Java 如何为我的领域对象设置标识符？

如何为我的领域对象设置标识符..我需要在Android应用程序的第二个活动中使用它进行查询。谢谢

学校目标：

public class School extends RealmObject {

@Required
private String SchoolID;
private String SchoolName;
private RealmList<Student> Students;


getters/setters

public RealmList<Student> getStudents() {
    return Students;
}

public void setStudents(RealmList<Student> students) {
    Students = students;
}

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您可以使用

@PrimaryKey

：

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你是说标识符是主键吗？我不确定…我需要用它从我的领域对象检索数据。它还与

@PrimaryKey私有字符串SchoolID相关
public class Student extends RealmObject{

@Required
private String StudentID;
private String StudentName;

getters/setters

}

public class Student extends RealmObject {

@PrimaryKey
private String StudentID;
private String StudentName;

// getters/setters

}