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我正在尝试习惯 JavaCompiler 并尝试使用它编译程序,我可以成功编译包含单个文件的程序,但是当我尝试编译具有多个文件的项目时。我在编译实现其他类的文件以及该类在何处使用已实现类中的方法时遇到错误。

这是我用来编译java代码的代码

private final String  directoryForBin = "C:/TempBINfolder/bin";

public List doCompilation(String sourceCode, String locationOfFile) {
   List<String> compile = new ArrayList<>();

    SimpleJavaFileObject fileObject = new DynamicJavaSourceCodeObject(locationOfFile, sourceCode);
    JavaFileObject javaFileObjects[] = new JavaFileObject[]{fileObject};

    JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

    StandardJavaFileManager stdFileManager = compiler.getStandardFileManager(null, Locale.getDefault(), null);

    Iterable<? extends JavaFileObject> compilationUnits = Arrays.asList(javaFileObjects);

    // creates a Temp BIN foler on the C: drive to add .class files for compiling      
    new File(directoryForBin).mkdirs();

    String[] compileOptions = new String[]{"-d", directoryForBin, "-classpath", System.getProperty("java.class.path")};
    Iterable<String> compilationOptions = Arrays.asList(compileOptions);

    DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();

    CompilationTask compilerTask = compiler.getTask(null, stdFileManager, diagnostics, compilationOptions, null, compilationUnits);

    boolean status = compilerTask.call();

    if (!status) {//If compilation error occurs 
        // Iterate through each compilation problem and print it
        for (Diagnostic diagnostic : diagnostics.getDiagnostics()) { 
            compile.add(diagnostic.getKind().toString()+" on line  "+ diagnostic.getLineNumber() +"\nIn file:  \n"+ diagnostic.toString()+"\n\n");
        }
    }
    try {
        stdFileManager.close();//Close the file manager
    } catch (IOException e) {
        e.printStackTrace();
    }

    return compile;
}

这是我正在尝试编译的类之一的示例

    public class IntegerComparator 
             implements Comparator<Integer>
{
   public IntegerComparator(){}

   public int compare(Integer a, Integer b)
   {  int aValue = a.intValue();
      int bValue = b.intValue();
      return (aValue - bValue);
   }

}

有谁知道这里出了什么问题以及为什么我的代码没有找到实现的类,即使它与实现它的类在同一个文件夹中?

是不是因为包不在程序的顶部?

编辑:这是上述示例的输出错误

ERROR on line  8
In file:  
/projects/Compiler/Studentfilestotest/LAB3/aroc1/a3/IntegerComparator.java:8: error: cannot find symbol
             implements Comparator<Integer>
                        ^
  symbol: class Comparator

这就是System.getProperty("java.class.path")返回的内容

C:\projects\Compiler\Compiler\Jar Files\jsyntaxpane-0.9.5-b29.jar;
C:\projects\Compiler\Compiler\Jar Files\jtar-1.1.jar;
C:\projects\Compiler\Compiler\Jar Files\sqlitejdbc-v056.jar;
C:\Program Files\NetBeans 7.1.2\java\modules\ext\beansbinding-1.2.1.jar;
C:\Program Files\NetBeans 7.1.2\java\modules\ext\AbsoluteLayout.jar;
C:\projects\Compiler\Compiler\Jar Files\junit-4.11-SNAPSHOT-20120416-1530.jar;
C:\projects\Compiler\Compiler\Jar Files\commons-io-2.4-bin.zip;
C:\projects\Compiler\Compiler\Jar Files\commons-io-2.4\commons-io-2.4.jar;
C:\projects\Compiler\Compiler\Jar Files\poi-3.8\poi-3.8-20120326.jar;
C:\projects\Compiler\Compiler\Jar Files\javamail-1.4.5\mail.jar;
C:\projects\Compiler\Compiler\build\classes
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1 回答 1

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很可能,这与编译器无关。我的猜测是这是因为源文件中的错误。你记得导入适当的类和接口吗?

您的IntegerComparator.java文件需要包含导入:

import java.util.Comparator; // <--- Import!

public class IntegerComparator 
      implements Comparator<Integer>{

   public IntegerComparator(){}

   public int compare(Integer a, Integer b){
      int aValue = a.intValue();
      int bValue = b.intValue();
      return (aValue - bValue);
   }
}

忘记导入适当的类通常会导致“找不到符号”错误消息。

于 2012-09-10T12:30:22.267 回答