JavaCompiler未正确编译文件

Question

我正在努力习惯JavaCompiler并尝试用它编译程序，我可以成功地编译由单个文件组成的程序，但当我尝试用多个文件编译项目时。在编译实现其他类的文件时，以及在该类使用已实现类中的方法时，我会遇到错误。

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()+"nn");
        }
    }
    try {
        stdFileManager.close();//Close the file manager
    } catch (IOException e) {
        e.printStackTrace();
    }
    return compile;
}

以下是我试图编译的一个类的示例

    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);
   }
}

有人知道这里出了什么问题吗？为什么我的代码找不到实现的类，即使它和实现它的类在同一个文件夹中？

是因为程序包不在程序的顶部吗？

EDIT：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

C:projectsCompilerCompilerJar Filesjsyntaxpane-0.9.5-b29.jar;
C:projectsCompilerCompilerJar Filesjtar-1.1.jar;
C:projectsCompilerCompilerJar Filessqlitejdbc-v056.jar;
C:Program FilesNetBeans 7.1.2javamodulesextbeansbinding-1.2.1.jar;
C:Program FilesNetBeans 7.1.2javamodulesextAbsoluteLayout.jar;
C:projectsCompilerCompilerJar Filesjunit-4.11-SNAPSHOT-20120416-1530.jar;
C:projectsCompilerCompilerJar Filescommons-io-2.4-bin.zip;
C:projectsCompilerCompilerJar Filescommons-io-2.4commons-io-2.4.jar;
C:projectsCompilerCompilerJar Filespoi-3.8poi-3.8-20120326.jar;
C:projectsCompilerCompilerJar Filesjavamail-1.4.5mail.jar;
C:projectsCompilerCompilerbuildclasses

Answer 1

很可能，这与编译器无关。我的猜测是，这是因为源文件中的一个错误。您是否记得导入适当的类和接口？

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。