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src/java.base/share/classes/java/lang/System.java

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  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang;
  26 
  27 import java.io.BufferedInputStream;
  28 import java.io.BufferedOutputStream;
  29 import java.io.Console;
  30 import java.io.FileDescriptor;
  31 import java.io.FileInputStream;
  32 import java.io.FileOutputStream;
  33 import java.io.IOException;
  34 import java.io.InputStream;
  35 import java.io.OutputStream;
  36 import java.io.PrintStream;
  37 import java.lang.annotation.Annotation;
  38 import java.lang.foreign.MemorySegment;
  39 import java.lang.invoke.MethodHandle;
  40 import java.lang.invoke.MethodType;
  41 import java.lang.module.ModuleDescriptor;

  42 import java.lang.reflect.Executable;
  43 import java.lang.reflect.Method;
  44 import java.net.URI;
  45 import java.nio.channels.Channel;
  46 import java.nio.channels.spi.SelectorProvider;
  47 import java.nio.charset.CharacterCodingException;
  48 import java.nio.charset.Charset;
  49 import java.security.ProtectionDomain;
  50 import java.util.List;
  51 import java.util.Locale;
  52 import java.util.Map;
  53 import java.util.Objects;
  54 import java.util.Properties;
  55 import java.util.ResourceBundle;
  56 import java.util.Set;
  57 import java.util.concurrent.Executor;
  58 import java.util.concurrent.ScheduledExecutorService;
  59 import java.util.function.Supplier;
  60 import java.util.concurrent.ConcurrentHashMap;
  61 import java.util.stream.Stream;

 470      * @throws     IndexOutOfBoundsException  if copying would cause
 471      *             access of data outside array bounds.
 472      * @throws     ArrayStoreException  if an element in the {@code src}
 473      *             array could not be stored into the {@code dest} array
 474      *             because of a type mismatch.
 475      * @throws     NullPointerException if either {@code src} or
 476      *             {@code dest} is {@code null}.
 477      */
 478     @IntrinsicCandidate
 479     public static native void arraycopy(Object src,  int  srcPos,
 480                                         Object dest, int destPos,
 481                                         int length);
 482 
 483     /**
 484      * Returns the same hash code for the given object as
 485      * would be returned by the default method hashCode(),
 486      * whether or not the given object's class overrides
 487      * hashCode().
 488      * The hash code for the null reference is zero.
 489      *















 490      * @param x object for which the hashCode is to be calculated
 491      * @return  the hashCode
 492      * @since   1.1
 493      * @see Object#hashCode
 494      * @see java.util.Objects#hashCode(Object)
 495      */
 496     @IntrinsicCandidate
 497     public static native int identityHashCode(Object x);
 498 
 499     /**
 500      * System properties.
 501      *
 502      * See {@linkplain #getProperties getProperties} for details.
 503      */
 504     private static Properties props;
 505 
 506     /**
 507      * Determines the current system properties.
 508      * <p>
 509      * The current set of system properties for use by the

2297             }
2298 
2299             public void unparkVirtualThread(Thread thread) {
2300                 if (thread instanceof BaseVirtualThread vthread) {
2301                     vthread.unpark();
2302                 } else {
2303                     throw new WrongThreadException();
2304                 }
2305             }
2306 
2307             public Executor virtualThreadDefaultScheduler() {
2308                 return VirtualThread.defaultScheduler();
2309             }
2310 
2311             public StackWalker newStackWalkerInstance(Set<StackWalker.Option> options,
2312                                                       ContinuationScope contScope,
2313                                                       Continuation continuation) {
2314                 return StackWalker.newInstance(options, null, contScope, continuation);
2315             }
2316 




2317             public String getLoaderNameID(ClassLoader loader) {
2318                 return loader != null ? loader.nameAndId() : "null";
2319             }
2320 
2321             @Override
2322             public void copyToSegmentRaw(String string, MemorySegment segment, long offset) {
2323                 string.copyToSegmentRaw(segment, offset);
2324             }
2325 
2326             @Override
2327             public boolean bytesCompatible(String string, Charset charset) {
2328                 return string.bytesCompatible(charset);
2329             }
2330         });
2331     }
2332 }

