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Accepted
Александр
Asked:2020-12-22 05:30:29 +0800 CST2020-12-22 05:30:29 +0800 CST

更改地图副本

  • 772

告诉：

HashMap<String,String>data=new HashMap<>();
data.put("Имя","Вася");
data.put("Фамилия","Иванов");
HashMap<String,String>data11=data;
data.put("Имя","Петя");
System.out.println(data11.get("Имя"));

我怎样才能让第二次Map保存价值？

java

1 个回答

  1. Best Answer

    1. 对同一对象的新引用（问题中的那个）：

      HashMap<String, String> data11 = data;


      var data = {};
data["Имя"] = "Вася";
data["Фамилия"] = "Иванов";
var data11 = data;
data["Имя"] = "Петя";
console.log(data11["Имя"]);

    具有相同数据的新对象（您想要的）：

    HashMap<String, String> data11 = new HashMap<String, String>(data);


    var data = {};
data["Имя"] = "Вася";
data["Фамилия"] = "Иванов";
var data11 = Object.assign({}, data);
data["Имя"] = "Петя";
console.log(data11["Имя"]);

    • 2

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