Convert roman numerals to decimal in java

Read a roman number and convert that into decimal. For such a problem we have to find a suitable solution. we need to write a method to read the Roman number and a converter. there is a  common patterns in Roman numbers and find a solution to convert.
For example , " III "means 1+1+1=3 , " V " means 5 " IV " means 4 how ?
let see , First read string and check from back to front .so now we have first " V " and " I " .now check last character is grater other one then " - " operator else " + "operator   ( if V > I then 5 - 1 = 4 )

Sparse Matrix Operations in Java

In the subfield of numerical analysis, a sparse matrix is a matrix populated primarily with zeros (Stoer & Bulirsch 2002, p. 619) as elements of the table. By contrast, if a larger number of elements differ from zero, then it is common to refer to the matrix as a dense matrix. The fraction of zero elements (non-zero elements) in a matrix is called the sparsity (density).

Basic Queue program in java

The program features a Queue class with insert(), remove(), peek(), isFull(), isEmpty(), and size() methods. The main() program creates a queue of five cells, inserts four items, removes three items, and inserts four more. The sixth insertion invokes the wraparound feature. All the items are then removed and displayed.

Find all anagrams of a word in Java

Finding an algorithm to answer this question may seem challenging because finding all the different permutations of a string is something that you just do naturally without really thinking about it. But, try to figure out what algorithm you are implicitly using in your mind whenever you write down all the different permutations of a string. Let’s use the word “dogs” as an example and see what different permutations we get. Here is what comes up when we list out all the possible permutations of the letters in “dogs”: 

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