String Manipulation (Java)

Code
Joining A String
Reversing A String
Replacing A Character In String
Removing A Character In String

Joining A String:

public static String join(Collection s, String delimiter) {

        StringBuffer buffer = new StringBuffer();

        Iterator iter = s.iterator();

        while (iter.hasNext()) {

            buffer.append(iter.next());

            if (iter.hasNext()) {

                buffer.append(delimiter);

            }

        }

        return buffer.toString();

    }

      //Joining A String

       ArrayList arl = new ArrayList();

       arl.add("i");

       arl.add("am");

       arl.add("muslim");

       System.out.println(join(arl, ":"));

Output:

      i:am:muslim  //every object in Collection is separated by ":"

Reversing A String:

      

       String strTwo = "pakistan";

       StringBuffer str = new StringBuffer(strTwo);

       System.out.println(str.reverse());

Output:  

      

       natsikap

Replacing a character in a String:

       String strTwo = "pakistan";

       String newStr = strTwo.replace('n', 'i');

       System.out.println(newStr);

Output: 

  

       pakistai //instead of pakistan

Removing a character in a String:

       String value = "i am dangerous";

       int pos = value.length()-5; //minus 5 because to reach "e" and remove it

       String newValue  = value.substring(0,pos) + value.substring(pos+1);

       System.out.println(newValue);

Output: 

  

       i am dangrous //because "e" is removed

Determining a character location: 

       String strOne = "hello";

       int index = strOne.indexOf('l');

       System.out.println(index);

Output:  

       2 //starting from "0"