Question

1. Design and implement a class called RandomArray, which has an integer array. The constructor receives the size of the array to be allocated, then populates the array with random numbers from the range 0 through the size of the array. Methods are required that return the minimum value, maximum value, average value, and a String representation of the array values. Document your design with a UML Class diagram. Create a separate driver class that instantiates a RandomArray object and outputs its contents and the minimum, maximum, and average values.

Answer 1

code

RandomArray.java class

public class RandomArray
{
private int []arr;

public RandomArray(int size)
{
arr=new int[size];
int max = size;
int min = 0;
int range = max - min + 1;
for(int i=0;i<size;i++)
arr[i]=(int)(Math.random() * range) + min;
}
public int minimum()
{
int min=arr[0];
for(int i=1;i<arr.length;i++)
if(min>arr[i])
min=arr[i];
return min;
}
public int maximum()
{
int max=arr[0];
for(int i=1;i<arr.length;i++)
if(max<arr[i])
max=arr[i];
return max;
}
public double average()
{
double sum=0;
for(int i=0;i<arr.length;i++)
sum+=arr[i];
return sum/arr.length;
}

@Override
public String toString() {
String str="";
for(int i=0;i<arr.length-1;i++)
str+=arr[i]+",";
str+=arr[arr.length-1];
return "Array is ["+str+"]";
}
  
}

Driver class

TestRandomArray.java file

public class TestRandomArray {

public static void main(String[] args) {
RandomArray arr1=new RandomArray(7);
  
System.out.println(arr1);
System.out.println("Minimum element is : "+arr1.minimum());
System.out.println("Minimum element is : "+arr1.maximum());
System.out.println("Average of the array is : "+arr1.average());
}
  
}

output

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