Java 使用文件输入查找两个最高分数
因为我们还没有讨论数组和列表,他说要坚持使用循环和if语句。 我似乎不知道如何让它显示文本文件中两个最高分数的名字。我也不知道如何让它显示两个相同的分数。以下是我迄今为止所做的工作:Java 使用文件输入查找两个最高分数,java,Java,因为我们还没有讨论数组和列表,他说要坚持使用循环和if语句。 我似乎不知道如何让它显示文本文件中两个最高分数的名字。我也不知道如何让它显示两个相同的分数。以下是我迄今为止所做的工作: package lab06; import java.util.*; import java.io.*; public class Lab06 { public static void main(String[] args) throws Exception { Scanner lab06txt =
package lab06;
import java.util.*;
import java.io.*;
public class Lab06 {
public static void main(String[] args) throws Exception {
Scanner lab06txt = new Scanner(new File("Lab06.txt"));
Scanner duplicateScanner = new Scanner(new File("Lab06.txt"));
int totalstudents = 0;
int grade = 0;
int grade2 = 0;
int record = 0;
int Highest = 0;
int Highest2 = 0;
int ACounter = 0;
int BCounter = 0;
int CCounter = 0;
int DCounter = 0;
int FCounter = 0;
double average = 0;
String lastName = "";
String lastNameHigh = "";
String lastNameHigh2 = "";
String firstName = "";
String firstNameHigh = "";
String firstNameHigh2 = "";
while (lab06txt.hasNext()){
record ++;
totalstudents++;
lastName = lab06txt.next();
firstName = lab06txt.next();
grade = lab06txt.nextInt();
{
average += grade;
if (grade >= Highest){
Highest = grade;
firstNameHigh = firstName;
lastNameHigh = lastName;
}
}
{
if ((grade >= 90) && (grade <= 100))
{
ACounter++;
}
if ((grade >= 80) && (grade <= 89))
{
BCounter++;
}
if ((grade >= 70) && (grade <= 79))
{
CCounter++;
}
if ((grade >= 60) && (grade <= 69))
{
DCounter++;
}
if ((grade < 60))
{
FCounter++;
}
if ((grade < 0) || (grade > 100))
{
System.out.print("Score is out of bounds in record " + record + ": " + lastName + " "+ firstName + " " + grade + ".\nProgram ending\n");
return;
}
}
}
while(lab06txt.hasNext())
{
lastName = lab06txt.next();
firstName = lab06txt.next();
grade2 = lab06txt.nextInt();
if(grade2 > Highest2 && grade2 < Highest){
Highest2 = grade2;
firstNameHigh2 = firstName;
lastNameHigh2 = lastName;
}
}
System.out.println("Total students in class: " +totalstudents);
System.out.println("Class average: " + average/totalstudents);
System.out.println("Grade Counters: ");
System.out.println("A's B's C's D's F's");
System.out.printf(ACounter + "%7d %7d %8d %7d\n", BCounter,CCounter,DCounter,FCounter);
System.out.println("");
System.out.println("Top Two Students: \n");
System.out.printf(lastNameHigh + " " + firstNameHigh + "%15d \n", Highest);
System.out.printf(lastNameHigh2 + " " + firstNameHigh2 + "%15d\n", Highest2);
}
lab06包装;
导入java.util.*;
导入java.io.*;
公共类Lab06{
公共静态void main(字符串[]args)引发异常{
Scanner lab06txt=新扫描仪(新文件(“Lab06.txt”);
Scanner duplicateScanner=新的扫描仪(新文件(“Lab06.txt”);
学生总数=0;
int等级=0;
智力2级=0;
int记录=0;
int最高=0;
int-Highest2=0;
int a计数器=0;
int BCounter=0;
int CCounter=0;
int-DCounter=0;
int FCounter=0;
双平均=0;
字符串lastName=“”;
字符串lastNameHigh=“”;
字符串lastNameHigh2=“”;
字符串firstName=“”;
字符串firstNameHigh=“”;
字符串firstNameHigh2=“”;
while(lab06txt.hasNext()){
记录++;
学生++;
lastName=lab06txt.next();
firstName=lab06txt.next();
grade=lab06txt.nextInt();
{
平均+=等级;
如果(等级>=最高){
最高=等级;
firstName高=firstName;
lastName高=lastName;
}
}
{
如果((等级>=90)和&(等级=80)和&(等级=70)和&(等级=60)和&(等级100))
{
System.out.print(“记录“+record+”:“+lastName+”“+firstName+”“+grade+”\n程序结束时的分数超出范围”);
返回;
}
}
}
while(lab06txt.hasNext())
{
lastName=lab06txt.next();
firstName=lab06txt.next();
grade2=lab06txt.nextInt();
如果(2级>最高2级和2级<最高){
最高2级=2级;
firstNameHigh2=firstName;
lastNameHigh2=lastName;
}
}
System.out.println(“全班学生:+totalstudents”);
System.out.println(“班级平均:+平均/学生总数”);
System.out.println(“等级计数器:”);
System.out.println(“A的B的C的D的F的”);
System.out.printf(一个计数器+%7d%7d%8d%7d\n“,b计数器,c计数器,d计数器,f计数器);
System.out.println(“”);
System.out.println(“前两名学生:\n”);
System.out.printf(lastNameHigh+“”+firstNameHigh+“%15d\n”,最高);
System.out.printf(lastNameHigh2+“”+firstNameHigh2+“%15d\n”,最高位2);
}
}代码的两个部分:
firstName = firstNameHigh;
lastName = lastNameHigh;
应该是:
firstNameHigh = firstName;
lastNameHigh = lastName;
代码的两个部分:
firstName = firstNameHigh;
lastName = lastNameHigh;
应该是:
firstNameHigh = firstName;
lastNameHigh = lastName;
请学习类、方法和属性名称的通用(特别是用于名称的大小写)并一致使用它们。您混淆了变量的赋值。看看这一行,例如
firstName=firstNameHigh如果我正确解释了您的代码,代码>应该是另一种方式。谢谢!真不敢相信这么简单啊哈哈。请学习类、方法和属性名称的通用(特别是用于名称的大小写)并一致使用它们。您混淆了变量的赋值。看看这一行,例如firstName=firstNameHigh如果我正确解释了您的代码,代码>应该是另一种方式。谢谢!真不敢相信这么简单啊哈哈,谢谢你!这修复了显示名称的问题。但现在我遇到了另一个问题。对于分数,第二高的分数显示为97,而第二高的分数实际为98。还有,我该如何让它显示重复的分数。不使用数组查找重复项会有点乏味,但您可以使用一种方法或一段代码来创建一个新的scanner duplicateScanner=new scanner(新文件(“Lab06.txt”);看看当前的数字是否出现了2次或更多次,使之成为一个重复是的,我被卡住了。在我的教授提供的样本中显示:前两名学生:Glaude Jeanette 99 Florez Katarzyna 98。但由于某种原因,我的代码无法分配正确的第二高分,所以我得到了Glaude Jeanette 99 Klein Harry 97。我也会试一试,看看会发生什么。当你找到第二高的分数时,如果(grade>Highest2&&grade