java常踩的坑

list删除元素

```java for(int i = list.size(); i >= 0; i--){ list.remove(i); i--; } ```

销毁字符串

    /**
     * 销毁字符串
     * @param destroyString
     */
    public static void destroyString(String destroyString) {
        try {
            System.out.println("销毁前destroyString："+destroyString);
            // 声明字段
            Field field =String.class.getDeclaredField("value");
            // set可访问
            field.setAccessible(true);
            // convert to char[]
            char[] chars = (char[]) field.get(destroyString);
            // 替换为(char) 0x00
            Arrays.fill(chars,(char) 0x00);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } finally {
            System.out.println("销毁后destroyString："+destroyString);
        }
    }

    public static void main(String[] args) {
        /**
         * 销毁字符串
         */
        destroyString("abc");
    }