  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang;
  26 
  27 import java.io.BufferedInputStream;
  28 import java.io.BufferedOutputStream;
  29 import java.io.Console;
  30 import java.io.FileDescriptor;
  31 import java.io.FileInputStream;
  32 import java.io.FileOutputStream;
  33 import java.io.IOException;
  34 import java.io.InputStream;
  35 import java.io.OutputStream;
  36 import java.io.PrintStream;
  37 import java.lang.annotation.Annotation;
  38 import java.lang.foreign.MemorySegment;
  39 import java.lang.invoke.MethodHandle;
  40 import java.lang.invoke.MethodType;
  41 import java.lang.module.ModuleDescriptor;
  42 import java.lang.reflect.ClassFileFormatVersion;
  43 import java.lang.reflect.Executable;
  44 import java.lang.reflect.Method;
  45 import java.net.URI;
  46 import java.nio.channels.Channel;
  47 import java.nio.channels.spi.SelectorProvider;
  48 import java.nio.charset.CharacterCodingException;
  49 import java.nio.charset.Charset;
  50 import java.security.ProtectionDomain;
  51 import java.util.List;
  52 import java.util.Locale;
  53 import java.util.Map;
  54 import java.util.Objects;
  55 import java.util.Properties;
  56 import java.util.ResourceBundle;
  57 import java.util.Set;
  58 import java.util.concurrent.Executor;
  59 import java.util.concurrent.ScheduledExecutorService;
  60 import java.util.function.Supplier;
  61 import java.util.concurrent.ConcurrentHashMap;
  62 import java.util.stream.Stream;

 471      * @throws     IndexOutOfBoundsException  if copying would cause
 472      *             access of data outside array bounds.
 473      * @throws     ArrayStoreException  if an element in the {@code src}
 474      *             array could not be stored into the {@code dest} array
 475      *             because of a type mismatch.
 476      * @throws     NullPointerException if either {@code src} or
 477      *             {@code dest} is {@code null}.
 478      */
 479     @IntrinsicCandidate
 480     public static native void arraycopy(Object src,  int  srcPos,
 481                                         Object dest, int destPos,
 482                                         int length);
 483 
 484     /**
 485      * Returns the same hash code for the given object as
 486      * would be returned by the default method hashCode(),
 487      * whether or not the given object's class overrides
 488      * hashCode().
 489      * The hash code for the null reference is zero.
 490      *
 491      * <div class="preview-block">
 492      *      <div class="preview-comment">
 493      *          The "identity hash code" of a {@linkplain Class#isValue() value object}
 494      *          is computed by combining the identity hash codes of the value object's fields recursively.
 495      *      </div>
 496      * </div>
 497      * @apiNote
 498      * <div class="preview-block">
 499      *      <div class="preview-comment">
 500      *          Note that, like ==, this hash code exposes information about a value object's
 501      *          private fields that might otherwise be hidden by an identity object.
 502      *          Developers should be cautious about storing sensitive secrets in value object fields.
 503      *      </div>
 504      * </div>
 505      *
 506      * @param x object for which the hashCode is to be calculated
 507      * @return  the hashCode
 508      * @since   1.1
 509      * @see Object#hashCode
 510      * @see java.util.Objects#hashCode(Object)
 511      */
 512     @IntrinsicCandidate
 513     public static native int identityHashCode(Object x);
 514 
 515     /**
 516      * System properties.
 517      *
 518      * See {@linkplain #getProperties getProperties} for details.
 519      */
 520     private static Properties props;
 521 
 522     /**
 523      * Determines the current system properties.
 524      * <p>
 525      * The current set of system properties for use by the

2313             }
2314 
2315             public void unparkVirtualThread(Thread thread) {
2316                 if (thread instanceof BaseVirtualThread vthread) {
2317                     vthread.unpark();
2318                 } else {
2319                     throw new WrongThreadException();
2320                 }
2321             }
2322 
2323             public Executor virtualThreadDefaultScheduler() {
2324                 return VirtualThread.defaultScheduler();
2325             }
2326 
2327             public StackWalker newStackWalkerInstance(Set<StackWalker.Option> options,
2328                                                       ContinuationScope contScope,
2329                                                       Continuation continuation) {
2330                 return StackWalker.newInstance(options, null, contScope, continuation);
2331             }
2332 
2333             public int classFileFormatVersion(Class<?> clazz) {
2334                 return clazz.getClassFileVersion();
2335             }
2336 
2337             public String getLoaderNameID(ClassLoader loader) {
2338                 return loader != null ? loader.nameAndId() : "null";
2339             }
2340 
2341             @Override
2342             public void copyToSegmentRaw(String string, MemorySegment segment, long offset) {
2343                 string.copyToSegmentRaw(segment, offset);
2344             }
2345 
2346             @Override
2347             public boolean bytesCompatible(String string, Charset charset) {
2348                 return string.bytesCompatible(charset);
2349             }
2350         });
2351     }
2352 }
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