java传递String参数

java传递String参数不会改变原String参数，此处传递的是copy

package numCombine;

public class NumComberAll {

	public static void main(String[] args) {
		// TODO Auto-generated method stub		
		String s = "lll";
		fun(s);
		System.out.println(s);
	}	
	public static void fun(String s){
		s = "ttt";
	}
}

lll