Question

不使用数组..如果学生人数= 2，我使用getdata（）给两个学生信息，最后我想显示学生1和学生2的信息。但这里只显示最后输入的学生信息，即学生2信息......你能解决这个问题吗......！

import java.util.Scanner;

public class StudInfo
{
int regno;
String name,course;
int eng,tam,mat,tot;
double avg;
//*
void getdata()
{
Scanner ip=new Scanner(System.in);
System.out.print("\n\n Enter Roll No.\t:\t");
regno=ip.nextInt();
System.out.print("\n Enter Name   \t:\t");
name=ip.next();
System.out.println();
System.out.print(" Enter Marks [English, Tamil and Maths Marks out of 100] : ");
eng=ip.nextInt();
tam=ip.nextInt();
mat=ip.nextInt();
}
//*
void display()
{
tot=eng+tam+mat;
avg=tot/3;
System.out.println("\n"+"\n Roll No.\t:\t"+regno+
    "\n Name   \t:\t"+name+
    "\n English\t:\t"+eng+
    "\n Tamil   \t:\t"+tam+
    "\n Maths   \t:\t"+mat+
    "\n Total   \t:\t"+tot+
    "\n Average\t:\t"+avg);


System.out.print(" Grade   \t:\t");
if((eng>=50)&&(tam>=50)&&(mat>=50))
{
if(avg>=91) System.out.print("O");
else if(avg>=81) System.out.print("A");
else if(avg>=71) System.out.print("B");
else if (avg>=61) System.out.print("C");
else if(avg>=51) System.out.print("D");
else System.out.print("Fail");
}
else System.out.print("Fail");
System.out.println();
}
//*
public static void main(String arg[])
{
StudInfo s=new StudInfo();
int maxs,nos;
Scanner ip1=new Scanner(System.in);
System.out.print("\nEnter No. of Students : "); 
nos=ip1.nextInt();
for(maxs=1;maxs<=nos;maxs++) 
{
System.out.println("\nWelcome to Student database");
System.out.print("\n Enter Student [ "+maxs+" ] details");
s.getdata();
}
s.display();
}
}

我想显示输入的学生信息数量..但是这里显示最后输入的学生信息..你能解决这个问题吗？

Answer 1

试试这个：

public static void main(String[] args) {
    int maxs, nos;
    Scanner ip1 = new Scanner(System.in);
    System.out.print("\nEnter No. of Students : ");
    nos = ip1.nextInt();
    StudInfo[] studInfos = new StudInfo[nos];
    for (maxs = 0; maxs < nos; maxs++) {
        System.out.println("\nWelcome to Student database");
        System.out.print("\n Enter Student [ " + (maxs + 1) + " ] details");
        studInfos[maxs] = new StudInfo();
        studInfos[maxs].getdata();
    }
    for (StudInfo s : studInfos) {
        s.display();
    }
}

希望这会有所帮助。

Answer 2

使用以下代码更改主要方法

public static void main(String arg[])
{
    List<StudInfo> students = new ArrayList<StudInfo>();
    int maxs,nos;
    Scanner ip1=new Scanner(System.in);
    System.out.print("\nEnter No. of Students : "); 
    nos=ip1.nextInt();
    for(maxs=1;maxs<=nos;maxs++) 
    {
        System.out.println("\nWelcome to Student database");
        System.out.print("\n Enter Student [ "+maxs+" ] details");
        StudInfo s = new StudInfo();
        s.getdata();
        students.add(s);
    }
    for (StudInfo s : students) {
        s.display();
    }
}

这将打印所有学生列表。

在您的代码中，您只是将最后的学生详细信息存储在s 参考中。这会将所有StudInfo详细信息存储在students 列表

中

如何在给定的java程序中完全显示输入的学生信息

2 个答案: