java面试基础--第二坑

一

package com;

public class NUmberTest {

	public static void main(String[] arg) {
		String str=new String("beijing");
		char[] a= {'a','b','c'};
		NUmberTest test=new NUmberTest();
		test.chang(str, a);
		System.out.println(str+":and:"+a[0]);
	}
	public void chang(String str,char ch[]) {
		str="chengdu";
		ch[0]='z';
	}
}

结果