array));
}
  
}

output

Q2)

MultiDimensionArrays.java

public class MultiDimensionArrays
{
int[][] a = new int[5][5];
public int [][] createRandom2DArray()
{
int[][] a = new int[5][5];
for(int i=0;i<5;i++)
for(int j=0;j<5;j++)
a[i][j]=(int) (Math.random() * 10 ) + 1;
return a;
}
}

Driver.java

public class Driver {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
MultiDimensionArrays obj = new MultiDimensionArrays();
int [][]array2D=obj.createRandom2DArray();
System.out.println("2D array with random values is: \n");
for(int i=0;i<5;i++)
{
for(int j=0;j<5;j++)
System.out.print(array2D[i][j]+"\t");
System.out.println("");
}
}
  
}

output

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