A class is a blueprint which you use to create objects. An object is an instance of a class - it's a concrete 'thing' that you made using a specific class. So, 'object' and 'instance' are the same thing, but the …

Jun 20, 2014 · The Java documentation for Class says: Class objects are constructed automatically by the Java Virtual Machine as classes are loaded and by calls to the defineClass method in the class …

Feb 10, 2012 · A Class is like an object constructor or a "blueprint" for creating objects. A reference is an address that indicates where an object's variables and methods are stored.

Dec 17, 2019 · The java.lang.instrument.Instrumentation class provides a nice way to get the size of a Java Object, but it requires you to define a premain and run your program with a java agent.

Apr 25, 2012 · It can also be used to convert a JSON string to an equivalent Java object. Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.

If class B and class C extend class A and I have an object of type B or C, how can I determine of which type it is an instance?

Mar 19, 2015 · 2f92e0f4 the hashcode of the object. The name of array classes look a little different, which is explained well in the Javadocs for Class.getName(). For instance, [Ljava.lang.String means: …

The instanceof keyword, as described by the other answers, is usually what you would want. Keep in mind that instanceof will return true for superclasses as well. If you want to see if an object is a direct …

If you want to deep copy an object you will have to traverse the object graph and copy each child object explicitly via the object's copy constructor or a static factory method that in turn deep copies the child …

Apr 3, 2013 · -1 Alternatively, you can also use cjson library for converting java object to json string - maven