Java Program: (name this Lab13_Problem4) In main()construct a two-dimensional ar

Question

Java Program: (name this Lab13_Problem4)

In main()construct a two-dimensional array named iVals using this statement (a 5-row, 4-column array):

int iVals[][] = {{1,2,3,4}, {5,6,7,8}, {9,10,10,12}, {9,10,11,12}, {1,27,3,4}};

Also in main(), declare a Boolean variable bDups which will be used to store the return value of the method below.

Write a method fbDupRows() which checks each row against the other rows in the matrix and indicates whether there are duplicates.

A duplicate row is identified when you compare a row against the row below it, column by column. If all the values in each column are the same between each row, then you have a duplicate row. Hint: you need a duplicate counter, which you need to reset to 0 for each row.

When your method completes its examination of the array, return a value of true if any rows are duplicates, false if there are no duplicates.

In main(), examine the return value and display either:

Duplicate Rows Found

or

No Duplicate Rows Found

Explanation / Answer

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class DuplicateRows
{
   public static boolean fbDupRows(int[][] arr)
   {
       int count = 0;
       int row = arr.length;
       int col = arr[0].length;
       boolean result = false;
       for(int i=1;i<row;i++)
       {
           for(int j=0;j<col;j++)
           {
               if(arr[i-1][j]==arr[i][j])
                   count++;
           }
           if(count==col)
               result = true;
           else
               count = 0;
       }
      
       return result;
   }
  
   public static void main (String[] args) throws java.lang.Exception
   {
       // your code goes here
       int[][] iVals = {{1,2,3,4}, {5,6,7,8}, {9,10,10,12}, {9,10,11,12}, {1,27,3,4}};
       boolean bDups = fbDupRows(iVals);
       if(bDups==true)
           System.out.println("Duplicate Rows Found");
       else
           System.out.println("Duplicate Rows not Found");
   }
}

Related Questions

Navigate

• Browse (All)
• Browse J
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.