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Thread: Sequences (convert char[] to String) [Replacing String with Character]

  1. #1
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    Default Sequences (convert char[] to String) [Replacing String with Character]

    I am quite a beginner at programming.. was given an assignment and don't understand how to complete the rest of it. I have tried for hours and hours and can't figure it out. I would greatly appreciate the assistance as to I have no clue what I am doing.

    Write a program in Java that stores the following sequence that is comprised of only 'A','C','G', & 'T' characters: [ATGACATCTCTCCATACG]. The program should store the sequence both as a String and as a char[].

    The program should accept two inputs from the user: -A single character with the only allowable values are either 'A','C','G', or 'T', and -An integer value that is greater than 0 and smaller than the length of the sequence.

    Your program should then produce the following as output: -It prints a total count of the occurrences of the single character provided as input.

    -It identifies the locations where the character entered by the user appears in the sequence at a location that is greater than or equal to the integer value provided as input by the user

    -It generates a new list with the character entered by the user replaced by an asterisk ['*'] according to the previous requirement.

    -Your program should provide two sets of methods to implement this functionality: one set dealing with the sequence as a char[] and the other set of methods dealing with the sentence as an instance of String.

    -Your program should do the necessary checking on the values provided for the character and integer inputs to prevent the values provided by the user from getting your program to malfunction.

    -You should provide as output test cases of your program for a user input corresponding to each of the four letters, naely: 'A','C','G', & 'T', and for two integer values: 0 and 4 - for a total of eight test cases.

    __________________________________________________ __________________________________________________ _______
    This is what I have so far, let me know what I need to do! THANKS!!

    package Java;
    import static Java.CountEachLetter.countLetters;
    import java.util.regex.*;
    import java.util.*;
    import java.util.Scanner;
    public class Sequence {
    public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    // Prompt the user to enter a string
    System.out.print("Enter a string: ");
    String s = input.nextLine();
    // Counts each letter to Lower Case
    int[] counts = countLetters(s.toLowerCase());
    // Display results
    for (int i = 0; i < counts.length; i++) {
    if (counts[i] != 0)
    System.out.println((char)('A' + i) + " appears " +
    counts[i] + ((counts[i] == 1) ? " time" : " times"));
    // String result = input.replace("*", "asterisk");
    String seq = input.nextLine();
    Pattern p = Pattern.compile(""); //"C*A*" //"C*A+"
    Matcher m = p.matcher(seq);
    // boolean res = m.matches();
    // System.out.println("matching CCC " + res);
    //replace all ACC with _?
    p = Pattern.compile("AC+A");
    m = p.matcher(seq);
    // System.out.println("replacing all AC+C with _");

  2. #2
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    Default Re: Sequences (convert char[] to String) [Replacing String with Character]

    When asking a question like this, it helps if you also provide (as well as the description you included and your code):
    1. A sample input you have tried
    2. The current output from your sample
    3. The expected output for your sample

    When asking for help, please follow these guidelines to receive better and more prompt help:
    1. Put your code in Java Tags. To do this, put [highlight=java] before your code and [/highlight] after your code.
    2. Give full details of errors and provide us with as much information about the situation as possible.
    3. Give us an example of what the output should look like when done correctly.

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  3. #3
    Junior Member
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    Default Re: Sequences (convert char[] to String) [Replacing String with Character]

    Okay will try and upload output screenshots later on. About to go to work for tonight.

    The output so far just prints the number of times 'A', 'C', 'G', & 'T' is inputted by the user...
    I need it for the sequence.

  4. #4
    Administrator copeg's Avatar
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    Default Re: Sequences (convert char[] to String) [Replacing String with Character]

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  5. The Following User Says Thank You to copeg For This Useful Post:

    GregBrannon (September 25th, 2013)

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