What is the difference between == and equals() in Java?

What is the difference between == and equals() in Java?

java identity equality object-comparison

java

The JPA hashCode() / equals() dilemma

java hibernate jpa identity eclipselink

java

How to get the unique ID of an object which overrides hashCode()?

java identity hashcode

java

How does Hibernate detect dirty state of an entity object?

java hibernate orm entity-relationship identity

java

Does Java guarantee that Object.getClass() == Object.getClass()?

java class jvm identity equality

java