[英]JAVA How to create single and multi dimensional array
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一个数组,该数组包含一个或二维数组,如下所示在Arraylist或数组中。 任何帮助都感激不尽
{
"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",
}
}
想法是创建一个存储人员信息的数组,如上所述
您可以像这样用Java创建和初始化2D数组作为数据。
String[][] array = new String[][]{
{"john","20","blue","somewhere in the world","degree"},
{"ben","16", "green", "somewhere in the world", "secondary school"}
};
但是对于您的数据,最好具有如下所示的一些数据结构。
人.java
public class Person{
private String name;
private PersonDetails details;
//getters and setters
}
PersonDetails.java
public class PersonDetails{
private int age;
private String eyeColor;
private String location;
private String educationLevel;
//getters and setters
}
主功能
List<Person> personsList = new ArrayList<>();
// loop starts
PersonDetails pd = new PersonDetails();
//set values
Person p = new Person();
//set values
personsList.add(p);
//loop ends
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]
定义元素数组, {
和}
代表数据类型的对象; 在这种情况下,人们。
然后,您可以获取带有所需字段的“ people”对象数组,以获取信息。 我有这个序列化和反序列化Java对象为json和visceversa,请尝试此。 希望对你有帮助。
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