HOW TO PRINT ADJACENT ELEMENTS FOR A GIVEN SQUARE MATRIX - A JAVA SOLUTION

This article describes one of the ways to find the adjacent elements for a particular element in a given square Matrix.

For Example:
String[] A = ["10#20#30", "40#50#60", "70#80#90"]

Its a 3x3 matrix whose order is 3.

Eg1: The adjacent or Neighboring Elements of 50 are
 
10 20 30
40 50 60
70 80 90

Here, 50 is surrounded by all other elements.

Eg2: The adjacent or Neighboring Elements of 20 are

 10 20 30
 40 50 60

Eg3: The adjacent or Neighboring Elements of 30 are

 20 30
 50 60

Eg4: The adjacent or Neighboring Elements of 40 are

 10 20
 40 50
 70 80

Based on the element 's position, we consider it as either a starting element (S), a Middle element(M) or an End element (E).

Eg:

10, 70 are starting elements.

20, 40, 50, 60, 80 are Middle elements.

30, 90 are Ending elements.

Following is code for printing adjacent elements of a square matrix. Please execute to understand it.

Need pass two parameters

1st param: Order of the matrix:  eg: input1=3

2nd param: String of Rows, where each element of the array is a row. All elements of a row are delimited by # symbol.

Eg:
     input2=['row1','row2','row3']

row1='10#20#30'  row2='40#50#60' row3='70#80#90'

Download Code: AdjacentElements.java

public class AdjacentElements {
 public static void main(String args[]) {
  int input1=5;
  String[] input2={"12#45#33#27#23", "94#54#23#53#11", "98#59#27#62#12","11#51#63#13#46","17#45#31#78#67"};
  /*
      Few Examples you can try
       String[] input2={"12#45#33#27", "94#54#23#53", "98#59#27#62","11#51#63#13"};
    String[] input2={"12#45#33", "94#54#23", "98#59#27"};
    String[] input2={"12"};
       String[] input2={"12#45", "94#54"};

   * You need pass two parameters 
   * first parameter (input1): Order Of Square Matrix;
   * Second parameter (input2): Arrays of Rows where elements of the each row delimited by a # symbol.
   * Eg: ['row1','row2','row3'...]
   */
  printNeighboringElements(input1, input2);
 }
 public static void printNeighboringElements(int input1, String[] input2){
  if(input1!=1){
   String[] tempRows={};
   for(int i=0;i < input2.length;i++){
    /*
     * Here, It prints adjacent elements of all the elements 
     * of any square matrix of any order.
     * We assume element's position in the matrix as any of these 3 values
     * S or M or E
     * S represents Starting Element
     * M represents Middle Element
     * E represents Ending Element.
     */
    String[] reqRow1Elements=new String[input1];
    String[] reqRow2Elements=new String[input1];
    String[] reqRow3Elements=new String[input1];
    String rowStatus = findRowOrPosStatus(i,input1);
    
