Java Module java.compiler Package javax.tools Interface FileObject（JDK11）

139 阅读 0 评论 0 点赞

All Known Subinterfaces:

JavaFileObject

All Known Implementing Classes:

ForwardingFileObject, ForwardingJavaFileObject, SimpleJavaFileObject
```
public interface FileObject
```
File abstraction for tools. In this context, file means an abstraction of regular files and other sources of data. For example, a file object can be used to represent regular files, memory cache, or data in databases.
All methods in this interface might throw a SecurityException if a security exception occurs.

Unless explicitly allowed, all methods in this interface might throw a NullPointerException if given a null argument.

Since:

1.6

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`delete()`	Deletes this file object.
`CharSequence`	`getCharContent(boolean ignoreEncodingErrors)`	Returns the character content of this file object, if available.
`long`	`getLastModified()`	Returns the time this file object was last modified.
`String`	`getName()`	Returns a user-friendly name for this file object.
`InputStream`	`openInputStream()`	Returns an InputStream for this file object.
`OutputStream`	`openOutputStream()`	Returns an OutputStream for this file object.
`Reader`	`openReader(boolean ignoreEncodingErrors)`	Returns a reader for this object.
`Writer`	`openWriter()`	Returns a Writer for this file object.
`URI`	`toUri()`	Returns a URI identifying this file object.

- Method Detail
  - toUri
```
URI toUri()
```
    Returns a URI identifying this file object.
    
    Returns:
    
    a URI
  - getName
```
String getName()
```
    Returns a user-friendly name for this file object. The exact value returned is not specified but implementations should take care to preserve names as given by the user. For example, if the user writes the filename "BobsApp\Test.java" on the command line, this method should return "BobsApp\Test.java" whereas the toUri method might return file:///C:/Documents%20and%20Settings/UncleBob/BobsApp/Test.java.
    
    Returns:
    
    a user-friendly name
  - openInputStream
```
InputStream openInputStream()
                     throws IOException
```
    Returns an InputStream for this file object.
    
    Returns:
    
    an InputStream
    
    Throws:
    
    IllegalStateException - if this file object was opened for writing and does not support reading
    
    UnsupportedOperationException - if this kind of file object does not support byte access
    
    IOException - if an I/O error occurred
  - openOutputStream
```
OutputStream openOutputStream()
                       throws IOException
```
    Returns an OutputStream for this file object.
    
    Returns:
    
    an OutputStream
    
    Throws:
    
    IllegalStateException - if this file object was opened for reading and does not support writing
    
    UnsupportedOperationException - if this kind of file object does not support byte access
    
    IOException - if an I/O error occurred
  - openReader
```
Reader openReader(boolean ignoreEncodingErrors)
           throws IOException
```
    Returns a reader for this object. The returned reader will replace bytes that cannot be decoded with the default translation character. In addition, the reader may report a diagnostic unless ignoreEncodingErrors is true.
    
    Parameters:
    
    ignoreEncodingErrors - ignore encoding errors if true
    
    Returns:
    
    a Reader
    
    Throws:
    
    IllegalStateException - if this file object was opened for writing and does not support reading
    
    UnsupportedOperationException - if this kind of file object does not support character access
    
    IOException - if an I/O error occurred
  - getCharContent
```
CharSequence getCharContent(boolean ignoreEncodingErrors)
                     throws IOException
```
    Returns the character content of this file object, if available. Any byte that cannot be decoded will be replaced by the default translation character. In addition, a diagnostic may be reported unless ignoreEncodingErrors is true.
    
    Parameters:
    
    ignoreEncodingErrors - ignore encoding errors if true
    
    Returns:
    
    a CharSequence if available; null otherwise
    
    Throws:
    
    IllegalStateException - if this file object was opened for writing and does not support reading
    
    UnsupportedOperationException - if this kind of file object does not support character access
    
    IOException - if an I/O error occurred
  - openWriter
```
Writer openWriter()
           throws IOException
```
    Returns a Writer for this file object.
    
    Returns:
    
    a Writer
    
    Throws:
    
    IllegalStateException - if this file object was opened for reading and does not support writing
    
    UnsupportedOperationException - if this kind of file object does not support character access
    
    IOException - if an I/O error occurred
  - getLastModified
```
long getLastModified()
```
    Returns the time this file object was last modified. The time is measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970).
    
    Returns:
    
    the time this file object was last modified; or 0 if the file object does not exist, if an I/O error occurred, or if the operation is not supported
  - delete
```
boolean delete()
```
    Deletes this file object. In case of errors, returns false.
    
    Returns:
    
    true if and only if this file object is successfully deleted; false otherwise

Java Module java.compiler Package javax.tools Interface FileObject（JDK11）

Interface FileObject

Method Summary

Method Detail

toUri

getName

openInputStream

openOutputStream

openReader

getCharContent

openWriter

getLastModified

delete