treesetusedemo.java

JAVA编程思想源代码 值得一下 很难找的

package chapter9;

import java.util.Comparator;
import java.util.Iterator;
import java.util.TreeSet;

public class TreeSetUseDemo {

	public static void main(String[] args) throws Exception {
		TreeSet ts = new TreeSet();
		for (int i = 5; i >= 0; i--) {
			ts.add(new Integer(i));
		}
		TreeSet anotherts = (TreeSet) ts.clone();
		Iterator it = anotherts.iterator();
		System.out.println("TreeSet:Clone方法实例");
		while (it.hasNext()) {
			System.out.println(it.next());
		}
		System.out.println("TreeSet:comparator构造方法实例");
		TreeSet s = new TreeSet(new MyComparator());
		s.add("aa");
		s.add("cc");
		s.add("dd");
		s.add("bb");
		Iterator its = s.iterator();
		while (its.hasNext()) {
			System.out.println(its.next());
		}

		System.out.println("TreeSet:fist &last方法实例");
		System.out.println("first is :" + s.first());
		System.out.println("last is :" + s.last());

	}

}

class MyComparator implements Comparator {
	public int compare(Object s1, Object s2) {
		String str1 = (String) s1;
		String str2 = (String) s2;
		return str1.compareTo(str2);
	}
}