Lesson 3 homework solution

src/main/java/com/algos/vtb/exceptions/Main.java

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+package com.algos.vtb.exceptions;
+
+import java.util.stream.IntStream;
+
+public class Main {
+    public static void main(String[] args) {
+
+        String[][] myArray = new String[][]{
+                {"1", "2", "3", "4"},
+                {"5", "6", "7b", "8"},
+                {"9", "10", "5", "12"},
+                {"13", "14", "15", "16"}
+        };
+        try {
+            System.out.printf("Cумма = %d%n", getSum(myArray));
+        } catch (MyArrayException e) {
+            System.out.println("Exception processed");
+        }
+    }
+
+    private static int getSum(String[][] myArray) throws MyArraySizeException, MyArrayDataException {
+
+        if (myArray.length != 4) {
+            throw new MyArraySizeException("Размер массива должен быть 4x4!");
+        }
+
+//        for (int i = 0; i < myArray.length; i++) {
+//            if (myArray[i].length != 4) {
+//                throw new MyArraySizeException(i);
+//            }
+//        }
+
+//        IntStream.range(0, myArray.length)
+//                .forEach(i -> {
+//                    if (myArray[i].length != 4) {
+//                        throw new MyArraySizeException(i);
+//                    }
+//                });
+
+
+        IntStream.range(0, myArray.length)
+                .filter(i -> myArray[i].length != 4)
+                .findFirst()
+                .ifPresent(i -> {
+                    throw new MyArraySizeException(i);
+                });
+
+        int sum = 0;
+        for (int i = 0; i < myArray.length; i++) {
+            for (int j = 0; j < myArray[i].length; j++) {
+                try {
+                    sum += Integer.parseInt(myArray[i][j]);
+                } catch (NumberFormatException e) {
+                    throw new MyArrayDataException(i, j, myArray);
+                }
+            }
+        }
+        return sum;
+    }
+}

src/main/java/com/algos/vtb/exceptions/MyArrayDataException.java

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+package com.algos.vtb.exceptions;
+
+public class MyArrayDataException extends MyArrayException {
+
+    private int row;
+
+    private int col;
+
+    private Object value;
+
+    public MyArrayDataException() {
+        super();
+    }
+
+    public MyArrayDataException(String message) {
+        super(message);
+    }
+
+    public MyArrayDataException(int row, int col, Object[][] array) {
+        super("Неверные данные в массиве [" + row + "][" + col + "]: " + array[row][col]);
+        this.row = row;
+        this.col = col;
+        this.value = array[row][col];
+    }
+}

src/main/java/com/algos/vtb/exceptions/MyArrayException.java

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+package com.algos.vtb.exceptions;
+
+public class MyArrayException extends RuntimeException{
+    public MyArrayException() {
+    }
+
+    public MyArrayException(String message) {
+        super(message);
+    }
+}

src/main/java/com/algos/vtb/exceptions/MyArraySizeException.java

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+package com.algos.vtb.exceptions;
+
+public class MyArraySizeException extends MyArrayException {
+
+    int row;
+
+    public MyArraySizeException() {
+        super();
+    }
+
+    public MyArraySizeException(String message) {
+        super(message);
+    }
+
+    public MyArraySizeException(int row) {
+        super(String.format("Размер массива в строке %d не равен 4", row));
+        this.row = row;
+    }
+}