答：import java.util.*;

class test

{

public static void main(String[] args)

{

String str1="001,002,003,004,006",str2 = "001,002,005";

String str="";

TreeSet ts = new TreeSet();

StringTokenizer st = new StringTokenizer(str1,",");

while (st.hasMoreTokens())

{

ts.add(st.nextToken());

}

st = new StringTokenizer(str2,",");

while (st.hasMoreTokens())

{

ts.add(st.nextToken());

}

Iterator it = ts.iterator();

while(it.hasNext())

str=str+it.next()+",";

System.out.println(str);

}

}