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how to put the last value of a matrix as first value and vice versa


This example can be helpful for you

I commented the code so it will be quite easy to understand

public class MatrixExample {

    private static int[][] reverse(int[][]
matrix){
        int row=matrix.length;
        int column=matrix[0].length; //we have for
shure this element, his length is the number of
colmn
        int to_return[][] = new int[row][column];
//this is a matrix of the same dimention of the
original
        //the indexes that will cicle the row and
the column of the new matrix
        int new_row=0; 
        int new_column=0;
        for(int i=row-1;i>-1;i--){ //this will
cile the rows from the last to thee first
            for(int j=column-1;j>-1;j--){ 
//this will cicle the colums from the last to the
first
               
to_return[new_row][new_column]=matrix[i][j];
                new_column++;
            }
            new_column=0;
            new_row++;
        }
        return to_return;
    }
    public static void main(String[] args) {
        int matrix[][] = {{ 1, 2, 3},
                        {4, 5, 6},
                        {7, 8, 9},
                        {10,11,12}};

        int[][] new_matrix = reverse(matrix);

        for(int i=0;i<new_matrix.length;i++){
            for(int
j=0;j<new_matrix[0].length;j++){
               
System.out.print(new_matrix[i][j]+" ");
            }
            System.out.println();
        }
    }

}

Categories : Java

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