java - 似乎无法返回值(value)

我刚刚编辑我的帖子以更新我的代码...编译时仍显示一条错误消息，提示“找不到符号”。我从未见过此错误，所以我不确定如何调试它，非常感谢大家的帮助！

public class HealthRecord {
    private int ID;  // stores ID number
    private String last; // stores last name
    private String first; //stores first name
    private double height; // stores height
    private double weight; // stores weight
    private double bmi;// i may need to create the bmi variable so that it can be stored (weight / (height*height)) *703;

    public HealthRecord( int ID, String last, String first, double height, double weight)
    {
        this.ID = ID;
        this.last = last;
        this.first = first;
        this.height = height;
        this.weight = weight;
        this.bmi = bmi;
    }

    public int getID()    {
        return ID;
    }

    public void setID(int ID)    {
        this.ID = ID;
    }

    public String getLast() {
        return last;
    }

    public void setLast(String last)    {
        this.last = last;
    }

    public String getFirst()    {
        return first;
    }

    public void setFirst(String last) {
        this.first = first;
    }

    public double getheight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public double getWeight() {
        return weight;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }

    public double getbmi() {
        return (weight / (height*height)) *703;
    }

    public void setbmi(double bmi) {
        this.bmi = bmi;
    }
}

下一班

    import java.util.Scanner;
import java.io.File;

public class OpenFile
    {
        private Scanner input;

        public void openFile() throws Exception
        {
        input = new Scanner(new File("medrec.txt")); // opens the text file to be read (weight / (height*height)) *703);


    }

     public void readFile()
     {
        int ID;  // stores ID number
        String last; // stores last name
        String first; //stores first name
        double height; // stores height
        double weight; // stores weight

        input.nextLine();

        while(input.hasNextLine())
            {
                ID = input.nextInt();
                last = input.next();
                first = input.next();
                height = input.nextDouble();
                weight = input.nextDouble();

                HealthRecord healthrecord= new HealthRecord(ID,last,first,height,weight);


                System.out.printf("%d", healthrecord.getID(), healthrecord.getBmi());
            }
        }

    public void closeFile()
    {
        input.close();
    }


}

最佳答案

更换

System.out.printf("%d %d", HealthRecord.getID, HealthRecord.getBmi);

与

System.out.printf("%d %f", healthrecord.getID(), healthrecord.bmi());

使用您创建的healthrecord实例。方法getID需要括号。同样，getBmi也不存在。当前您有bmi。



在旁边：

目前，此代码无法编译。 openFile中的所有方法都是实例方法。您需要创建一个实例并使用：

Openfile myOpenfile = new Openfile();
myOpenfile.openFile();
myOpenfile.readFile();
myOpenfile.closeFile();

Java命名约定表示类名以大写字母开头，例如Openfile



编辑：

在更新的文件中，getBmi不存在，而是getbmi：

System.out.printf("%d %f", healthrecord.getID(), healthrecord.getbmi());
                                                              ^

您可能需要将方法重命名为getBmi以遵循方法命名约定。