如何在Java中编译.java文件？ [英] How to compile a .java file in Java?

问题描述

我有以下生成的代码（.java文件）。

  import org.eclipse.swt.widgets。贝壳; 
 
 import org.eclipse.swt.widgets.Display; 
 
 public class HelloWorldSWT {
 
 / ** 
 * @param args 
 * / 
 public static void main（String [] args ）{
 // TODO自动生成的方法存根
 
显示display = new Display（）; 
 shell shell = new Shell（display）; 
 shell.setText（Hello world！）; 
 shell.open（）; 
 while（！shell.isDisposed（））{
 if（！display.readAndDispatch（））display.sleep（）; 
} 
 display.dispose（）; 
} 
 
} 
  

现在我想编译上面的文件从命令行。我去了源代码所在的目录，我试过两个命令：

1。 javac HelloWorldSWT.java

2。 javac -d / home / myname / workspace / HelloWorldSWT.java

在这两种情况下，我都遇到了无法解析导入org.eclipse错误。
/ home / myname / workspace / - 是类文件所在的目录。

据我所知，编译器没有看到org。 eclipse.swt包。为什么？

可能是因为有问题的包位于/home/myname/workspace/org.eclipse.swt/（不在/ home / myname / work> 以便Java编译器知道在哪里找到org.eclipse。*类。您可以使用命令行开关或环境变量。

I have the following code generated by Eclipse (.java file).

import org.eclipse.swt.widgets.Shell;

import org.eclipse.swt.widgets.Display;

public class HelloWorldSWT {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Hello world!");
        shell.open();
        while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) display.sleep();
        }
        display.dispose();
    }

}

Now I want to compile the above file from the command line. I went to the directory where the source code is located and I tried two commands:
1. javac HelloWorldSWT.java
2. javac -d /home/myname/workspace/ HelloWorldSWT.java

In both cases I have the same error "The import org.eclipse cannot be resolved". /home/myname/workspace/ - is the directory where the class file is located.

As far as I understand the compiler does not see the org.eclipse.swt package. Why?

Can it be because the problematic package is located in "/home/myname/workspace/org.eclipse.swt/" (not in "/home/myname/workspace/org/eclipse/swt/")?

解决方案

You need to set your classpath so that the Java compiler knows where to find the org.eclipse.* classes. You can do that with a command line switch or an environment variable.

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