import java.util.Comparator;
import java.util.Iterator;
import java.util.TreeSet;
public class TreeSetDemo2 {
public static void main(String[] args) {
TreeSet<String> ts=new TreeSet();
ts.add("a");
ts.add("sfsd");
ts.add("fgdfd");
ts.add("aaa");
ts.add("bcd");
Iterator<String> it=ts.iterator();
while(it.hasNext())
{
System.out.println(it.next());
}
}
}
class StringLengthCompare implements Comparator<Object>
{
public int compare(Object o1,Object o2)
{
String s1=(String) o1;
String s2=(String) o2;
int num=new Integer(s1.length()).compareTo(new Integer(s2.length()));
if(num==0)
return s1.compareTo(s2);
return num;
}
}出現(xiàn)在int num=new Integer(s1.length()).compareTo(new Integer(s2.length()));這一行
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