By Peter Sestoft
C# is an object-oriented programming language that's just like the Java programming language in lots of respects yet extra entire and diverse in such a lot information. This publication supplies a concise description of C#. it's meant as a advisor for readers who recognize Java and wish to benefit C# and as a brief reference for a person who desires to understand C# in additional aspect than that supplied by means of a typical textbook. the ultimate bankruptcy of C# accurately summarizes the variations among C# and Java.C# accurately is without doubt one of the first books on C# to hide model 2.0. It provides the total C# 2.0 programming language, together with generics, iterators, and nameless equipment. It excludes many of the vast Microsoft.NET framework classification libraries other than threads, input/output, and standard assortment periods. The publication indicates normal principles on left-hand pages, with corresponding examples on right-hand pages. All examples are fragments of criminal C# courses. the entire, ready-to-run instance courses are to be had on the book's website.
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Returns sb. 2. Length of type int is the length of sb, that is, the number of characters currently in sb. • sb[i] is character number i in the string builder, counting from zero. Thus sb[i] = c sets the character at index i to c. Length. (i+n-1) from the string builder, reducing its length by n characters. Length. Returns sb. ToString()) into the string builder, starting at position i, extending sb as needed. Returns sb. Length. ToString() of type String is a new string containing the characters currently in sb.
Using s1 + s2 one can append s1 and s2, but that creates a new string object by copying all the characters from s1 and s2; there is no way to extend s1 itself by appending more characters to it. Thus to concatenate n strings each of length k by repeated string concatenation (+), we must copy k + 2k + 3k + · · · + nk = kn(n + 1)/2 characters, and the time required to do this is proportional to n2 , which grows rapidly as n grows. Using a string builder, the concatenation of n strings each of length k requires only time proportional to n, considerably faster than n2 for large n.
The static method GetPoint returns the i’th APoint in the arraylist. The class is used in example 81. Beware that every APoint created will be reachable from allpoints. This prevents automatic recycling (garbage collection) of APoint objects at run-time; objects should not be kept live in this way unless there is a very good reason to do so. 2 Class Modifiers abstract, sealed, static If a class C is declared abstract, then it cannot be instantiated, but non-abstract subclasses of C can be instantiated.