异常的应用

public class Test {
    public static void main(String[] args){   
       System.out.println(new Test().test());
    }
    public int test(){
        int a=0;
        try{
            a=1;
            execute();
            System.out.println(1);
            return a;
        }catch(RuntimeException e){
            a=2;
            System.out.println(2);
            return a;
        }catch(Exception e){
            a=3;
            System.out.println(3);
            return a;
        }finally{
            a=4;
            System.out.println(4);
        }
    }
    public void execute() throws ArrayIndexOutOfBoundsException{
        throw new ArrayIndexOutOfBoundsException();
    }
}

结果为：2 4 2