| java Programming Glossary: object.hashcodeHow does the JVM ensure that System.identityHashCode() will never change? http://stackoverflow.com/questions/1063068/how-does-the-jvm-ensure-that-system-identityhashcode-will-never-change  will never change  Typically the default implementation of Object.hashCode is some function of the allocated address of the object in memory.. 
 What is an “internal address” in Java? http://stackoverflow.com/questions/13860194/what-is-an-internal-address-in-java  &ldquo internal address&rdquo in Java  In the Javadoc for Object.hashCode it states As much as is reasonably practical the hashCode method.. is clearly implementation specific. Below I include the Object.hashCode implementation used in OpenJDK 7. The function supports six.. is done outside this function. In summary the notion that Object.hashCode is based on the object's address is largely a historic artefact.. 
 Java, Object.hashCode() result constant across all JVMs/Systems? http://stackoverflow.com/questions/1516843/java-object-hashcode-result-constant-across-all-jvms-systems  Object.hashCode result constant across all JVMs Systems  Is the output of Object.hashCode.. result constant across all JVMs Systems  Is the output of Object.hashCode required to be the same on all JVM implementations for the same.. 
 Where to find source code for java.lang native methods? http://stackoverflow.com/questions/2292629/where-to-find-source-code-for-java-lang-native-methods  the directory structure a little. Some methods such as Object.hashCode may be implemented by hotspot instead or in addition to through.. 
 Iteration order of HashSet http://stackoverflow.com/questions/2704597/iteration-order-of-hashset  added to a java.util.HashSet implements Object.equals and Object.hashCode in a deterministic fashion is the iteration order over the HashSet.. 
 Why hashCode() can return the same value for different objects in java? http://stackoverflow.com/questions/4360035/why-hashcode-can-return-the-same-value-for-different-objects-in-java  instance again and again . Because hash codes from Java's Object.hashCode are of type int you can only have 2^32 different values. That's.. 
 How do hashCode() and identityHashCode() work at the back end? http://stackoverflow.com/questions/4930781/how-do-hashcode-and-identityhashcode-work-at-the-back-end  hashCode and identityHashCode work at the back end  How do Object.hashCode and System.identityHashCode work at the back end Does identityHashCode.. 
 The JPA hashCode() / equals() dilemma http://stackoverflow.com/questions/5031614/the-jpa-hashcode-equals-dilemma  options Do not override them rely on Object.equals and Object.hashCode hashCode equals work cannot identify identical objects problems.. 
 Consistency of hashCode() on a Java string http://stackoverflow.com/questions/785091/consistency-of-hashcode-on-a-java-string  so please keep the answer focused to String.hashCode . Object.hashCode is totally irrelevant in the context of this question.  java.. 
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