Question

例如，如果我将20个学生详细信息存储在数组中，并且在运行时给出值，最后我想使用他们唯一的滚动号显示特定的学生详细信息。我如何使用java程序中的数组调用和显示学生详细信息

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[] 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();
    }
}

Answer 1

如果学生的卷号是数组中的值，则可以循环遍历数组数据并检查特定的卷号。如果卷号匹配，则打印该值。像这样：

int rollnumber = ip1.nextInt();
for (StudInfo s : studInfos)
    if (s.regno == rollnumber)
        s.display();

（注意：您必须公开StudInfo.regno，或使用公共getter方法。）

从学生详细信息如何使用唯一的卷号来调用和显示存储在数组中的特定细节

1 个答案: