80 lines
3.3 KiB
Java
80 lines
3.3 KiB
Java
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package ru.gb.jcore;
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import java.util.Arrays;
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public class Exceptional {
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private static final class ColumnMismatchException extends RuntimeException {
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ColumnMismatchException(String message) {
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super("Columns exception: " + message);
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}
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}
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private static final class NumberIsNotNumberException extends RuntimeException {
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NumberIsNotNumberException(String message) {
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super("Not a number found: " + message);
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}
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}
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private static final class RowMismatchException extends RuntimeException {
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RowMismatchException(int expected, int current, String value) {
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super(String.format("Rows exception: expected %d rows. Received %d rows in '%s' string",
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expected, current, value));
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}
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}
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private static final String CORRECT_STRING= "1 3 1 2\n2 3 2 2\n5 6 7 1\n3 3 1 0";
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private static final String EXTRA_ROW_STRING= "1 3 1 2\n2 3 2 2\n5 6 7 1\n3 3 1 0\n1 2 3 4";
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private static final String EXTRA_COL_STRING= "1 3 1 2 1\n2 3 2 2 1\n5 6 7 1 1\n3 3 1 0 1";
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private static final String NO_ROW_STRING= "1 3 1 2\n2 3 2 2\n5 6 7 1";
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private static final String NO_COL_STRING= "1 3 1 2\n2 3 2 2\n5 6 7 1\n3 3 1";
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private static final String HAS_CHAR_STRING= "1 3 1 2\n2 3 2 2\n5 6 7 1\n3 3 1 A";
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private static final int MATRIX_ROWS= 4;
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private static final int MATRIX_COLS= 4;
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private static String[][] stringToMatrix(String value) {
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String[] rows = value.split("\n");
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if (rows.length !=MATRIX_ROWS)
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throw new RowMismatchException(MATRIX_ROWS, rows.length, value);
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String[][] result = new String[MATRIX_ROWS][];
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for (int i = 0; i < result.length; i++) {
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result[i] = rows[i].split(" ");
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if (result[i].length !=MATRIX_COLS)
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throw new ColumnMismatchException(result[i].length + ":\n" + value);
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}
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return result;
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}
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private static float calcMatrix(String[][] matrix) {
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float result = 0;
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int len = 0;
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for (int i = 0; i < matrix.length; i++) {
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for (int j = 0; j < matrix[i].length; j++) {
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try {
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result += Integer.parseInt(matrix[i][j]);
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++len;
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} catch (NumberFormatException e) {
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throw new NumberIsNotNumberException(matrix[i][j]);
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}
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}
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}
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return result / len;
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}
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public static void main(String[] args) {
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try {
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// final String[][] matrix = stringToMatrix(CORRECT_STRING);
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// final String[][] matrix = stringToMatrix(NO_ROW_STRING);
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// final String[][] matrix = stringToMatrix(NO_COL_STRING);
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final String[][] matrix =stringToMatrix(HAS_CHAR_STRING);
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System.out.println(Arrays.deepToString(matrix));
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System.out.println("Half sum = " +calcMatrix(matrix));
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} catch (NumberIsNotNumberException exceptionObjectName) {
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System.out.println("A NumberFormatException is thrown: " + exceptionObjectName.getMessage());
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} catch (RowMismatchException | ColumnMismatchException superExceptionName) {
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System.out.println("A RuntimeException successor is thrown: " + superExceptionName.getMessage());
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}
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}
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}
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