TreeMap的最基本用法

import java.util.Map.Entry;

import java.util.Set;

import java.util.TreeMap;

public class TreeMapDemo1 {

public static void main(String[] args) {

TreeMap<String, String >treeMap=new TreeMap<String ,String >();

treeMap.put("jack", "zhangsan");

treeMap.put("mary", "xiaoming");

treeMap.put("rose", "xiaohong");//小红被小华替换

treeMap.put("free", "xiaogang");

treeMap.put("rose", "xiaohua");

System.out.println(treeMap);

//输出时按照键的顺序输出

Set<Entry<String, String>>temp=treeMap.entrySet();

for (Entry<String, String> entry : temp) { 
System.out.println(entry.getKey()+">>>"+entry.getValue());

}
}

}