String类型传递是值传递,char[]类型传递是引用传递的实现

package com.lstc.test;

public class TestDemo3 {
	String str = new String("hello");
	char[] ch = { 'a', 'b' };

	public static void main(String[] args) {
		TestDemo3 t = new TestDemo3();
		t.change(t.str, t.ch);//String是封装类，是值传递，char数组是引用传递
		System.out.println(t.str + " and " + t.ch[0] + t.ch[1]);
	}

	public void change(String str, char[] ch) {
		str = "test ok";
		ch[0] = 'c';
	}
}