package cn.map;
import java.util.Comparator;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
/**
* TreeMap集合存储自定义对象演示
*
* @author Administrator
*
*/
public class TreeMapDemo {
public static void main(String[] args) {
// 创建TreeMap集合对象，并明确泛型类型，传入按照年龄排序的新的比较器
TreeMap<Seaman, Address> treeMap = new TreeMap<Seaman, Address>(new NewComparatorByAge());
// 调用方法，获取按照年龄排序的船员信息（姓名年龄地址）
getSeamanInformation(treeMap);
}
private static void getSeamanInformation(TreeMap<Seaman, Address> treeMap) {
// 向TreeMap集合中添加键值对
treeMap.put((new Seaman("黎明", 23)), (new Address("山东", "济南", "历下区")));
treeMap.put((new Seaman("李钢", 29)), (new Address("山东", "淄博", "沂源")));
treeMap.put((new Seaman("王磊", 26)), (new Address("山东", "聊城", "茌平")));
treeMap.put((new Seaman("黎明", 21)), (new Address("山东", "济南", "历下区")));
// 获取键值对映射关系的对象的Set集合，并对其进行迭代
Iterator<Map.Entry<Seaman, Address>> it = treeMap.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<Seaman, Address> mapEntry = it.next();
// 获取键
Seaman key = mapEntry.getKey();
// 获取值
Address value = mapEntry.getValue();
System.out.println(key + "" + value);
}
}
}
/*
* 创建比较器，按照年龄进行排序
*/
class NewComparatorByAge implements Comparator<Seaman> {
// 重写compare方法
@Override
public int compare(Seaman o1, Seaman o2) {
int temp = o1.getAge() - o2.getAge();
return temp == 0 ? o1.getName().compareTo(o2.getName()) : temp;
}
}
/*
* 船员类，属性有姓名和年龄
*/
class Seaman {
// 私有化成员变量
private String name;
private int age;
// 构造方法初始化对象
public Seaman(String name, int age) {
super();
this.name = name;
this.age = age;
}
// 重写hashCode方法，为了保证唯一性，如果相同就再重写equals方法
@Override
public int hashCode() {
return name.hashCode() + age * 13;
}
// set get 方法
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
// 重写equals方法
@Override
public boolean equals(Object obj) {
// 判断是不是同一个对象
if (this == obj)
return true;
Seaman stu = (Seaman) obj;
return this.name.equals(stu.name) && this.age == stu.age;
}
// 重写toString方法
@Override
public String toString() {
return "姓名：" + name + " 年龄：" + age;
}
}
/*
* 籍贯类，属性有省份、城市、乡镇
*/
class Address {
// 私有化成员变量：省份、城市、乡镇
private String province;
private String city;
private String village;
// 构造方法初始化对象
public Address(String province, String city, String village) {
super();
this.province = province;
this.city = city;
this.village = village;
}
// 重写toString方法
@Override
public String toString() {
return " 籍贯： " + province + "省" + city + "市" + village + "县";
}
}
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