Java参数传递如何实现长尾词效果，有哪些疑问点？

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javaimport java.util.Arrays;

public class Demo { private String str=1234; private char[] chars={'a', 'b', 'c'};

public static void main(String[] args) { Demo demo=new Demo(); System.out.println(demo.str + + + Arrays.toString(demo.chars)); }}

gistfile1.txt

import java.util.Arrays; public class Demmo{ private String str="1234"; private char[] chars={'a','b','c'}; public static void main(String[] args){ Demmo demmo=new Demmo(); System.out.println(demmo.str+" "+ Arrays.toString(demmo.chars)); exchange(demmo.str,demmo.chars); System.out.println(demmo.str+" "+ Arrays.toString(demmo.chars)); } public static void exchange(String str,char[] chars){ str="5678"; chars[2]='b'; } } 捕获1.PNG