newstring.java

NewString.java

public class NewString {
	String s;
	NewString(){
		s=null;
	}
	NewString(String s){
		this.s=s;
	}
	public String replace(String newstr,String oldstr){ //replace oldstr with newstr
		return s.replaceAll(oldstr,newstr);
	}
	public String toString(){
		return s;
	}
	public static void main(String args[]){
		String s="abcdefabcdefab";
		System.out.println(s.replaceAll("ab","mn"));
		NewString ns=new NewString("abcdabcdabcd");
		ns.replace("mn","ab");
		System.out.println(ns.replace("mn","ab"));
	}
}