Question

Program must be OOP design.  

1. Prompt the user to enter 10 doubles and fill an array
2. Print the array
3. Fill an array with 10 random numbers and print the array
4. Sort the array -- then print
5. Delete index[ 3] of the array and re-print the array

JAVA

This is my program so far. I am having trouble with my delete element method.

import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;


public class ArrayPlay {

    Random rand = new Random();//assign random number variable
    private double[] tenNumArray = new double[10];//initiate array containing 10 doubles.

    Scanner input = new Scanner(System.in);//create new scanner


    public Random getRand() {
        return this.rand;
    }

    public void setRand(Random rand) {
        this.rand = rand;
    }

    public double[] getTenNumArray() {
        return this.tenNumArray;
    }

    public void setTenNumArray(double[] tenNumArray) {
        this.tenNumArray = tenNumArray;
    } //end getters//setters

    //begin method
    public void fillArrayAndDisplay() {//begin prompt User method

        // #1 Prompt the user to enter 10 doubles and fill an array
        System.out.println("Enter ten elements to fill the array");
        for (int i = 0; i < this.tenNumArray.length; i++) {//for index equals 1 count plus 1 to 10
            this.tenNumArray[i] = input.nextDouble();//placing values index values into the array
        }//end for loop

        // #2 Print array
        System.out.println("The Numbers you entered into the array are");
        System.out.printf(Arrays.toString(this.tenNumArray)); // displays user filled array
    }//ends prompt User and print method


    // #3 Fill an array with 10 random numbers and print the array
    public void randomArrayAndDisplay() {   //begins random numbers and display array
        for (int i = 0; i < this.tenNumArray.length; i++) {
            this.tenNumArray[i] = rand.nextInt(10);//create the random numbers using Random class object. set to 10
        }
        System.out.println("\n The Randomly generated numbers are; ");
        System.out.printf(Arrays.toString(this.tenNumArray)); // displays random numbers
    }//ends random array and display method

    //  4. Sort the array -- then print
    public void sortNumberAndDisplay() {

        Arrays.sort(this.tenNumArray); //replaces your whole sort function
        System.out.println("\n The random numbers sorted are: ");
        System.out.printf(Arrays.toString(this.tenNumArray)); // replaces your display line
       }// end sort array method

    // #5. Delete index[ 3] of the array and re-print the array
    //begin delete element method
    public void deleteArrayElements(int index) {
        // If the array is empty
        // or the index is not in array range
        // return the original array
        if (this.tenNumArray == null
                || index >= this.tenNumArray.length || index < 0) {
            System.out.println("\n\n No deletion operation can be performed\n\n");

        } else {
            double[] tempArray = new double[this.tenNumArray.length - 1];

            // Copy the elements except the index
            // from original array to the other array
            for (int i = 0, k = 0; i < this.tenNumArray.length; i++) {

                // if the index is
                // the removal element index
                if (i == index) {
                    continue;
                }

                // if the index is not
                // the removal element index
                tempArray[k++] = this.tenNumArray[i];
            }

            // return the resultant array
            System.out.println(tempArray[4] + " \n delete num " + " ");

        }


    }

    public void loop(){
        fillArrayAndDisplay();//runs prompt user
        randomArrayAndDisplay();
        sortNumberAndDisplay();
        deleteArrayElements(3);//delete index 3
    }

}

Answer 1

Here is the solution,

I have done the required modification in the deleteArrayElements Method. Also generating values from 0 to 100

for better understanding whether the right element it getting deleted or not.

Added the main function for testing purpose

// your code starts here
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class ArrayPlay {

Random rand = new Random();//assign random number variable
private double[] tenNumArray = new double[10];//initiate array containing 10 doubles.

Scanner input = new Scanner(System.in);//create new scanner

public Random getRand() {
return this.rand;
}

public void setRand(Random rand) {
this.rand = rand;
}

public double[] getTenNumArray() {
return this.tenNumArray;
}

public void setTenNumArray(double[] tenNumArray) {
this.tenNumArray = tenNumArray;
} //end getters//setters

//begin method
public void fillArrayAndDisplay() {//begin prompt User method

// #1 Prompt the user to enter 10 doubles and fill an array
System.out.println("\nEnter ten elements to fill the array");
for (int i = 0; i < this.tenNumArray.length; i++) {//for index equals 1 count plus 1 to 10
this.tenNumArray[i] = input.nextDouble();//placing values index values into the array
}//end for loop

// #2 Print array
System.out.println("\nThe Numbers you entered into the array are");
System.out.printf("\n" + Arrays.toString(this.tenNumArray)); // displays user filled array
}//ends prompt User and print method

// #3 Fill an array with 10 random numbers and print the array
public void randomArrayAndDisplay() { //begins random numbers and display array
for (int i = 0; i < this.tenNumArray.length; i++) {
this.tenNumArray[i] = rand.nextInt(100);//create the random numbers using Random class object. set to 10
}
System.out.println("\n\n The Randomly generated numbers are; ");
System.out.printf("\n" + Arrays.toString(this.tenNumArray)); // displays random numbers
}//ends random array and display method

// 4. Sort the array -- then print
public void sortNumberAndDisplay() {

Arrays.sort(this.tenNumArray); //replaces your whole sort function
System.out.println("\n\n The random numbers sorted are: ");
System.out.printf("\n" + Arrays.toString(this.tenNumArray)); // replaces your display line
}// end sort array method

// #5. Delete index[ 3] of the array and re-print the array
//begin delete element method
public void deleteArrayElements(int index) {
// If the array is empty
// or the index is not in array range
// return the original array
if (this.tenNumArray == null
|| index >= this.tenNumArray.length || index < 0) {
System.out.println("\n\n No deletion operation can be performed\n\n");

} else {
double[] tempArray = new double[this.tenNumArray.length - 1];

// Copy the elements except the index
// from original array to the other array
for (int i = 0, k = 0; i < this.tenNumArray.length; i++) {

// for deleting the element with index value 3
// if i == index then we will skip it from copying it to temp
if (i == index) {
continue;
}

//copying all the other elements other than index 3 in temp array
tempArray[k++] = this.tenNumArray[i];
}
  
System.out.println("\n Element deleted : " + this.tenNumArray[index] + " at index value 3");
// make the tenNumArray to point to the new generated array i.e tempArray
this.tenNumArray = tempArray;
// return the resultant array
System.out.println("\n" + Arrays.toString(this.tenNumArray));

}

}

public void loop(){
fillArrayAndDisplay();//runs prompt user
randomArrayAndDisplay();
sortNumberAndDisplay();
deleteArrayElements(3);//delete index 3
}
// for testing i have added the code in the main function
public static void main(String[] args) {
ArrayPlay a = new ArrayPlay();
a.loop();
}

}
//code ends here

here is the sample output:-

Thank You.