Java十分钟精通异常处理机制

try{
    //可能会出错的代码块
}catch(){
    //出现异常后，执行的语句
}finally{
    //通常用来释放资源
}

public void fun1() throws ParseException {
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    Date date = format.parse("2020-10-12");
}

public void fun2() {
     throw new NullPointerException("空指针异常");  
     System.out.println("hello world");//会报红，提示unreachable statement,该语句不可能被执行
}

@Test
public void fun2()  {
    try {
        throw new Exception("非运行时异常，哈哈哈");
    } catch (Exception e) {
        e.printStackTrace();
        try {
            throw new ParseException("解析异常，哈哈哈",0);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }finally {
        try {
            throw new TimeoutException("超时异常，哈哈哈");
        } catch (TimeoutException e) {
            e.printStackTrace();
            try {
                throw new SQLException("SQL异常");
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
        }
    }
}

public int  funR1(){
        try {
            return 1;
        }catch (Exception e){
           throw new RuntimeException();
        }
    }
public int  funR2(){
    if(true) {
        return 1;
    }else{
        throw new RuntimeException();
    }
}

public class HeroNotExistException extends RuntimeException {
    private String m;

    public String getM() {
        return m;
    }

    public void setM(String m) {
        this.m = m;
    }
//两个参数的有参构造，一个传递给父类Throwable,一个自己用
    public HeroNotExistException(String message, String m){
       super(message);
       this.m=m;
    }

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入您最欣赏的历史人物：");
        String name = sc.next();
        if(name.equals("孙悟空")){
            try{
                throw new HeroNotExistException("英雄人物不存在","哈哈");
            }catch (HeroNotExistException e){
                e.printStackTrace();
                System.out.println(e.getM());
            }
        }
    }
    
}