package matrix; /** * * @author Den */ public class Main { public static void main(String[] args) { Matrix m1 = new Matrix(3, 3); try { m1.put(0, 0, 100); m1.put(0, 1, -5); m1.put(0, 2, 0); m1.put(1, 0, 100005); m1.put(1, 1, -20); m1.put(1, 2, 64); m1.put(2, 0, 199910); m1.put(2, 1, -35); m1.put(100, 1000, 128); } catch (MatrixIndex) { } System.out.println(m1.toString()); Matrix m2 = new Matrix(m1); System.out.println(m2.toString()); System.out.println(m1.equals(m2)); Matrix m3 = new Matrix(2, 2); m3.put(0, 0, 10); m3.put(0, 1, 53); m3.put(1, 0, 20); m3.put(1, 1, 106); System.out.println(m3.toString()); System.out.println(m1.equals(m3)); } } }

second code file if you want to understand:

 package matrix; /** * * @author Den */ public class Matrix { private int row; private int col; private int[][] data; Matrix(int row, int col) { this.row = row; this.col = col; data = new int[row][col]; } Matrix(Matrix matrix) { this.row = matrix.getRow(); this.col = matrix.getCol(); data = new int[row][col]; for (int i = 0; i < row; i++) { for (int j = 0; j < col; j++) { data[i][j] = matrix.data[i][j]; } } } public int get(int row, int col) { return data[row][col]; } void put(int row, int col, int value) { data[row][col] = value; } private int getRow() { return row; } private int getCol() { return col; } @Override public boolean equals(Object obj) { Matrix m = (Matrix) obj; if (m.getRow() != row || m.getCol() != col) { return false; } for (int i = 0; i < row; i++) { for (int j = 0; j < col; 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 < row; i++) { if (i != 0) { out.append("\n"); out.append(" "); } for (int j = 0; j < col; j++) { out.append(data[i][j]); if (j == col - 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 < row; i++) { for (int j = 0; j < col; j++) { int k = data[i][j]; if (k > max) { max = k; } } } return getIntLength(max); } private int getIntLength(int i) { return String.valueOf(i).length(); }
  • one
    And what do you want to achieve through try catch? - Roman Danilov
  • so as not to go beyond the bounds of the index, to display only a 3x3 matrix. Suppose if you enter (23,23) should display an error as it does not fit on 3x3 - Bruce banner
  • one
    Try to write more detailed questions. To get an answer, explain what exactly you see the problem, how to reproduce it, what you want to get as a result, etc. Give an example in the question that clearly demonstrates the problem. - Kromster
  • one
    Why do you need to process something with try catch if there is no exception. You can get by just checking (validation) and if the number does not fit, then assign the default and all - Andrii Torzhkov
  • wrote in the assignment) - Bruce banner

1 answer 1

You need to catch java.lang.ArrayIndexOutOfBoundsException:

 try { ... } catch (ArrayIndexOutOfBoundsException e) ... }