PlusRemover

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Scanner;

public class plusRemove {
    static char[][] duplicateMatrix;
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        ArrayList<String> inputLines = new ArrayList<String>();

        inputLines = FillList(input,inputLines);
        char[][] matrix = new char[inputLines.size()][];
        duplicateMatrix = new char[inputLines.size()][];
        matrix = MatrixFill(matrix,duplicateMatrix,inputLines);

        matrix = RemovePluses(matrix,duplicateMatrix);
        PrintCleanedMatrix(matrix);
    }

    private static void PrintCleanedMatrix(char[][] matrix) {
        for(char[] row : matrix){
            for (char character : row){
                if(character != '†'){
                    System.out.printf("%c",character);
                }
            }
            System.out.println();
        }
    }

    private static char[][] RemovePluses(char[][] matrix, char[][] duplicateMatrix) {
        for (int i = 1; i < duplicateMatrix.length-1; i++) {
            for (int j = 1; j < duplicateMatrix[i].length-1; j++) {
                boolean isPlus = false;
                try{
                    isPlus = duplicateMatrix[i][j] == duplicateMatrix[i][j-1] &&
                            duplicateMatrix[i][j+1] == duplicateMatrix[i][j-1]
                            && duplicateMatrix[i][j+1] == duplicateMatrix[i-1][j]
                            && duplicateMatrix[i-1][j] == duplicateMatrix[i-1][j];
                }  catch (IndexOutOfBoundsException ex){
                    continue;
                }
                if(isPlus){
                    matrix[i][j-1] = '†';
                    matrix[i][j] = '†';
                    matrix[i][j+1] = '†';
                    matrix[i-1][j] = '†';
                    matrix[i+1][j] = '†';
                }
            }
        }
        return matrix;
    }

    private static char[][] MatrixFill(char[][] matrix,char[][] duplicateMatrix ,ArrayList<String> inputLines) {
        for (int i = 0; i < inputLines.size() ; i++) {
            matrix[i] = inputLines.get(i).toCharArray();
            duplicateMatrix[i] = inputLines.get(i).toUpperCase().toCharArray();
        }
        return matrix;
    }

    private static ArrayList<String> FillList(Scanner input, ArrayList<String> inputLines) {

        String line = "";

        while(!(line = input.nextLine()).equals("END")){
            inputLines.add(line);
        }
        return inputLines;
    }
}