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Q:
java clone() optimization
when i called clone() function of Object type (including String and boolean type), does it mean that all the objects that stored inside Object is copied?
Or only the reference to the object is copied?
I understand that Object is the "class" type, that means, it means for primitive types, only their primitive value is copied?
e.g:
String str = "test";
String str2 = (String) str.clone();
or
Integer i = 2;
Integer i2 = (Integer) i.clone();
or
Boolean b = true;
Boolean b2 = (Boolean) b.clone();
are they are equivalent?
A:
I understand that Object is the "class" type, that means, it means for primitive types, only their primitive value is copied?
You got it wrong. It means that the method uses an Object to copy the value. (You can't copy primitive values directly, the target must be an Object)
e.g: String str = "test";
This is not a primitive type, but a String. To do a deep copy you need to use the clone method.
String str2 = (String) str.clone();
The result is a String, not a String instance. Strings are immutable, and when you do a clone you copy the reference (which is not the same as the reference's value). You have two String objects (one for the source and one for the result).
Integer i = 2;
Integer i2 = (Integer) i.clone();
The result is a Integer, and not an Integer instance. You have two Integer objects (one for