this code is in java. Consider a program which can evaluate strings of DNA code. DNA code is a String containing only the letters “C”, “T”, “G” or “A”. Write a method countPattern, that will take in a DNA sequence dna of any length as well as a pattern pattern, and return an int counting the number of times that pattern appears in the dna String. An example, given the dna: “ACACTGACGT” and the pattern: “AC” countPattern(dna, pattern) would return 3.

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.