Question

Given the following problem, explain what instance variables and methods you would create, what parameters would be sent to each method (if any) and what values would be returned (if any), and an overview of what the method will do. You should explain why you have chosen to break the problem down as you have.

You are required to write a program in JAVA which will fill an array with names entered by the user. You must be able to output the list on one line in proper order, and also in reversed order on one line. As well, you should be able to search for a name in the list (entered by the user in the main method) and send the position number of the value back to the main method for future use.

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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// StringArray.java

public class StringArray {
   //Declaring instance variables
   private String arr[] = null;

   /**
   * @param arr
   */
   public StringArray(String[] arr) {
       this.arr = arr;
   }

   //This method will display the array elements
   public void displayArray() {
       for (int i = 0; i < arr.length; i++) {
           System.out.println(arr[i]);
       }
   }

   //This method will reverse the order of array elements
   public void reverseArray() {
       String temp;
       // Reverse array
       for (int index = 0; index < arr.length / 2; index++) {
           temp = arr[index];
           arr[index] = arr[arr.length - 1 - index];
           arr[arr.length - 1 - index] = temp;
       }
   }

   public int searchWord(String str) {

       for (int i = 0; i < arr.length; i++) {
           if (arr[i].equalsIgnoreCase(str)) {
               return i;
           }
       }
       return -1;
   }
}

=======================================

// Test.java

import java.util.Scanner;

public class Test {
   public static void main(String[] args) {
       String arr[] = null;
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);

       // Getting the input entered by the user
       System.out.print("How many names you want to enter ? ");
       int size = sc.nextInt();
  
       arr = new String[size];

       sc.nextLine();
       for(int i=0;i<size;i++)
       {
           System.out.print("Enter Name#"+(i+1)+":");
           arr[i]=sc.nextLine();
       }
       StringArray sa=new StringArray(arr);
       System.out.println("Displaying the array names :");
       sa.displayArray();
       sa.reverseArray();
       System.out.println("Displaying the array names in reverse order:");
       sa.displayArray();
      
       System.out.print("Enter name to search :");
       String name=sc.nextLine();
       int indx=sa.searchWord(name);
       if(indx==-1)
       {
           System.out.println("The name "+name+" not found in the array.");
       }
       else
       {
           System.out.println("The name "+name+" is found at position "+indx);
       }
      
   }

}

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Output:

How many names you want to enter ? 5
Enter Name#1:Sachin
Enter Name#2:Ricky
Enter Name#3:Patinson
Enter Name#4:James
Enter Name#5:Billy
Displaying the array names :
Sachin
Ricky
Patinson
James
Billy
Displaying the array names in reverse order:
Billy
James
Patinson
Ricky
Sachin
Enter name to search :James
The name James is found at position 1

=====================Could you plz rate me well.Thank You