remove spaces from sentance

//1. Using replaceAll() Method
 
        strWithoutSpace = str.replaceAll(" ", "");
 
        System.out.println(strWithoutSpace);
 
        //2. Without Using replaceAll() Method
 
        char[] strArray = str.toCharArray();
 
        StringBuffer sb = new StringBuffer();
 
        for (i = 0; i < strArray.length; i++)
        {
            if( (strArray[i] != ' ') && (strArray[i] != '\t') )
            {
                sb.append(strArray[i]);
            }
        }