2dArrays

package pkg2darrays;

/**
 *
 * @author alizeidillazyuksel
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
       
        //printMatrix(generateMatrix(2,3));
        int [][] myMatrix = generateMatrix(4,5);
        printMatrix(myMatrix);
        largestRowFirst(myMatrix);
        System.out.println("");
        
    }
    
    public static void printMatrix(int[][] matrix){
        for(int i = 0; i < matrix.length; i++){
            for(int y = 0; y < matrix[i].length; y++){
                System.out.print(matrix[i][y] + " ");
        }
            System.out.println();
        }
    }
    
    public static int[][] generateMatrix(int row, int column){
        int[][] matrix = new int [row][column];
        for(int i = 0; i < row; i++){
            for(int y = 0; y <column; y++){
                matrix[i][y] = (int)(Math.random()*10);
        }
            
        }
        
        return matrix;    
    
    }
    public static int[][] largestRowFirst(int[][] matrix){
        int largestRowIndex = -1;   
        int max_sum = Integer.MIN_VALUE;    
        for(int i=0; i<matrix.length; i++){
            int sum = 0;
            for(int j=0; j<matrix[i].length; j++){
                sum += matrix[i][j];
            }
            if(sum > max_sum){
                max_sum = sum;
                largestRowIndex = i;
            } 
        }
        //swapping largest and first row
        int[] temp = matrix[0];
        matrix[0] = matrix[largestRowIndex];
        matrix[largestRowIndex] = temp;
        return matrix;      
    }
    
        public static int[][] largestColFirst(int[][] matrix){
        int[] largestCol = new int[matrix.length];
        int largestColIndex = -1;
        int max_sum = Integer.MIN_VALUE;
        for(int i=0; i<matrix[0].length; i++){
            int sum = 0;
            int[] tempCol = new int[matrix.length];
            for(int j=0; j<matrix.length; j++){
                tempCol[j] = matrix[j][i];
                sum += matrix[j][i];
            }
            if(sum > max_sum){
                max_sum = sum;
                largestColIndex = i;
                largestCol = tempCol;
            } 
        }
        //swapping largest and first column 
        for(int i=0; i<matrix[0].length; i++){
            matrix[i][largestColIndex] = matrix[i][0];
            matrix[i][0] = largestCol[i];
        }
        
        return matrix;     
}