package com.hspedu.exception_;

public class Course446 {
    public static void main(String[] args) {
        // 常見的執行異常5種

        // 空指標異常
        try {
//            String name = "韓順平教育";
            String name = null;
            System.out.println("name.length: " + name.length());
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }

        System.out.println(
 
"=========================================");
        // 陣列越界異常
        int[] arr = {1, 2, 4};
        try {
            for (int i = 0; i <= arr.length; i++) {
                System.out.println(arr[i]);
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(
 
"錯誤資訊：" + e.getMessage());
        }

        System.out.println("=========================================");
        // 型別轉換異常
        A b = new B();
        B b2 = (B) b;   // 正確
        try {
            C c2 = (C) b;   // 錯誤
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }

        System.out.println(
 
"=========================================");
        // 數字格式不正確異常
        try {
            String name = "韓順平教育";
            int num = Integer.parseInt(name);
            System.out.println("num: " + num);
        } catch (NumberFormatException e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
    }
}

class A {
}

class B extends A {
}

class C extends A {
}