new一个LinkedHashMap对象

你可以使用以下代码来创建一个LinkedHashMap对象：

import java.util.LinkedHashMap;

// 创建一个LinkedHashMap对象
LinkedHashMap<String, Integer> linkedHashMap = new LinkedHashMap<>();

这将创建一个空的LinkedHashMap对象，其中键和值的类型分别为String和Integer。你可以根据需要修改键和值的类型。

相关问题

linkedhashmap转对象

要将一个LinkedHashMap转换为Java对象，您需要遵循以下步骤：

1. 创建一个与对象属性对应的Java类。

例如，如果您有一个LinkedHashMap，它包含 "name" 和 "age" 属性，则可以创建一个如下的Java类：

public class Person {
    private String name;
    private int age;
 
    // getters and setters
}

2. 使用对象映射库，如Jackson或Gson，将LinkedHashMap转换为Java对象。

下面是使用Jackson将LinkedHashMap转换为Person对象的示例代码：

ObjectMapper objectMapper = new ObjectMapper();
Person person = objectMapper.convertValue(linkedHashMap, Person.class);

其中，linkedHashMap是要转换的LinkedHashMap对象，Person.class是目标Java类。

使用Gson的示例代码如下：

Gson gson = new Gson();
Person person = gson.fromJson(gson.toJson(linkedHashMap), Person.class);

其中，toJson()方法将LinkedHashMap对象转换为JSON字符串，fromJson()方法将JSON字符串转换为Java对象。

LinkedHashMap转对象

LinkedHashMap is a data structure used to store key-value pairs in the order they were inserted. To convert a LinkedHashMap to an object, you can do the following:

1. Create a class that matches the structure of the LinkedHashMap. This class should have fields that correspond to the keys in the LinkedHashMap.

2. Loop through the LinkedHashMap and set the values of the fields in the object using the values in the LinkedHashMap.

Here's an example:

import java.util.LinkedHashMap;

public class Person {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public static void main(String[] args) {
        LinkedHashMap<String, Object> map = new LinkedHashMap<>();
        map.put("name", "John");
        map.put("age", 30);

        Person person = new Person((String) map.get("name"), (int) map.get("age"));
        System.out.println(person.getName() + " " + person.getAge());
    }
}

In this example, we have a Person class with name and age fields. We create a LinkedHashMap with keys "name" and "age" and values "John" and 30, respectively. We then create a Person object and set its name and age fields using the values in the LinkedHashMap. Finally, we print out the name and age of the Person object.