Java Puzzler-原因是什么？ [英] Java Puzzler- What is the reason?

问题描述

我写了以下代码。

class String { 

    private final java.lang.String s; 

    public String(java.lang.String s){ 
        this.s = s; 
    } 

    public java.lang.String toString(){ 
        return s; 
    } 

    public static void main(String[] args) { 
        String s = new String("Hello world"); 
        System.out.println(s); 
    } 
}

当我执行它时，得到以下错误

When I execute it, get following error

The program compiled successfully, but main class was not found.
  Main class should contain method: public static void main (String[] args).

为什么是这样？虽然主要方法被定义为什么系统不读/ ？

Why is it so?... though main method is defined why system is not reading/ recognizing it ?

推荐答案

public static void main(String[] args) {

因为您必须使用 java.lang.String 你自己。在你的main方法中，你使用的 String 实际上是定义的自定义 String code> java.lang.String 。

Becuase you must use a java.lang.String, not your own. In your main method, the String you're using is actually the custom String that was defined, not a real java.lang.String.

这里是代码，澄清一下：

Here is the code, clarified a bit:

class MyString { 

    private final String s; 

    public MyString(String s){ 
        this.s = s; 
    } 

    public String toString(){ 
        return s; 
    } 

    public static void main(MyString[] args) { // <--------- oh no!
        MyString s = new MyString("Hello world"); 
        System.out.println(s); 
    } 
}

所以，你可以从这个谜题中学到的教训是：不要将你的类命名为其他常用的类！

So, the lesson that you can learn from this puzzle is: don't name your classes as other commonly used classes!

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