Json是一種輕量級(jí)的數(shù)據(jù)交換格式，它支持嵌套、數(shù)組和基本數(shù)據(jù)類(lèi)型。在Java中，我們可以使用Json解析庫(kù)來(lái)解析Json數(shù)據(jù)，其中最常用的是Gson庫(kù)。下面通過(guò)一個(gè)例子來(lái)展示如何解析Json中的數(shù)組對(duì)象數(shù)組對(duì)象。

//Json數(shù)據(jù)格式
{
"students": [
{
"name": "Tom",
"age": 18,
"courses": [
{
"courseName": "Math",
"score": 90
},
{
"courseName": "English",
"score": 80
}
]
},
{
"name": "Lily",
"age": 20,
"courses": [
{
"courseName": "Physics",
"score": 85
},
{
"courseName": "Computer Science",
"score": 95
}
]
}
]
}
//Student類(lèi)
public class Student {
private String name;
private int age;
private Listcourses;
//getter and setter
}
//Course類(lèi)
public class Course {
private String courseName;
private int score;
//getter and setter
}
//解析Json
Gson gson = new Gson();
JsonObject jsonObject = gson.fromJson(jsonStr, JsonObject.class);
JsonArray studentArray = jsonObject.getAsJsonArray("students");
ListstudentList = new ArrayList<>();
for (JsonElement jsonElement : studentArray) {
JsonObject studentObject = jsonElement.getAsJsonObject();
String name = studentObject.get("name").getAsString();
int age = studentObject.get("age").getAsInt();
JsonArray courseArray = studentObject.getAsJsonArray("courses");
ListcourseList = new ArrayList<>();
for (JsonElement courseElement : courseArray) {
JsonObject courseObject = courseElement.getAsJsonObject();
String courseName = courseObject.get("courseName").getAsString();
int score = courseObject.get("score").getAsInt();
Course course = new Course();
course.setCourseName(courseName);
course.setScore(score);
courseList.add(course);
}
Student student = new Student();
student.setName(name);
student.setAge(age);
student.setCourses(courseList);
studentList.add(student);
}

在以上例子中，我們使用Gson庫(kù)來(lái)解析Json字符串。首先將Json字符串轉(zhuǎn)為JsonObject對(duì)象，然后通過(guò)getAsJsonArray方法獲取學(xué)生數(shù)組，遍歷數(shù)組得到每個(gè)學(xué)生的Json對(duì)象。根據(jù)Json對(duì)象的字段名和類(lèi)型，創(chuàng)建對(duì)應(yīng)的Java對(duì)象，將屬性值設(shè)置到對(duì)象中。最終得到List<Student>對(duì)象，包含所有學(xué)生的信息。