Exception和Error 有什么区别

NoClassDefFoundError ,VirtualMachineError, OutOfMemoryError,StackOverflowError

NullPointException ，ClassCastException ,ClassNotFoundException

IOException 、SQLException

import java.util.ArrayList;
import java.util.List;

public class TestError {

    public static void main(String args[]){

        List<User> users = new ArrayList<User>(2); // 为啥两次就是为了打出NoClassDefFoundError

        for(int i=0; i<2; i++){
            try{
                users.add(new User(String.valueOf(0))); //will throw NoClassDefFoundError
            }catch(Error e){
                System.out.println("Catch Error "+e);
            }catch(Exception t){
                System.out.println("Catch Exception");
                t.printStackTrace();
            }
        }

        try{
            divsion(1,0);
        }catch(Error e){
            System.out.println("Catch Error "+e);
        }catch(Exception t){
            System.out.println("Catch Exception"+t);
//            t.printStackTrace();
        }
    }

    public static int divsion(int i, int j) throws Exception {
        int k = i / j;
        return k;
    }
}

class User{
    private static String USER_ID =  getUserId();

    public User(String id){
        this.USER_ID = id;
    }
    private static String getUserId() {
        throw new RuntimeException("UserId Not found"); //实例化异常
    }
}