java异常处理try..catch..finally

package com.javabase.sss;

public class Dexp {

	public static void main(String[] args) {
		String s = null;
		try {
			System.out.println(s.toString());
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}finally {
			s = "空空道人";
		}
		
		System.out.println(s);
		

	}

}