Java 新手并不断出现语法错误

Question

我是编码新手，我不断收到关于标记“.”的语法错误，; 在第 21、22 和 23 行（System.out.println）。我可以弄清楚我们正是错误是？

// calculator for the price of milk

import java.util.Scanner;

public class DairyCalculator

{

 public static void main( String [] args)

 {

    double cartonhold = 3.78;

    double productioncost = 0.38;

    double cartonprofit = 0.27;

    Scanner sc = new Scanner(System.in);

    System.out.print( "Enter how many liters of milk was produced; "); // input

    double produced = sc.nextInt();

    double cartonsneeded = produced / cartonhold;

     int System.out.println( "Milk cartons needed" = cartonsneeded);

     double System.out.println("Cost of production" = produced * productioncost);

     double System.out.println("Profit" = produced * cartonprofit);

    sc.close();

   }

}

Answer 1

语句int double前不需要等System.out...，而且你的语句格式不正确，见下文System.out.println("Milk cartons needed " + cartonsneeded);System.out.println("Cost of production " + (produced * productioncost));System.out.println("Profit " + (produced * cartonprofit));此外，您可能想重新考虑是否要将变量保存为int或double值。

Answer 2

您需要先了解 Java 语言的语法和基础知识。从您的代码来看，您似乎是 Java 语言的新手。您可以在代码中进行以下更正：System.out.println( "Milk cartons needed ="+ cartonsneeded);            System.out.println("Cost of production ="+ produced * productioncost);         System.out.println("Profit = "+produced * cartonprofit);