嗨，需要帮助伙伴们！新手在这里。如何在Studentinfo中打印所有学生名？ BOBbless [英] Hi, Need Help Guys! Newbie Here. How Can I Print All Studentname In Studentinfo? BOBbless

问题描述

 Public  class  StudentInfo {
  String  studentName; 
  String  barrowedBooks; 
 字符串日期; 
  String  expiredDate; 
 
 
  void  listOfStudent（）{
  如何在StudentInfo中打印所有studentName 
 
} 
 
} 
 
 
 Public  class  InputStudentInfo {
 
 StudentInfo studentReg，justin，gian; 
 
 justin =  new  StudentInfo（）; 
 gian =  new  StudentInfo（）; 
 studentReg =  new  StudentInfo（）; 
 
 
 
 justin.studentName =   Justin Lazaro; 
 justin.barrowedBooks =（  English，Math）; 
 
 
 gian.studentName =   Gian Acuna; 
 gian.barrowedBooks =  数学; 
 
} 

解决方案

我建​​议使用阵列 [ ^ ]。

  class  InputStudentInfo {
 
  //    
  public   void  main（ String  [] args）
 {
  //  声明要存储的ArrayList学生列表 
 ArrayList< studentInfo> students =  new  ArrayList< studentInfo> ;; 
 
 StudentInfo student =  new  StudentInfo（）; 
  //   1  
 student.studentName =   Justin Lazaro; 
 student.barrowedBooks =（  English，Math）; 
  //  添加到列表 
 students.Add（student）; 
  //   2  
 student =  new  StudentInfo（）; 
 student.studentName =   Gian Acuna; 
 student.barrowedBooks =  数学; 
 students.Add（学生）; 
  //  等。 
 
  //  进一步......  
  //  用于（...）循环 
  //  迭代学生的集合 
} 
} 

如需了解更多信息，请参阅： for-each循环 [ ^ ]



顺便说一下：为什么要将日期声明为字符串？

  String  date; 
  String  expiredDate; 

Java知道日期数据类型 [ ^ ]。

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

System.out.println （studentName.get（i））;



}







无法在arraylist中打印所有值

Public class StudentInfo {
String studentName;
String barrowedBooks;
String date;
String expiredDate;


void listOfStudent(){
  "How can i print all studentName in StudentInfo " 

}

}


Public class InputStudentInfo {

	StudentInfo studentReg, justin, gian;
		
		justin = new StudentInfo();
		gian = new StudentInfo();
		studentReg = new StudentInfo();
		
	
			
		justin.studentName = "Justin Lazaro";
		justin.barrowedBooks = ("English, Math");
		
		
		gian.studentName = "Gian Acuna";
		gian.barrowedBooks = "Math";
		
}

解决方案

I'd suggest to use ArrayList[^].

class InputStudentInfo {
 
    //
    public void main (String[] args)
    {
        //declare ArrayList to store students list
        ArrayList<studentInfo> students = new ArrayList<studentInfo>;

        StudentInfo student = new StudentInfo();
        //1
        student.studentName = "Justin Lazaro";
        student.barrowedBooks = ("English, Math");
        //add to list
        students.Add(student);     
        //2	
        student = new StudentInfo();
        student.studentName = "Gian Acuna";
        student.barrowedBooks = "Math";
        students.Add(student);
        //etc.

        //further...
        // use for(...) loop
        // to iterate through the collection of student
    }
}

For further information, please see: The for-each loop[^]

By The Way: Why do you declare date as as a string?

String date;
String expiredDate;

Java knows date data type[^].

for (int i=0; i< studentName.size(); i++){
System.out.println(studentName.get(i));

}



bro i cant print all value in arraylist

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