java异常结构

结构如下：       

               Throwable

Error                           Exception

                RuntimeException          非RuntimeException(编译时检查)

几个关键字：try catch finally throws throw

异常的继承：

public class MyException extends Exception { private int id; //每个异常有一个id号 public MyException(String message, int id){ super(message); this.id = id; } public int getId() { return id; } public void setId(int id) { this.id = id; } } public class City { public static void main(String[] args) { int i = 0; if(i==0){ try { throw new MyException("haha", 0); } catch (MyException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } test4.MyException: haha at test4.City.main(City.java:11)