Class java.lang.Compiler - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.lang.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.

See Also:: getProperty, getProperty, loadLibrary

command(Object): Examines the argument type and its fields and perform some documented operation.
compileClass(Class): Compiles the specified class.
compileClasses(String): Compiles all classes whose name matches the specified string.
disable(): Cause the Compiler to cease operation.
enable(): Cause the Compiler to resume operation.

compileClass

 public static native 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.

compileClasses

 public static native 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.

command

 public static native 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.

enable

 public static native void enable()

Cause the Compiler to resume operation.

disable

 public static native void disable()

Cause the Compiler to cease operation.

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