TreeMap的使用
import java.util.Comparator;
import java.util.Set;
import java.util.TreeMap;
/*
*TreeMap<Student,String>
* 键:Student
* 值：String
*/
public class TreeMapDemo3 {
publicstatic void main(String[] args) {
//创建集合对象
TreeMap<Student,String> tm = new TreeMap<Student, String>(
newComparator<Student>() {
@Override
publicint compare(Student s1, Student s2) {
//主要条件
intnum = s1.getAge() - s2.getAge();
//次要条件
intnum2 = num == 0 ? s1.getName().compareTo(
s2.getName()): num;
returnnum2;
}
});
//创建学生对象
Students1 = new Student("潘安", 30);
Students2 = new Student("柳下惠", 35);
Students3 = new Student("唐伯虎", 33);
Students4 = new Student("燕青", 32);
Students5 = new Student("唐伯虎", 33);
//存储元素
tm.put(s1,"宋朝");
tm.put(s2,"元朝");
tm.put(s3,"明朝");
tm.put(s4,"清朝");
tm.put(s5,"汉朝");
//遍历
Set<Student>set = tm.keySet();
for(Student key : set) {
Stringvalue = tm.get(key);
System.out.println(key.getName()+ "---" + key.getAge() + "---"
+value);
}
}
}
运行结果：
潘安---30---宋朝
燕青---32---清朝
唐伯虎---33---汉朝
柳下惠---35---元朝