package matrix;


public abstract class Matrix extends Exception  {
    
    public abstract int get(int i, int j) throws MatrixIndexException;
    
    public abstract void put(int i, int j, int value) throws MatrixIndexException; 
        
    public abstract int getRowCount();

    public abstract int getColCount();
    
    @Override
    public String toString() {    
        return "";
    }
    

 @Override
    public String toString() {
        StringBuilder out = new StringBuilder();
        out.append("Matrix:\n[ ");

        for (int i = 0; i < getRowCount(); i++) {
            if (i != 0) {
                out.append("\n");
                out.append("  ");
            }
            for (int j = 0; j < getColCount(); j++) {
                try {
                    out.append(get(i, j));
                } catch (MatrixIndexException e) {

                }
                if (j == getColCount() - 1) {

                    out.append(" ]");
                }

            }
        }
        
        return out.toString();

run:
Matrix:
[  ]
  12 ]
  45 ]
Matrix:
[  ]
  12 ]
  45 ]
trueСБОРКА УСПЕШНО ЗАВЕРШЕНА (общее время: 0 секунд)

Matrix:
[ 123 ]
  456 ]
  789 ]
Matrix:
[ 123 ]
  456 ]
  789 ]
true

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

 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 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 (this.get(i + 1, j + 1)) {
                    return false;
                }
            }
        }

        return true;
    }
        
    }
}

  @Override
    public boolean equals(Object obj) {
        Matrix m = (Matrix) obj;
        if (m.getRowCount() != getRowCount() || m.getColCount() != getColCount()) {
            return false;
        }

        for (int i = 0; i < getRowCount(); i++) {
            for (int j = 0; j < getColCount(); j++) {
                if (this.get(i + 1, j + 1)) {
                    return false;
                }
            }
        }

        return true;
    }
        
    }
}