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package com.citycollege.stw;
public class testreplace {
 
 
 public static final String replace( String line, String oldString, String newString )
    {
        if (line == null)
   {
    return null;
            }
        int i=0;
        if ( ( i=line.indexOf( oldString, i ) ) >= 0 )
   {
    char [] line2 = line.toCharArray(); //×Ö·û´®·ÅÈëÊý×é
    char [] newString2 = newString.toCharArray(); //ÒªÌæ»»µÄ×Ö·û´®
    int oLength = oldString.length();  //±»Ìæ»»µÄ×Ö·û´®µÄ³¤¶È
    StringBuffer buf = new StringBuffer(line2.length);
    buf.append(line2, 0, i).append(newString2);
    i += oLength;
    int j = i;
    while( ( i=line.indexOf( oldString, i ) ) > 0 )
     {
      buf.append(line2, j, i-j).append(newString2);
      i += oLength;
      j = i;
                    }
    buf.append(line2, j, line2.length - j);
    return buf.toString();
   }
   return line;
    }     
 
 
 
 
  public static void main(String args[]){
         String s="I OK OK best OK" +
           "She OK OK BESTU OK";
         String s1=replace(s,"OK","hello");
          System.out.println(s1);
   


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