項目github位址:bitcarmanlee easy-algorithm-interview-and-practice
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排序是實際中常用的一種需求。具體針對某類對象,也經常需要對對象進行排序。
下面給出一個簡單的例子,使用匿名内部類實作Comparator接口來進行排序。
public class Demo {
public static void TestForSort(List<Person> persons) {
Collections.sort(persons,new Comparator<Person>() {
@Override
public int compare(Person p1,Person p2) {
if(p1.age > p2.age) return 1;
else if (p1.age == p2.age) return 0;
else return -1;
}
});
}
public static void main(String[] args) {
Person p1 = new Person("Jack",18);
Person p2 = new Person("Lucy",20);
Person p3 = new Person("Bruce",19);
Person p4 = new Person("Lili",16);
List<Person> rawList = new ArrayList();
rawList.add(p1);
rawList.add(p2);
rawList.add(p3);
rawList.add(p4);
TestForSort(rawList);
for(Person p:rawList) {
System.out.println(p);
}
}
}
class Person {
String name;
int age;
public Person(String name,int age) {
this.name = name;
this.age = age;
}
@Override
public String toString() {
return name + ":" + age;
}
}
運作上面的代碼:
Lili:16
Jack:18
Bruce:19
Lucy:20