java - 如何使用ArrayList动态添加多个学生数据？

Question

我想使用ArrayList动态添加多个学生数据，但它显示错误的打印 例如

STD.Student@1a2760f STD.Student@f4d6b3

public class Student {
            String strName;
            int iRollNum;


    public static void main(String[] args) {        



    ArrayList<Student> myArrayList=new ArrayList<Student>();
        Student student=new Student("Asha",4);
        myArrayList.add(student);
        Student student2=new Student("Asha",4);
        Student student3=new Student("Asha",4);
        Student student4=new Student("Asha",4);
        Student student5=new Student("Asha",4);
        myArrayList.add(student2);
        myArrayList.add(student3);
        myArrayList.add(student4);
        myArrayList.add(student5);

        for (int i = 0; i <myArrayList.size(); i++) {   


    System.out.println(myArrayList.get(i));
            }


            }

                public Student(String strName, int iRollNum) {
                this.strName = strName;
                this.iRollNum = iRollNum;
            }

请帮忙解决这个问题

Answer 1

@Override
public String toString() {
    return "("+strName+", "+iRollNum+")";
}

将此方法添加到 Student。 println 使用 toString 来确定如何显示字符串。默认情况下，它只显示类名称和一个随机数字。