What is the difference between shallow copy and deep copy?

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Shallow copy shares the same reference with the original object like cloning, whereas the deep copy get a duplicate instance of the original object. If the shallow copy has been changed, the original object will be reflected and vice versa.

2012-08-24, 2497👍, 0💬

Can you declare a class as private?
Can you declare a class as private? Yes, we can declare a private class as an inner class. For example, class MyPrivate { private static class MyKey { String key = "12345"; } public static void main(String[] args) { System.out.println(new MyKey().key);//prints 12345 } } 2012-08-23, 2726👍, 0💬

What is the output of x &gt y? a:b = p*q when x=1,y=2,p=3,q=4?
What is the output of x &gt y? a:b = p*q when x=1,y=2,p=3,q=4? When this kind of question has been asked, find the problems you think is necessary to ask back before you give an answer. Ask if variables a and b have been declared or initialized. If the answer is yes. You can say that the syntax ... 2012-08-21, 2598👍, 0💬

Why Java does not support pointers?
Why Java does not support pointers? Because pointers are unsafe. Java uses reference types to hide pointers and programmers feel easier to deal with reference types without pointers. This is why Java and C-sharp shine. 2012-08-22, 2550👍, 0💬

Why is multiple inheritance not possible in Java?
Why is multiple inheritance not possible in Java? It depends on how you understand "inheritance". Java can only "extends" one super class, but can "implements" many interfaces; that doesn't mean the multiple inheritance is not possible. You may use interfaces to make inheritance work for you. Or you... 2012-08-27, 2540👍, 0💬

Parsers? DOM vs SAX parser
Parsers? DOM vs SAX parser Parsers are fundamental xml components, a bridge between XML documents and applications that process that XML. The parser is responsible for handling xml syntax, checking the contents of the document against constraints established in a DTD or Schema. DOM 1. Tree of nodes ... 2012-08-23, 2507👍, 0💬

What is the difference between shallow copy and deep copy?
What is the difference between shallow copy and deep copy? Shallow copy shares the same reference with the original object like cloning, whereas the deep copy get a duplicate instance of the original object. If the shallow copy has been changed, the original object will be reflected and vice versa. 2012-08-24, 2498👍, 0💬

What's the difference between constructors and other methods?
What's the difference between constructors and other methods? Constructors must have the same name as the class and can not return a value. They are only called once while regular methods could be called many times. 2012-08-27, 2491👍, 0💬

This class (IncrementImpl) will be used by various threads concurrently; can you see the inherent flaw(s)? How would you improve
This class (IncrementImpl) will be used by various threads concurrently; can you see the inherent flaw(s)? How would you improve it? public class IncrementImpl { private static int counter = 0; public synchronized void increment() { counter++; } public int getCounter() { return counter; } } The coun... 2012-08-28, 2451👍, 0💬

Can one create a method which gets a String and modifies it?
Can one create a method which gets a String and modifies it? No. In Java, Strings are constant or immutable; their values cannot be changed after they are created, but they can be shared. Once you change a string, you actually create a new object. For example: String s = "abc"; //create a new String... 2012-08-24, 2409👍, 0💬

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