javac“找不到符号”命令行出错 [英] javac "cannot find symbol" error with command line

问题描述

我有两个班级Owning和OwningAccessor。这些文件位于同一目录中。

I have two classes Owning and OwningAccessor. The files are in the same directory.

public class Owning {
    String _name = "";
    public void printBanner()
    {
    }
    public void printOwning(double amount)
    {
        printBanner();

        //print details
        System.out.println("name:" + _name);
        System.out.println("amount:" + amount);
    }
}


public class OwningAccessor {
    public void access()
    {
        Owning o = new Owning();
        o.printOwning(500);
    }
}

当我尝试编译拥有 javac -cp的OwningAccessor 。 OwningAccessor.java ，我收到了编译错误。

When I tried to compile OwningAccessor with javac -cp . OwningAccessor.java, I got compilation error.

symbol  : class Owning
location: class smcho.OwningAccessor
        Owning o = new Owning();
        ^
OwningAccessor.java:6: cannot find symbol
symbol  : class Owning
location: class smcho.OwningAccessor
        Owning o = new Owning();
                   ^

这有什么问题？代码在eclipse IDE下编译得很好。

What's wrong with this? The code compiles fine under eclipse IDE.

推荐答案

好的，我们假设你的代码分布在文件中，如下所示

Ok, let's suppose you have the code distributed in files as follows

myproject
├── out
└── src
    ├── OwningAccessor.java
    └── Owning.java

转到命令提示符，将目录更改为 myproject的。一旦发出以下命令：

Go to your command prompt, and change directory to myproject. Once there issue the following command:

javac -d out -sourcepath src src/OwningAccessor.java

我刚试过它，它运作得很好。您编译的类将位于 out 文件夹中：

I just tested it and it works just fine. Your compiled classes will be located in the out folder:

.
├── out
│   ├── OwningAccessor.class
│   └── Owning.class
└── src
    ├── OwningAccessor.java
    └── Owning.java

编译一个类将触发所有其他依赖类的编译。编译器将自动在 src 文件夹中查找它们。

Compiling one class will trigger the compilation of all other dependent classes. The compiler will automatically look for them in the src folder.

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