Map put

map

代码：

public class test {    static Map<String, Map<String, Integer>> mapB = new HashMap<String, Map<String, Integer>>();    static Map<String, Integer> mapA = new HashMap<String, Integer>();    public test() {        mapA.put("a", 66);    }    public static void main(String[] args) {        test t = new test();        System.out.println(mapA.get("a"));        t.tempA(mapA);        mapB.put("m", mapA);        mapA.put("a", 2);        mapA.put("b", 3);        System.out.println(mapA.get("a") + " --- " + mapA.get("b"));        System.out.println(mapB.get("m").keySet() + " ------ " + mapB.get("m"));        System.out.println(mapA.get("a") + " --- " + mapA.get("b"));    }    public void tempA(Map<String, Integer> mapC) {        mapC.put("a", 6);    }}

运行结果

66
2 — 3
[a, b] —— {a=2, b=3}
2 — 3

目录

用 [TOC]来生成目录：

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