problem on strings

in string1 "123456 ABC DEF...",IN string2 "raveen". iwant to add string2 after 123456 in the first string based on index number.i need logic for this with out using StringBuffer concept. Thanks in advanace

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September 21, 2011 at 1:15 PM

import java.awt.*;
import javax.swing.*;

class Header{
    public static void main(String []args){
      String st1="123456 ABC DEF";
      int index=st1.indexOf(' ');
      String substring1=st1.substring(0,index+1);
      String substring2=st1.substring(index+1);
      String st2="raveen"+" ";
      String st3=substring1.concat(st2).concat(substring2);
      JFrame f=new JFrame(st3);
      f.setLayout(null);
      JLabel l=new JLabel(st3);
      l.setBounds(50,10,300,20);
      f.add(l);
      f.setSize(300,100);
      f.setVisible(true);
    }
}

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