如何解决“错误：无法找到或加载主类” [英] How to solve"error: could not find or load main class"

问题描述

我是java编程的新手，我编写了一个简单的代码：

  package  test1; 
 
  public   class  Test1 {
 
  public  Test1（）{
  public   static   void  test（ int  num1， int  num2， int  num3）{
 num1 =  20 ; 
 num2 =  22 ; 
 num3 = num1 + num2; 
 System.out.println（num3）; 
} 
} 
 
} 

当我尝试运行它时，我收到错误错误：无法在日食霓虹灯中查找或加载主类。



我尝试过的方法：



我试过运行这个程序，并用cmd打招呼世界程序，我又得到了这个错误。

我已经搜索了很多，但没有一个解决方案有效。

解决方案

首先，我注意到你正在尝试使用嵌套函数遗憾的是，在Java中，它们在Java语言中完全不受支持。

  public  Test1（）{
  public  静态  void  test（ int  num1， int  num2， int  num3）{

您需要终止构造函数，然后启动另一个函数。有一个 lambda函数的概念[ ^ ]，但这是别的。

我在代码中看到的另一件事是你没有遵循Java程序中main函数的标准。如果您阅读了 Java的主要功能的标准[ ^ ]，你会发现该函数必须声明为，

  public   static   void  main（ String  [] args）{} 

这是您的程序必须遵循的标准。请尝试使用以下代码：

  public   class  Test1 {
  public  Test1（）{
} 
 
  //  添加此 
  public   static   void  main（ String  [] args）{
  //  调用函数 
 test（ 0 ， 0 ， 0 ）;  //  因为您稍后会设置值。  
} 
 
  public   static   void  test（ int  num1， int  num2， int  num3）{
 num1 =  20 ; 
 num2 =  22 ; 
 num3 = num1 + num2; 
 System.out.println（num3）; 
} 
} 

这应该有效，除非你的Java编译器期望另一个类成为你程序的主类。其次，从这里开始学习Java， Trail：学习Java语言（The Java™Tutorials） [ ^ ]，我非常喜欢从这里学习Java基础知识并申请它们在NetBeans中。 NetBeans是一个适用于Java初学者的简单IDE，有时Eclipse可能很难。



如需更多信息，请查看：

教训：仔细看看Hello World！应用程序（Java™教程>入门） [ ^ ]

I am new to java programming and I wrote a simple code :

package test1;

public class Test1 {

	public Test1() {
		public static void test (int num1,int num2,int num3) {
			num1= 20 ;
			num2= 22 ;
			num3= num1+num2 ;
			System.out.println(num3);
		}
	}

}

and when I try to run it I get the error "Error: Could not find or load main class" in eclipse neon.

What I have tried:

I tried running this program and also hello world program with cmd and I get this error again.
I have searched alot but none of the solutions worked.

解决方案

First of all, I noticed that you are trying to use nested functions in Java, sadly, they are not at all supported in the Java language.

public Test1() {
public static void test (int num1,int num2,int num3) {

You need to terminate the constructor, and then start another function. There is a concept of lambda functions[^], but that is something else.
Another thing that I saw in your code was that you are not following the standards for main function in Java programs. If you read the standard for Java's main function[^], you will find out that the function has to be declared as,

public static void main(String[] args) { }

This is the standard that your program must follow. Try the following code instead,

public class Test1 {
   public Test1() {
   }

   // Add this
   public static void main(String[] args) {
      // Call your function
      test(0, 0, 0); // Because you are setting values later. 
   }

   public static void test (int num1,int num2,int num3) {
      num1= 20 ;
      num2= 22 ;
      num3= num1+num2 ;
      System.out.println(num3);
   }
}

This should work, unless your Java compiler is expecting another class to be the main class for your program. Secondly, start learning Java from here, Trail: Learning the Java Language (The Java™ Tutorials)[^], I really enjoyed learning the Java basics from here and apply them in NetBeans. NetBeans is a simple IDE for Java beginners, Eclipse can be hard sometimes.

For more, please look:
Lesson: A Closer Look at the "Hello World!" Application (The Java™ Tutorials > Getting Started)[^]

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