Java基本面向對象的小費計算器

-1

我開始瞭解更多關於Java的知識，我正在嘗試編寫一個帶有用戶輸入的小費計算器，並顯示小費佔總數的10％和20％。我收到了一個無法解析的「無法對非靜態方法進行靜態引用」錯誤。Java基本面向對象的小費計算器

小費類：

public class Gratuity{ 

//variables 
private double total = 0; 
private double grat1 = 0; 
private double grat2 = 0; 

public Gratuity(float value){ 
    total = value; 
} 

start getters and setters 
public double getTotal() { 
    return total; 
} 

//method to do the calculations 
public void calcGrat(){ 
    grat1 = total * .10; 
    grat2 = total * .20; 
} 
    public double getGrat1(){ 
    return grat1; 
}     
}

與主方法的類：

import java.util.InputMismatchException; 
import java.util.Scanner; //import package to use the scanner input function 


//TestGrat main class contains method 
public class TestGrat { 

    Scanner keyboard = new Scanner(System.in); 

    //method to prompt user for total, double is total 
    public void askForInput(){ 

    try{ 
     System.out.println("Enter the total amount of your bill"); 
     total = keyboard.nextDouble(); 
    } 
    catch(InputMismatchException e){ 
    System.err.printf("Error, please try again. Program will now close"); 
     System.exit(0); 
}  

    } 
    public Scanner getKeyboard() { 
     return keyboard; 
    } 
    public void setKeyboard(Scanner keyboard) { 
     this.keyboard = keyboard; 
    } 


//main method 
public static void main(String[] args){ 

// asks for input in float form  

float value = askForInput(); 

//Creating the gratCalc object and storing value as a float (total)  
Gratuity gratCalc = new Gratuity(value); 

// get the total value and set as float 
float tot = (float)gratCalc.getTotal(); 

// converting the float value into string 
System.out.println("You have entered: " + Float.toString(tot)); 
gratCalc.calcGrat(); //sets grat 

// Displaying the options to user 
System.out.println("Below are the tips for %10 as well as %20 "); 


//getting the value and then displaying to user with toString  
float getNum = (float) gratCalc.getGrat1(); 
float getNum1 = (float) gratCalc.getGrat2(); 

// using the value of getNum as float to put into toString 
System.out.println("For %10: " + Float.toString(getNum)); 
System.out.println(" For %20: " + Float.toString(getNum1)); 
    } 

}

任何幫助，將不勝感激。謝謝！

來源

2015-12-04 Mr. Doe

錯誤是哪一行？這會有很大的幫助。 –

我的原始錯誤是在第36行float value = askForInput（）;執行一些回覆後，第15行出現新的錯誤（無法解析爲變量） –

askForInput()是你的班級TestGrat內。但是，在main()中，您直接調用它，就好像它是靜態的。你大概的意思是：

TestGrat test = new TestGrat(); 
float value = test.askForInput();

askForInput()也返回void，所以你可能要解決這個問題了。

來源

2015-12-04 21:12:14 whiskeyspider

謝謝！它仍然沒有看到第15行作爲變量，但是這固定了我原來的錯誤。 –

Java基本面向對象的小費計算器

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