Question

我是java编程的初学者。

如何通过填充for循环中每个索引的值来创建和初始化包含Arraylist或数组中的单维和二维数组的数组。任何帮助将不胜感激

{
"john":  
      {  
         "age":"20",
         "eye color":"blue",
         "location":"somewhere in the world",
         "education-level":"degree",
       }

"ben" : 
      {  
         "age":"16",
         "eye color":"green",
         "location":"somewhere in the world",
         "education-level":"secondary school",
       }

}

我们的想法是创建一个存储人们信息的数组，如上所示

Answer 1

您可以使用Java为您的数据创建和初始化2D数组。

String[][] array = new String[][]{
        {"john","20","blue","somewhere in the world","degree"},
        {"ben","16", "green", "somewhere in the world", "secondary school"}         
    };

但对于您的数据，最好有一些数据结构，如下所示。

<强> Person.java

public class Person{
    private String name;
    private PersonDetails details;
//getters and setters
}

<强> PersonDetails.java

public class PersonDetails{
    private int age;
    private String eyeColor;
    private String location;
    private String educationLevel;
//getters and setters
}

主要功能

List<Person> personsList = new ArrayList<>();
// loop starts
PersonDetails pd = new PersonDetails();
//set values
Person p = new Person();
//set values
personsList.add(p);
//loop ends

Answer 2

你可以参考这个链接：

How to create a Multidimensional ArrayList in Java?

创建一个多维数组列表，然后用T更改字符串，这样它就可以获取对象

Answer 3

您的JSON语法错误，正确的方法是获取像这样的json

{
"people" : 
[
    {  "name":"john",
        "age":"20",
        "eye color":"blue",
        "location":"somewhere in the world",
        "education-level":"degree"
    },
    {  
        "name":"ben",
        "age":"16",
        "eye color":"green",
        "location":"somewhere in the world",
        "education-level":"secondary school"
    }
]
}

[和]定义了一个元素数组，{和}代表了数据类型的对象;在这种情况下，人们。

然后你可以获得一系列'people'对象，其中包含必要的信息。我有this将java对象序列化和反序列化为json和visceversa，试试这个。希望能帮到你。

JAVA如何创建单维和多维数组

3 个答案: