Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| JavaTM 2 Platform Standard Ed. 5.0
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## java.lang
Class Compiler

    java.lang.Object
      java.lang.Compiler

    public final class Compiler

extends Object

The `Compiler` class is provided to support Java-to-native-code compilers and related services. By design, the `Compiler` class does nothing; it serves as a placeholder for a JIT compiler implementation.

When the Java Virtual Machine first starts, it determines if the system property `java.compiler` exists. (System properties are accessible through `getProperty` and , a method defined by the `System` class.) If so, it is assumed to be the name of a library (with a platform-dependent exact location and type); the `loadLibrary` method in class `System` is called to load that library. If this loading succeeds, the function named `java_lang_Compiler_start()` in that library is called.

If no compiler is available, these methods do nothing.

Since:
  JDK1.0
See Also:
  `System.getProperty(java.lang.String)`, `System.getProperty(java.lang.String, java.lang.String)`, `System.loadLibrary(java.lang.String)`

Method Summary
`static Object` | `command(Object any)` Examines the argument type and its fields and perform some documented operation.
`static boolean` | `compileClass(Class<?> clazz)` Compiles the specified class.
`static boolean` | `compileClasses(String string)` Compiles all classes whose name matches the specified string.
`static void` | `disable()` Cause the Compiler to cease operation.
`static void` | `enable()` Cause the Compiler to resume operation.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### compileClass

    public static boolean compileClass(Class<?> clazz)

  Compiles the specified class.

  Parameters:
    `clazz` - a class.
  Returns:
    `true` if the compilation succeeded; `false` if the compilation failed or no compiler is available.
  Throws:
    `NullPointerException` - if `clazz` is `null`.

### compileClasses

    public static boolean compileClasses(String string)

  Compiles all classes whose name matches the specified string.

  Parameters:
    `string` - the name of the classes to compile.
  Returns:
    `true` if the compilation succeeded; `false` if the compilation failed or no compiler is available.
  Throws:
    `NullPointerException` - if `string` is `null`.

### command

    public static Object command(Object any)

  Examines the argument type and its fields and perform some documented operation. No specific operations are required.

  Parameters:
    `any` - an argument.
  Returns:
    a compiler-specific value, or `null` if no compiler is available.
  Throws:
    `NullPointerException` - if `any` is `null`.

### enable

    public static void enable()

  Cause the Compiler to resume operation.

### disable

    public static void disable()

  Cause the Compiler to cease operation.

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| JavaTM 2 Platform Standard Ed. 5.0
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.