String Length method in Java

Methods used to obtain information about an object are known as accessor methods. One accessor method that you can use with strings is the length() method, which returns the number of characters contained in the string object. After the following two lines of code have been executed, len equals 17:

String palindrome = "Dot saw I was Tod";

int len = palindrome.length();

A palindrome is a word or sentence that is symmetric—it is spelled the same forward and backward, ignoring case and punctuation. Here is a short and inefficient program to reverse a palindrome string. It invokes the String method charAt(i), which returns the ith character in the string, counting from 0.

String Length Program Screenshot



class StringDemo
{
    public static void main(String[] args)
	{
        String palindrome = "Dot saw I was Tod";
        int len = palindrome.length();
        char[] tempCharArray = new char[len];
        char[] charArray = new char[len];
        
        for (int i = 0; i < len; i++)
			{
            tempCharArray[i] = 
                palindrome.charAt(i);
            } 
        
    
        for (int j = 0; j < len; j++) 
		{
            charArray[j] =
            tempCharArray[len - 1 - j];
        }
        
        String reversePalindrome = new String(charArray);
        System.out.println(reversePalindrome);
    }
}

   

Download Source code of StringDemo program

Running the program produces this output:

doT saw I was toD

String Length Program Output

To accomplish the string reversal, the program had to convert the string to an array of characters (first for loop), reverse the array into a second array (second for loop), and then convert back to a string. The String class includes a method, getChars(), to convert a string, or a portion of a string, into an array of characters so we could replace the first for loop in the program above with

palindrome.getChars(0, len, tempCharArray, 0);

References : Oracle share on :        :  

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