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Thread: Finding out number of Palindromes in a Sentence

  1. #1
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    Question Finding out number of Palindromes in a Sentence

    I have tried to do a program to find number of palindromes in a sentence but couldn't complete it since I doesn't know to reverse the string and also to remove special characters. Please help!

    My code:
    import java.io.*;
    import java.lang.*;
    class palindrome1
    {
    public static void main(String args[])
    {
    System.out.println("Welcome");
    getsentence();
    }
     
     
    public static void getsentence()
    {
    try
    {
    String sent=" ";
    String s1=" ";
    String[] punct={".",",","?","!"};
    String input=" ";
    String[] temp;
    String[] temp1={ } ;
    String[] revstrng;
    int i=0;
    String delimiter=" ";
    int len=0;
     
    System.out.println("Enter the Sentence to find Palindrome Count:");
     
    BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
    sent=in.readLine();
    s1=sent.toLowerCase();
    System.out.println("The entered sentence is:" + s1);
     
    temp=s1.split(delimiter);
    for(int j=0;i<temp.length;i++)
    {
    System.out.println(temp[i]);
     
    if(temp1[i]==(temp[i].reverse()))
     
    {
    i++;
    }
    System.out.println("Number of Palindromes in Sentence:" + i);
    }
     
     
     
    }
    catch(Exception e)
    {
    System.out.println(e.getMessage());
    }
     
     
    }
     
    }
    Last edited by copeg; September 12th, 2010 at 10:19 PM. Reason: Code tags


  2. #2
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    Default Re: Finding out number of Palindromes in a Sentence

    Ok, well for removing "special characters" you need to first figure out what "special characters" are. Then you could use the String.replace(char,char) method to "remove" them.

    For reversing the word, you can convert the String to a char[] by using the method String.toCharArray(), then rebuild the String by going through the array in reverse.

    Have a look at the String API: String (Java Platform SE 6)

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