java - token 语法错误 "(", ; token ","上的预期语法错误，； token ")"上的预期语法错误，；预期的

Question

我正在开发一个项目，只是为了为 java 开发人员测试 eclipse IDE。我是java新手，所以我想知道为什么它不起作用，因为我已经知道该怎么做了。这是代码:

public class eclipse {

public static double main(String[] args) {
    // TODO Auto-generated method stub
    final double average(double number, double number2)
    {
        double number3 = (number + number2)/2;
                return number3;
    }
    final double suk(double number4, double number5)
    {
        double number6 = number4 + number5;
        return number6;
    }
    final double differenck(double number7, double number8)
    {
        double number9 = number7 - number8;
        return number9;
    }
    final double produck(double number10, double number11)
    {
        double number12 = number10*number11;
        return number12;
    }
  } 
}

这是出现的错误:

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
Syntax error on token "(", ; expected
Syntax error on token ",", ; expected
Syntax error on token ")", ; expected
Void methods cannot return a value
Syntax error on token "(", ; expected
Syntax error on token ",", ; expected
Syntax error on token ")", ; expected
Void methods cannot return a value
Syntax error on token "(", ; expected
Syntax error on token ",", ; expected
Syntax error on token ")", ; expected
Void methods cannot return a value
Syntax error on token "(", ; expected
Syntax error on token ",", ; expected
Syntax error on token ")", ; expected
Void methods cannot return a value

Answer 1

您正在主方法中编写所有方法。请从 main 方法中删除所有方法

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

  } 

 final double average(double number, double number2)
    {
        double number3 = (number + number2)/2;
           return number3;
    }
    final double suk(double number4, double number5)
    {
        double number6 = number4 + number5;
        return number6;
    }
    final double differenck(double number7, double number8)
    {
        double number9 = number7 - number8;
        return number9;
    }
    final double produck(double number10, double number11)
    {
        double number12 = number10*number11;
        return number12;
    }

并且main方法的return类型应该是void