Question

我正在研究一个项目，只是为java开发人员测试eclipse IDE。我是java的新手，所以我想知道它为什么不起作用，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

您正在使用main方法编写所有方法。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;
    }

return种类main方法应为void

Answer 2

从main方法中删除方法。如果您使用main作为应用程序入口点，则返回类型为void

public static void main(String[] args) {

Answer 3

它们需要在main方法之外，main方法的返回类型也是void：

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

 }
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;
}

令牌上的语法错误“（”，;令牌上预期的语法错误“，”，;令牌上预期的语法错误“）”,;预期

3 个答案: