Question

还有一个错误也表示错误：';'预期。这是代码。我检查了格式，如果我遗漏了什么，但没有。 Void属于主类以外的类。

void buy1(){
        System.out.println("Product Code 1: Paracetamol");
        System.out.println("Enter quantity: ");
        quantity = machine1.nextInt();
        price = paracetamol*quantity;
        System.out.println("Price is " +price);
        System.out.println("Enter cash amount: ");
        cash = machine1.nextInt();
        total = cash-price;
        System.out.println("Total: "+total);
    }

最多购买5然后当我运行它时说：

    drugstore1.java:11: error: illegal start of expression
    void buy1(){
    ^
drugstore1.java:11: error: ';' expected
    void buy1(){
             ^

我不知道出了什么问题。救命？：（

以下是整个代码：

import java.util.Scanner;
import java.util.*;

class Machine {
    public static void main(String args[]) {
    Machine machine1 = new Machine(System.in);
    int medicine, medicine1, medicine2, medicine3, medicine4, medicine5, amount, change, cash, price, price2, price3, price4, price5, totalquantity, quantity, quantity2, quantity3, quantity4, quantity5, totalamount, total, total2, total3, total4, total5;
    int paracetamol=7, biogesic=6, alaxan=13, neozep=6, amoxicilin=13;
    String answer;   
    void buy1(){
        System.out.println("Product Code 1: Paracetamol");
        System.out.println("Enter quantity: ");
        quantity = machine1.nextInt();
        price = paracetamol*quantity;
        System.out.println("Price is " +price);
        System.out.println("Enter cash amount: ");
        cash = machine1.nextInt();
        total = cash-price;
        System.out.println("Total: "+total);
    }   

    void buy2(){ 
        System.out.println("Product Code 2: Biogesic");
        System.out.println("Enter quantity: ");
        quantity2 = machine1.nextInt();
        price2 = biogesic*quantity2;
        System.out.println("Price is " +price2);
        System.out.println("Enter cash amount: ");
        cash = machine1.nextInt();
        total2 = cash-price2;
        System.out.println("Quantity of purchased items: " +quantity2+  " \nCash amount is " +cash+ "\nTotal amount is " +total2);
    }

    void buy3(){    
        System.out.println("Product Code 3: Alaxan");
        System.out.println("Enter quantity: ");
        quantity3 = machine1.nextInt();
        price3 = alaxan*quantity3;
        System.out.println("Price is " +price3);
        System.out.println("Enter cash amount: ");
        cash = machine1.nextInt();
        total3 = cash-price3;
        System.out.println("Quantity of purchased items: " +quantity3+  " \nCash amount is " +cash+ "\nTotal amount is " +total3);
    }

    void buy4(){
        System.out.println("Product Code 4: Neozep");
        System.out.println("Enter quantity: ");
        quantity4 = machine1.nextInt();
        price4 = neozep*quantity4;
        System.out.println("Price is " +price4);
        System.out.println("Enter cash amount: ");
        cash = machine1.nextInt();
        total4 = cash-price4;
        System.out.println("Quantity of purchased items: " +quantity4+  " \nCash amount is " +cash+ "\nTotal amount is " +total4);
        }

    void buy5(){
        System.out.println("Product Code 5: Amoxicilin");
        System.out.println("Enter quantity: ");
        quantity5 = machine1.nextInt();
        price5 = amoxicilin*quantity5;
        System.out.println("Price is " +price5);
        System.out.println("Enter cash amount: ");
        cash = machine1.nextInt();
        total5 = cash-price5;
        System.out.println("Quantity of purchased items: " +quantity5+  " \nCash amount is " +cash+ "\nTotal amount is " +total5);
    }

        void addproduct(){
        System.out.println("Add product: y/n"); 
        String answer= machine1.nextLine();
    }
}   
public class drugstore1
    {
    public static void main(String args[]) { 
    do {
        System.out.println("Enter Product Code: ");
        medicine = machine1.nextInt();
            if(medicine==1) 
                {
                    machine1.buy1();
                    machine1.addproduct(); 
                } 
            if(medicine==2)
                {
                    machine1.buy2();
                    machine1.addproduct();
                } 
    }while(answer.equalsIgnoreCase("y"));
    }

}

Answer 1

在另一种方法中声明方法是违法的。

所以不是以下......

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

public foo(){
    // code
}

做...

PdfTable

Answer 2

您的方法chassisAutomobile，void buy1(){}，void buy2(){} ....应该在主要

之外

void buy3(){}

Java：错误：非法表达式启动

2 个答案: