URL: http://127.0.0.1:9200/likecs_art_db/_search
REQUEST:
Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => Java函数的传参机制
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 0
)
RESPONSE:
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URL: http://127.0.0.1:9200/likecs_art_db/_search
REQUEST:
Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => Java函数的传参机制
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 8
)
RESPONSE:
string(7555) "{"took":27,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":31.794783,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"732672","_score":21.967262,"_source":{"id":"732672","text":"\u65b9\u6cd5\u7684\u53c2\u6570\u4f20\u9012\u673a\u5236","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        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Java函数的传参机制 - 爱码网

Java函数的传参机制

ydymz

一

最近的一个项目，里面各种返回void，参数用引用类型，那叫一个熟和多，但是也把我绕糊涂了。

我就打算好好理一理java的传参机制，整理一番

 

二

很多人一听Java的传参，那一定会脱口而出，java都是值传递的。恭喜各位，答对了。

那么，传的是什么值？

如果参数类型是原始类型，那么传过来的就是这个参数的一个副本，也就是这个原始参数的值，这个跟之前所谈的传值是一样的。如果在函数中改变了副本的值不会改变原始的值.

如果参数类型是引用类型，那么传过来的就是这个引用参数的副本，这个副本存放的是参数的地址。如果在函数中没有改变这个副本的地址，而是改变了地址中的 值，那么在函数内的改变会影响到传入的参数。如果在函数中改变了副本的地址，如new一个，那么副本就指向了一个新的地址，此时传入的参数还是指向原来的 地址，所以不会改变参数的值。
 
 

三

这里我给个代码就很好理解了
 1 public class ParamterTest {
 2     public static void main(String[] args) {
 3         List<Integer> list1 = new ArrayList<>();
 4         List<Integer> list2 = new ArrayList<>();
 5         list1.add(0);
 6         list2.add(0);                          //(1)
 7         f(list1, list2);
 8         System.out.println("list1 2");
 9         p(list1);
10         System.out.println("list2 2");
11         p(list2);                              //(4)
12     }
13 
14     public static void f(List<Integer> list1, List<Integer> list2) {
15         list1.add(1);
16         list2.add(1);
17         list2 = new ArrayList<>();             //(2)
18         list1.add(2);
19         list2.add(2);
20         System.out.println("list1 1");
21         p(list1);
22         System.out.println("list2 1");
23         p(list2);                             //(3)
24     }
25 
26     public static void p(List<Integer> list) {
27         for (Integer i : list) {
28             System.out.println(i);
29         }
30     }
31 }

输出结果

list1 1
0
1
2
list2 1
2
list1 2
0
1
2
list2 2
0
1

 

四

要具体解释，就是涉及到堆，栈和方法区了。

(1)list1，list2刚刚成立，都放进了 0，因为是对象的实例所以保存在堆里面。

(2)list1，list2将自己堆的地址传到了方法里，因为是引用所以保存在栈里面，并通过地址往堆里面的实例，放进了 1。但是，此时new了一个实例，list2在栈里面不再指向堆的实例，而是一个新的地址。

(3)list1，list2放进了2，但此处list1依然指向堆的实例，故放进了 2，而list2则是新的地址，堆的list2并没有放进 2。

(4)方法结束，返回的结果使堆的list1，放进了 1 ， 2 。list2 因为在方法内中途有新的实例， 只放进了 1 ，而没有 2。

 

五

其实一直迷惑我们，是我们判断出错的是String ，明明是一个引用类型，却是基本类型的特性，因为String 实际上是[]char，具体不细说，我就丢个代码，让大家跑跑吧。

public class ParamterStringTest {
    public static void main(String[] args) {
        String s1 = "a";
        String s2 = "a";
        f(s1, s2);
        System.out.println("s1 2");
        p(s1);
        System.out.println("s2 2");
        p(s2);
    }

    public static void f(String s1, String s2) {
        s1 = "b";
        s2 = "b";
        System.out.println("s1 1");
        p(s1);
        System.out.println("s2 1");
        p(s2);
    }

    public static void p(String s) {
        System.out.println(s);
    }

}

同理，相应的Interge等包装类。

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