package test;

public class ChangeValue {
    String str = new String("Hello");
    char[] cb = {'a', 'b', 'c'};

    public void chnage(String str, char ch[]) {
        str = "HelloWorld";
        ch[0] = 'b';
        ch[1] = 'b';
    }
    public static void main(String[] args) {
        ChangeValue ex = new ChangeValue();
        ex.chnage(ex.str,ex.cb);
        System.out.println(ex.str);
        System.out.println(ex.cb);
    }
}

我觉得结果是 HelloWorld a,b,c

实际上是。。Hello b,b,c

 java基础有点废物啊。。得努力努力了