* further action is taken until the Java virtual machine has again * determined that there is no longer any means by which this object can * be accessed by any thread that has not yet died, including possible * actions by other objects or classes which are ready to be finalized, * at ...
而提到hashCode方法就不得不提 Java 中的Map接口下的相关容器了,因为Map接口下的一些容器(HashMap,IdentityHashMap)正是通过对象的hashCode方法进行工作的,在HashMap中,会有一个名为table的数组字段,这个数组字段用来储存HashMap中每一个键值对关系,即为映射表,每当储存一个新的键值对进入当前的HashMap对象的时候,都...
*@seejava.lang.Thread*/publicfinalnativevoidnotify();/*** Causes all threads which are waiting on this object's monitor (by means * of calling one of the {@codewait()} methods) to be woken up. The threads * will not run immediately. The thread that called {@codenotify()} has to ...
* The offset is merely used as a means to access a particular field * in the other methods of this class. The value is unique to the given * field and the same value should be returned on each subsequent call. * 返回指定静态field的内存地址偏移量,在这个类的其他方法中这个值只是被用作一...
java.lang.ClassCastException: com.baeldung.casting.Dogcannot be cast tocom.baeldung.casting.Cat This means that we are trying to convert an object that is an instance ofDoginto aCatinstance. ClassCastExceptionis always thrown at runtime if the type we downcast to doesn’t match the type of ...
orreadUnsharedmay return aClassobject or enum constant obtainable elsewhere in the stream or through external means. If the deserialized object defines areadResolvemethod and the invocation of that method returns an array, thenreadUnsharedreturns a shallow clone of that array; this guarantees that ...
always guarantee that the reference returned by readUnshared is unique; the deserialized object may define a readResolve method which returns an object visible to other parties, or readUnshared may return a Class object or enum constant obtainable elsewhere in the stream or through external means....
After the finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or...
Setting this reference to null means it’s no longer pointing to the “Dec 25, 1999” object. (So would setting christmas to any other value.) Unless that object is referenced by another variable, it’s now inaccessible and can be garbage-collected. A few more notes: constructors can’t...
In Java, methods may – accept zero or more arguments return void or a single value be overloaded – means we can define more than one method with the same name but different syntax be overridden – means we can define methods with the same syntax in parent and child classes ...