公共类型<< classname>>>必须在其自己的文件“在Eclipse中出错 [英] "The public type <<classname>> must be defined in its own file" error in Eclipse

问题描述

我写了以下代码：

  package staticshow; 
 
 
 public class StaticDemo {
 static int a = 3; 
 static int b = 4; 
 
 static {
 System.out.println（Voila！Static block put into action）; 
} 
 
 static void show（）{
 System.out.println（a =+ a）; 
 System.out.println（b =+ b）; 
} 
} 
 
 public class StaticDemoShow {
 public static void main（）{
 StaticDemo.show（）; 
} 
} 
  

我收到错误消息：

 公共类型StaticDemo必须在自己的文件中定义
  

错误在第一行 public class StaticDemo {。为什么会发生，我该如何解决？请注意，我的项目名称为 StaticDemoShow ，程序包名称为 staticshow ，类名与代码中一样。 p>

编辑 - 只做一个类public或两个类都默认，我得到错误Selection不包含主类型。现在我应该怎么做？

解决方案

我们不能在一个文件中有两个公共类。 JVM无法理解，在一个文件中，我们只能写一个公共类。

  public class StaticDemo {
 
 static int a = 3; 
 static int b = 4; 
 
 static {
 System.out.println（Voila！Static block put into action）; 
} 
 
 static void show（）{
 System.out.println（a =+ a）; 
 System.out.println（b =+ b）; 
} 
 
} 
 class StaticDemoShow {
 public static void main（）{
 StaticDemo.show（）; 
} 
 
} 
  

I have written the following code:

package staticshow;


public class StaticDemo {
  static int a = 3;
  static int b = 4;

  static {
    System.out.println("Voila! Static block put into action");
  }

  static void show() {
    System.out.println("a= " + a);
    System.out.println("b= " + b);
  }
}

public class StaticDemoShow {
  public static void main() {
    StaticDemo.show(); 
  }
}

I am getting the error message:

The public type StaticDemo must be defined in its own file

error in the very first line public class StaticDemo {. Why is it happening and how can I resolve it? Note that my project name is StaticDemoShow, package name is staticshow and class names are as given in the code.

EDIT- After making just one class public or both the classes default, I am getting the error "Selection does not contain a main type". Now what should I do?

解决方案

We cant have two public classes in one file. The JVM cannot understand, in one file we must write one public class only.

public class StaticDemo {

    static int a = 3;
    static int b = 4;

    static {
        System.out.println("Voila! Static block put into action");
    }

    static void show() {
        System.out.println("a= " + a);
        System.out.println("b= " + b);
    }

}
 class StaticDemoShow {
    public static void main() {
        StaticDemo.show();
    }

}

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