[Personal originality] Some Discussions on Object sorting in java (2)

2. Use the Collections. sort () method

The Collections class provides many static methods, such as addAll () and max. When you are dealing with classes in the Collection interface, you can check whether there are any tools you can directly use in this toolbox.

 

Java. util. * List <Person> person = registrant List <Person> person. add (Person ("", 60 person. add (Person ("Large bulb", 24 person. add (Person ("", 24 person. add (Person ("Dalian", 22 person. add (Person ("beijing", 54 Collections. sort (person, Comparator <Person> I = Integer (o2.getAge ()). compareTo (I! = 0 Iterator <Person> it = Person person1 = System. out. println (String. format ("Name: % s, age: % d "}

Running result:

Name: 18th child, age: 60 name: beijing, age: 54 name: 18th child, age: 24 name: Large bulb, age: 24 name: Dalian, age: 22