1. package java.lang;
    3. public class Object {
    5.     private static native void registerNatives();
    7.     static {
    8.         registerNatives();
    9.     }
    11.     public final native Class<?> getClass();
    13.     public native int hashCode();
    16.     public boolean equals(Object obj) {
    17.         return (this == obj);
    18.     }
    20.     protected native Object clone() throws CloneNotSupportedException;
    22.     public String toString() {
    23.         return getClass().getName() + "@" + Integer.toHexString(hashCode());
    24.     }
    26.     public final native void notify();
    28.     public final native void notifyAll();
    30.     public final native void wait(long timeout) throws InterruptedException;
    33.     public final void wait(long timeout, int nanos) throws InterruptedException {
    34.         if (timeout < 0) {
    35.             throw new IllegalArgumentException("timeout value is negative");
    36.         }
    38.         if (nanos < 0 || nanos > 999999) {
    39.             throw new IllegalArgumentException(
    40.                                 "nanosecond timeout value out of range");
    41.         }
    43.         if (nanos > 0) {
    44.             timeout++;
    45.         }
    47.         wait(timeout);
    48.     }
    50.     public final void wait() throws InterruptedException {
    51.         wait(0);
    52.     }
    54.     protected void finalize() throws Throwable { }