import java.util.TreeMap;public class TreeMap1 {public static void main(String[] args) {//TreeMap<String,Integer> tm = new TreeMap<>((a,b)->b.compareTo(a));  字母降序//TreeMap<String,Integer> tm = new TreeMap<>(); key 字符串自然排序升序TreeMap<String,Integer> tm = new TreeMap<>((a,b)->b.compareTo(a));tm.put("java",500);tm.put("c",400);tm.put("go",200);tm.put("php",290);tm.put("python",390);tm.put("javascript",420);System.out.println(tm);System.out.println(tm.keySet());System.out.println(tm.values());//tm.keySet()//tm.values()//tm.entrySet()//Integer 降序var t = new TreeMap<Integer,String>((a, b)->b-a);t.put(16,"李四");t.put(200,"赵六");t.put(10,"张三丰");t.put(13,"李勇");System.out.println(t);}
}