java - 需要从接收扫描仪的对象/方法调用并打印它

Question

我需要能够填写“姓名、年龄、学校 GPA 和收到的最高字母成绩”。然而，我在执行这个看似简单的任务时遇到了困难。请帮忙!!

package schoolinfo;

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;


public class SchoolInfo {
void stu(String name, String
        age, String school, double gpa, char letter){

    System.out.println("You, " + name +", are " + age+ " years old and go to " + school + " Where you have a gpa of " + gpa + "and have recieved a highest letter grade of " + letter);

}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) throws IOException {
    // TODO code application logic here
    SchoolInfo student = new SchoolInfo();
    Scanner scan = new Scanner(System.in);
    boolean onoff = true;

    while(onoff){
          String countAge = " ";
    String countGPA = " ";
    String countName = " ", countSchool = " ";
    String countLetter = " ";
    String first;
    first = scan.nextLine();
        if(first.equals("quit")){
            break;
        }


        first = scan.nextLine();
       countName = first.substring(0, first.indexOf(" ", 2));
       countAge = first.substring(first.indexOf(" ", 2), first.indexOf(" ", 2));
       countSchool = first.substring(first.indexOf(" ", first.indexOf(" ", 2)), first.indexOf(" ", 2));
        countGPA = scan.nextDouble();
       countLetter = scan.next().charAt(first.lastIndexOf(" ") + 1);           
      System.out.println("test");
        student.stu(countName, countAge, countSchool, countGPA, countLetter);

    }
}

}

我想我需要添加更多详细信息才能发布此内容，但请帮忙!!!蒂亚!!

Answer 1

您传递给 stu 的参数与您在类中声明的参数不匹配。

void stu(String name, String
        age, String school, double gpa, char letter)

在 main 中，您已将变量声明为 String。

String countAge = " ";
String countGPA = " ";
String countName = " ", countSchool = " ";
String countLetter = " ";

但是您随后尝试以 double 形式检索 countGPA 的输入。

countGPA = scan.nextDouble();

您可能应该将 countGPA 声明为 double 并将 countLetter 转换为 char 或更改类方法将其作为 String 接受。