java怎麽對樹形結構進行遍歷

java">import java.util.Iterator;

import java.util.Random;

import java.util.TreeSet;

public class Demo{

public static void main(String[] args) throws Exception {

TreeSet<Integer> ts = new TreeSet<Integer>();

for(int i = 0; i < 10; i++){

ts.add(new Random().nextInt(999));

}

for(Iterator<Integer> it = ts.iterator(); it.hasNext();){

System.out.println(it.next());

}

}

}