update,

_resources/it114105/itp4510/Lab02/Lab2.1/q5/a/InputParsing.java

@@ -0,0 +1,50 @@
+import javax.swing.JOptionPane;
+
+public class InputParsing {
+    public static void main(String[] args) {
+        String input;
+        int num = 0;
+        int total = 0;
+        int average = 0;
+        int[] a = { 80, 60, 72, 85, 90 };
+        String output;
+        output = "The 5 marks are:";
+        for (int i = 0; i < 5; i++)
+            output += " " + a[i];
+        output += "\nAverage of how many numbers?";
+        input = JOptionPane.showInputDialog(output);
+        try {
+            System.out.println("Input length = " + input.length());
+            num = Integer.parseInt(input);
+            if (num == 0)
+                throw new ArithmeticException();
+            if (num == -1)
+                throw new NegativeNumberException();
+            total = 0;
+            for (int i = 0; i < num; i++)
+                total += a[i];
+            average = total / num;
+        } catch (ArrayIndexOutOfBoundsException e) {
+            System.out.println("No more than 5 please!");
+        } catch (NumberFormatException e) {
+            System.out.println("Integer please!");
+        } catch (NullPointerException e) {
+            System.out.println("Input length = 0; cancelled");
+        } catch (NegativeNumberException e) {
+            System.out.println(e.getMessage());
+        } catch (ArithmeticException e) {
+            System.out.println("Don't input zero!");
+        } catch (RuntimeException e) {
+            System.out.println("Run time error!");
+            e.printStackTrace();
+            return;
+        } catch (Exception e) {
+            System.out.println("Something wrong!");
+            e.printStackTrace();
+        } finally {
+            System.out.println("Number = " + num);
+        }
+        System.out.println("Average over first " + num + " numbers = " + average);
+
+    }
+}