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3 ways to remove duplicates in List
Frequently, we may have an ArrayList which stores many values, and we need to process the ArrayList and get what are the distinct values in the list, or we may want to count occurrence of each value in the ArrayList. We can remove the duplicates in a few ways. Here we propose 3 methods : public static void main(String[] args){ //SuperClass sub=new SubClass(); String[...
Algorithm : Reverse singly linked list
Questions about singly linked list are the lovers of interviewers during interviews given the characteristic that singly linked list is one-directional list and it's difficult to get the previous node of one node without some buffering tricks. In this post, we will demonstrate one of the most frequently asked question about singly linked list -- Reversing the singly list. Given the first node of a singly linked list, reverse the singly linked list. For example : A->B->C->D After ...
Algorithm : Delete middle node from singly linked list
Questions about singly linked list are frequently asked during technical interviews. Today we will share with you one algorithm question about singly linked list. Here is the problem description. Assuming the only information you are giving is there is a pointer to a middle node of a singly linked list, no other information about the linked list is given. Please delete this node and don't affect the structure of the linked list. Initially you may think this question is easy if you know the hea...
ALGORITHM,C,LINKED LIST 2015-10-30 05:21:25
Java SynchronizedList and Iterator
While reading some material about concurrency, I come up with some writing about using SynchronizedList wrap about normal List to enable synchronization. But one interesting thing is http://docs.oracle.com/javase/7/docs/api/java/util/Collections.html#synchronizedList%28java.util.List%29 It says It is imperative that the user manually synchronize on the returned list when iterating over it: 1 List list = Collections.synchronizedList(new A...
What are your list of must know programming proverbs?
It is in fact a good list of proverbs and here are some of the frequently seen programming proverbs. Keep It Simple Stupid Don’t Repeat Yourself A clever person solves a problem. A wise person avoids it – Einstein Silence is construed as approval ( Picked from Kevin blog ) There is no smoke without fire Think first, Program later Never assume the computer assumes anything Don't trust anything from the user input Do you have any favorite of the programming proverbs? ...
PROGRAMMING,TIPS 2011-07-01 07:00:56
Permutation implementation in Java
Permutation is a very basic and important mathematic concept we learned in school. It has very practical applications in real world. For example, in football. In simple, permutation describes all possible ways of doing something. For example, there are six permutations of the set {1,2,3}, namely: (1,2,3), (1,3,2), (2,1,3), (2,3,1), (3,1,2), and (3,2,1). In general, for n items, there are n! number of permutations to arrange these items. How can we implement this algorithm in programming programm...
Permutation,Implementation,Java,Sample 2015-03-26 02:18:14
A Python assignment trap
Python has no assignment, it only has reference. Assume, we have following code snippet: >>> values = [0, 1, 2] >>> values[1] = values >>> values [0, [...], 2] Why the result is not [0, [0, 1, 2], 2], instead it goes into an infinite loop? To understand this, we need to understand some basics about Python. Python has no variables, it only has labels. When we run: values = [0, 1, 2] Python will first create a list object [0,1,2], then it labels it as values. If we later...
Python,Assignment,Trap,Shallow copy 2013-07-19 22:08:36
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Ways to make elements in HTML center aligned horizontally
In our daily HTML design, it is an easy job to horizontally center align an element with known width. <div class="element">I am<a href="http://www.aiubug.com" target="_blank" rel="external" title=""> bug </a>ï¼</div> .element{width:960px;margin:0 auto;} The above codes set the width of the div block and horizontally center align it. It's very easy to implement. However, if we have some elements we don;t know their width and we still want to...
HTML,CSS,Center align,Unknown width 2012-07-11 12:55:00
What's on your Learning List?
How do you track and decide what topics you want to spend time learning? For a while, I didn’t have a real good solution. Something would trigger me to remember “Oh yeah! I really wanted to learn more about thatâ€. I would spend the evening doing busy learning - it seemed like I was learning but I really wasn’t. Instead of trying to do Deliberate Practice, I’d fool myself into thinking I was investing my time wisely by reading blog posts and examples but no...
Learning list,Conscious,Study,Programming 2011-12-05 12:44:39
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