    if(rowStatus=="S"){
     tempRows = new String[2];
     tempRows[0]=input2[i];
     tempRows[1]=input2[i+1];
     reqRow1Elements=tempRows[0].split("#");
     reqRow2Elements=tempRows[1].split("#");
    }else if(rowStatus=="M"){
     tempRows = new String[3];
     tempRows[0]=input2[i-1];
     tempRows[1]=input2[i];
     tempRows[2]=input2[i+1];
     reqRow1Elements=tempRows[0].split("#");
     reqRow2Elements=tempRows[1].split("#");
     reqRow3Elements=tempRows[2].split("#");
    }else if(rowStatus=="E"){
     tempRows = new String[2];
     tempRows[0]=input2[i-1];
     tempRows[1]=input2[i];
     reqRow1Elements=tempRows[0].split("#");
     reqRow2Elements=tempRows[1].split("#");
    }
    String[] rowElements = input2[i].split("#");
    for(int e=0;e < rowElements.length;e++){
     System.out.println("Adjacent/Neighboring Elements of "+rowElements[e]);
     System.out.println("***********************************");
    String posStatus=findRowOrPosStatus(e, input1);
     if(posStatus=="S"){
      if(rowStatus=="S" || rowStatus=="E"){
       System.out.println(reqRow1Elements[e]+" "+reqRow1Elements[e+1]);
       System.out.println(reqRow2Elements[e]+" "+reqRow2Elements[e+1]);
      }else if(rowStatus=="M"){
       System.out.println(reqRow1Elements[e]+" "+reqRow1Elements[e+1]);
       System.out.println(reqRow2Elements[e]+" "+reqRow2Elements[e+1]);
       System.out.println(reqRow3Elements[e]+" "+reqRow3Elements[e+1]);
      }
     }else if(posStatus=="M"){
      if(rowStatus=="S" || rowStatus=="E"){
       System.out.println(reqRow1Elements[e-1]+" "+reqRow1Elements[e]+" "+reqRow1Elements[e+1]);
       System.out.println(reqRow2Elements[e-1]+" "+reqRow2Elements[e]+" "+reqRow2Elements[e+1]);
      }else if(rowStatus=="M"){
       System.out.println(reqRow1Elements[e-1]+" "+reqRow1Elements[e]+" "+reqRow1Elements[e+1]);
       System.out.println(reqRow2Elements[e-1]+" "+reqRow2Elements[e]+" "+reqRow2Elements[e+1]);
       System.out.println(reqRow3Elements[e-1]+" "+reqRow3Elements[e]+" "+reqRow3Elements[e+1]);
      }
     }else if(posStatus=="E"){
      if(rowStatus=="S" || rowStatus=="E"){
       System.out.println(reqRow1Elements[e-1]+" "+reqRow1Elements[e]);
       System.out.println(reqRow2Elements[e-1]+" "+reqRow2Elements[e]);
      }else if(rowStatus=="M"){
       System.out.println(reqRow1Elements[e-1]+" "+reqRow1Elements[e]);
       System.out.println(reqRow2Elements[e-1]+" "+reqRow2Elements[e]);
       System.out.println(reqRow3Elements[e-1]+" "+reqRow3Elements[e]);
      }
     }
    }
   }//rows loop
  }else {
   System.out.println("No adjacent elements-Its a 1X1 matrix");
  }//for 1X1 matrix
 }
 private static String findRowOrPosStatus(int rowOrPos,int input1){
  String rowOrPosStatus="";
  if(rowOrPos==0){
   rowOrPosStatus="S";
  }else if(rowOrPos==input1-1){
   rowOrPosStatus="E";
  }else if(rowOrPos < input1-1 && rowOrPos!=0){
   rowOrPosStatus="M";
  }
  return rowOrPosStatus;
 }
} 

The Adjacent Elements of 5x5 matrix are printed as :

String[] input2=
{"12#45#33#27#23",   "94#54#23#53#11",  "98#59#27#62#12",
"11#51#63#13#46",   "17#45#31#78#67"};

Output

Adjacent/Neighboring Elements of 12
***********************************
12 45
94 54
Adjacent/Neighboring Elements of 45
***********************************
12 45 33
94 54 23
Adjacent/Neighboring Elements of 33
***********************************
45 33 27
54 23 53
Adjacent/Neighboring Elements of 27
***********************************
33 27 23
23 53 11
Adjacent/Neighboring Elements of 23
***********************************
27 23
53 11
Adjacent/Neighboring Elements of 94
***********************************
12 45
94 54
98 59
Adjacent/Neighboring Elements of 54
***********************************
12 45 33
94 54 23
98 59 27
Adjacent/Neighboring Elements of 23
***********************************
45 33 27
54 23 53
59 27 62
Adjacent/Neighboring Elements of 53
***********************************
33 27 23
23 53 11
27 62 12
Adjacent/Neighboring Elements of 11
***********************************
27 23
53 11
62 12
Adjacent/Neighboring Elements of 98
***********************************
94 54
98 59
11 51
Adjacent/Neighboring Elements of 59
***********************************
94 54 23
98 59 27
11 51 63
Adjacent/Neighboring Elements of 27
***********************************
54 23 53
59 27 62
51 63 13
Adjacent/Neighboring Elements of 62
***********************************
23 53 11
27 62 12
63 13 46
Adjacent/Neighboring Elements of 12
***********************************
53 11
62 12
13 46
Adjacent/Neighboring Elements of 11
***********************************
98 59
11 51
17 45
Adjacent/Neighboring Elements of 51
***********************************
98 59 27
11 51 63
17 45 31
Adjacent/Neighboring Elements of 63
***********************************
59 27 62
51 63 13
45 31 78
Adjacent/Neighboring Elements of 13
***********************************
27 62 12
63 13 46
31 78 67
Adjacent/Neighboring Elements of 46
***********************************
62 12
13 46
78 67
Adjacent/Neighboring Elements of 17
***********************************
11 51
17 45
Adjacent/Neighboring Elements of 45
***********************************
11 51 63
17 45 31
Adjacent/Neighboring Elements of 31
***********************************
51 63 13
45 31 78
Adjacent/Neighboring Elements of 78
***********************************
63 13 46
31 78 67
Adjacent/Neighboring Elements of 67
***********************************
13 46
78 67