Question

我正在尝试在列表employ上存储一组对象。但是我在employ.addAll()收到错误，我尝试employ.add()但我仍然收到错误。

import java.util.ArrayList;

public class Employee {
public String FullName;
public float wage;
public int ID;
ArrayList<Employee> employ = new ArrayList<Employee>();

Employee(String name, float wage, int ID){
    this.FullName = name;
    this.wage = wage;
    this.ID = ID;
}

Employee e = new Employee("Tony", 1245, 2222);

employ.addAll(e); //here is where I a getting the error

}

Answer 1

您要添加一个Employee，因此请使用add，而不是addAll：

Employee e = new Employee("Tony", 1245, 2222);
employ.add(e);

除此之外，employ.add(e);应该在某个方法中。

Answer 2

employ.addAll()需要一个集合，用于添加单个元素employ.add()。

import java.util.ArrayList;

public class Employee {
    public String FullName;
    public float wage;
    public int ID;

    Employee(String name, float wage, int ID){
        this.FullName = name;
        this.wage = wage;
        this.ID = ID;
    }

    public static void main(String[] args) {
        ArrayList<Employee> employ = new ArrayList<Employee>();
        Employee e = new Employee("Tony", 1245, 2222);
        employ.add(e);
    }
}

在Arraylist上存储对象集合

2 个答案: