1. TreeMap對鍵實現了Comparable接口的對象排序

import java.util.TreeMap; import java.util.Map.Entry;/*** TreeMap對鍵實現了Comparable接口的對象排序 */ public class TreeMapComparable {public static void main(String[] args) {TreeMap<Person, Integer> tm = new TreeMap<Person, Integer>();tm.put(new Person("zhangsan", 19), 1005);tm.put(new Person("cuihua", 16), 1000);tm.put(new Person("fanbingbing", 39), 1009);tm.put(new Person("zhaoliying", 29), 1001);for (Entry<Person, Integer> kv : tm.entrySet()) {System.out.println(kv.getKey() + ":" + kv.getValue());}} }class Person implements Comparable<Person>{public String name;public int age;public Person(String name, int age) {this.name = name;this.age = age;}public int compareTo(Person o) {return o.age - age;}public String toString() {return "[name = " + name + " age = " + age + "]";} }

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