类WH是公共的, 应在名为 WH.java 的文件中声明 public class WH { 谢谢！

Question

import java.util.Scanner;

public class WH {

        public static void main(String[] args) {
            int A,B,C;double SUM;
            Scanner scanner=new Scanner(System.in);
            System.out.println("请输入你的三个成绩");
            A=scanner.nextInt();
            if (A>=0&&A<=100){
                B= scanner.nextInt();if (B>=0&&B<=100){
                    C= scanner.nextInt();
                    if (C>=0&&C<=100){
                        SUM=A*0.2+B*0.3+C*0.5;
                        System.out.println("你最终的成绩为"+SUM);
                    }
                    
                }
                

            }
            

        }
    }

Answer 1

局部变量名不要大写