[英]Adding objects of a class to an ArrayList in another class
我試圖將一個名為Student的類的對象添加到另一個名為StudentClass的類的Arraylist中。 我已經初始化了列表,但是在解決如何向ArrayList添加對象時遇到了麻煩
學生班代碼
public class StudentClass
{
List<Student> studentList;
private String studentName;
private int lengthOfString;
public StudentClass()
{
super();
studentList = new ArrayList<>();
}
public void addStudent(String aName)
{
String objt = new String(name, mark);
studentList.add(Student);
}
學生代碼
public class Student
{
private String name;
private int mark;
public Student(String aName)
{
super();
this.name = aName;
this.mark = -1;
嘗試這個:
public void addStudent(String aName) {
studentList.add(new String(aName));
}
此外,Student類的構造函數也不接受標記作為第二個參數,至少不接受您發布的代碼。
似乎您的錯誤在這里:
String objt = new String(name, mark);
studentList.add(Student);
改寫這個:
Student objt = new Student(name, mark);
studentList.add(objt);
您需要創建一個新的Student
對象,然后將其添加到列表中:
public void addStudent(String aName) {
Student student = new Student(aName);
studentList.add(student);
}
從您提供的代碼中並不清楚如何設置mark
字段,但是可以將其傳遞給Student
結構和/或添加getter和setter。
這應該工作。
import java.util.*;
public class StudentClass
{
List<Student> studentList;
private String studentName;
private int lengthOfString;
public StudentClass()
{
super();
studentList = new ArrayList<>();
}
public void addStudent(String aName) {
Student student = new Student(aName);
studentList.add(student);
}
}
public class Student
{
private String name;
private int mark;
public Student(String aName)
{
super();
this.name = aName;
this.mark = -1;
}
}
我不清楚您打算如何處理商標?
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