java编译如何在另一个类中创建一个类的对象？ [英] How java compiles creates objects of one class in another class?

问题描述

我是Java的新手，遇到了一个问题，即java编译器如何在另一个类中创建一个类的对象。例如：



我的A级如下：

  class  A {} 
 
  //  我有B级主要方法： 
 
  class  B {
 
  public   static   void  main（ String  [] args）{
 
 a a =  new  A（）; 
 
 System.out.println（a）; 
 
} 
} 

这是一个问题：我在一个单独的txt文件中编写了A类，在另一个txt文件中编写了B类。当我编译 B类编译器如何知道类A 存在，因为没有的痕迹 B类中的A类。我们没有给出 A类的路径，我们并没有给出 A类存在的任何线索。但是java编译器如何知道并在 class B 中为 Class A 创建对象。这可能是一个愚蠢的问题，但它没有让我在没有答案的情况下继续前进。提前致谢。



我的尝试：



我有A级如下：

  class  A {} 

我有B级主要方法：

B级{



public static void main（String [] args）{



A a =新A（）;



System.out.println（a）;



}

}

解决方案

编译B时，Java编译器会尝试查找所有关联的类，以便创建可运行的程序。如果它找不到A.class文件，但它可以找到A.java文件，那么它将自动构建该类。尝试运行命令

 java -verbose B.java 

您将看到它的实际效果。

I am completely new to Java and came across a question that how java compiler creates object of one class in another class. For example :

I have class A as below :

class A{}

//I have class B with main method :

    class B{

        public static void main(String[] args){

        A a = new A();
        
        System.out.println(a);
        
    }
}

Here is the question: I wrote class A in one separate txt file and class B in another txt file. When I compile Class B How compiler knows that class A exists since there is no trace of class A in class B. We are not giving path of Class A and we are not not giving any clue that class A exists. But how java compiler knows and create object for Class A in class B. This might be a silly question but it is not letting me to proceed further without an answer. Thanks in advance.

What I have tried:

I have class A as below :

class A{}

I have class B with main method :

class B{

public static void main(String[] args){

A a = new A();

System.out.println(a);

}
}

解决方案

When you compile B then the Java compiler tries to find all associated classes in order to create a runnable program. If it cannot find the A.class file, but it can find the A.java file then it will build the class automatically. Try running the command

java -verbose B.java

and you will see it in action.

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