package matrix;

import java.util.LinkedList;
import java.util.List;

public class Main extends Exception {

    public static void main(String[] args) throws MatrixIndexException {Matrix m1 = new Matrix(3, 3);
        Matrix m2 = new Matrix(3, 3);
        
        MatrixUtils.fillByRandom(m1);
        MatrixUtils.fillByRandom(m2);
        
        Matrix m = MatrixUtils.MatrixMultiple(m1, m2);
        
        System.out.println(m.toString());

package matrix;

import java.util.Random;
import java.util.Scanner;
import java.io.InputStreamReader;

public class MatrixUtils {

    public static void fillByRandom(Matrix m) {
        int rowCount = m.getRowCount();
        int colCount = m.getColCount();
        Random random = new Random();

        for (int i = 1; i <= rowCount; i++) {

            for (int j = 1; j <= colCount; j++) {
                try {
                    m.put(i, j, random.nextInt(50));
                } catch (MatrixIndexException e) {
                    System.err.println(e.getMessage());

                }

            }
        }
    }

    public static void fillByNumber(Matrix m, int number) {
        int rowCount = m.getRowCount();
        int colCount = m.getColCount();

        for (int i = 1; i <= colCount; i++) {

            for (int j = 1; j <= rowCount; j++) {
                try {
                    m.put(i, j, number);

                } catch (MatrixIndexException e) {
                    System.err.println(e.getMessage());

                }

            }
        }

    }

    public static Matrix fillByKeyboard() {
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter The Number Of Matrix Rows:");
        int rowCount = scan.nextInt();
        System.out.println("Enter The Number Of Matrix Columns:");
        int colCount = scan.nextInt();
        try {
            Matrix m = new Matrix(rowCount, colCount);
            System.out.println("Enter Matrix Data:");
            for (int i = 1; i <= rowCount; i++) {
                for (int j = 1; j <= colCount; j++) {
                    int value = scan.nextInt();
                     m.put(i, j, value);
                }
            }
            return m;

        } catch (MatrixIndexException ex) {
            System.err.println(ex.getMessage());

        }
        return null;

    }
    
    public static Matrix MatrixMultiple(Matrix a, Matrix b){
       
   


    }
}

package matrix;

public class Matrix {
    
 
    private int rowCount;
    private int colCount;
    private int[][] data;

    

    Matrix(int row, int col) throws MatrixIndexException {
        if (row <= 0 || col <= 0) {
            throw new MatrixIndexException("Недопустимый размер матрицы.");
        }
        this.rowCount = row;
        this.colCount = col;
        data = new int[row][col];
    }

    Matrix(Matrix matrix) {

        this.rowCount = matrix.getRowCount();
        this.colCount = matrix.getColCount();
        data = new int[rowCount][colCount];

        for (int i = 1; i < rowCount; i++) { 
            for (int j = 1; j < colCount; j++) {
                data[i][j] = matrix.data[i][j];
            }
        }
    }

   

    public int get(int i, int j) throws MatrixIndexException {
        if (i < 1 || i > rowCount) {  
            throw new MatrixIndexException("Недопустимое число строк: " + i);
        }
        if (j < 1 || j > colCount) {
            throw new MatrixIndexException("Недопустимое число столбцов: " + j);
        }
        
        return data [i-1][j-1];
    }

    void put(int i, int j, int value) throws MatrixIndexException {
        if (i < 1 || i > rowCount) {
            throw new MatrixIndexException("Недопустимое число строк: " + i);
        }
        if (j < 1 || j > colCount) {
            throw new MatrixIndexException("Недопустимое число столбцов: " + j);
        }
        data[i-1][j-1] = value;


    }

    public int getRowCount() {
        return rowCount;
    }

    public int getColCount() {
        return colCount;
    }

    @Override
    public boolean equals(Object obj) {
        Matrix m = (Matrix) obj;

        if (m.getRowCount() != rowCount || m.getColCount() != colCount) {
            return false;
        }

        for (int i = 0; i < rowCount; i++) {
            for (int j = 0; j < colCount; j++) {
                if (data[i][j] != m.data[i][j]) {
                    return false;
                }
            }
        }

        return true;
    }

    @Override
    public String toString() {
        StringBuilder out = new StringBuilder();
        out.append("Matrix:\n[ ");
        for (int i = 0; i < rowCount; i++) {
            if (i != 0) {
                out.append("\n");
                out.append("  ");
            }
            for (int j = 0; j < colCount; j++) {
                out.append(data[i][j]);
                if (j == colCount - 1) {
                    continue;
                }
                for (int k = 0; k < getMaxLength() - getIntLength(data[i][j]) + 2; k++) {
                    out.append(" ");
                }
            }
        }
        out.append("  ]");
        return out.toString();
    }

    private int getMaxLength() {
        int max = Integer.MIN_VALUE;
        for (int i = 0; i < rowCount; i++) {
            for (int j = 0; j < colCount; j++) {
                int k = data[i][j];
                if (k > max) {
                    max = k;
                }
            }
        }
        return getIntLength(max);
    }

    private int getIntLength(int i) {
        return String.valueOf(i).length();
    }

}