J2SE 8的Lambda --- Comparator

		Person[] personArray = new Person[]{new Person("Tom"),new Person("Jack"),new Person("Alice")};
		
		//1. 使用静态的比较器,比较的对象不能为null值
		Arrays.sort(personArray, Comparator.comparing(Person::getName));
		for (Person person : personArray) {
			System.out.println(person.getName());
		}
		System.out.println();
		
		//2. 使用andThen,在第一层比较相同的情况下，使用andThen的比较器，  多次比较
		personArray = new Person[]{new Person("Tom","A","Tom" ),new Person("Tom","B","Tom" ),new Person("Jack"),new Person("Alice")};
		Arrays.sort(personArray, Comparator.comparing(Person::getName).thenComparing(Person::getFirstName).thenComparing(Person::getLastName));
		for (Person person : personArray) {
			System.out.println(person.getName()+"-"+person.getFirstName()+"-"+person.getLastName());
		}
		System.out.println();
		
		//3. 变体格式,指定具体比较的内容
		personArray = new Person[]{new Person("Tom"),new Person("Jack"),new Person("Alice")};
		Arrays.sort(personArray, Comparator.comparing(Person::getName, (x,y)->Integer.compare(x.length(), y.length())));
		for (Person person : personArray) {
			System.out.println(person.getName());
		}
		System.out.println();
		
		//4.对于可能返回null的情况,使用nullsFirst和nullsLast适配器
		personArray = new Person[]{new Person("Tom"),new Person("Jack"),new Person("Alice"),new Person()};
		Arrays.sort(personArray, Comparator.comparing(Person::getName, Comparator.nullsFirst(Comparator.naturalOrder())));
		for (Person person : personArray) {
			System.out.println(person.getName());
		}
		System.out.println();
		
		//5. 逆序比较 Comparator.comparing().reversed()
		personArray = new Person[]{new Person("Tom"),new Person("Jack"),new Person("Alice"),new Person()};
		Arrays.sort(personArray, Comparator.comparing(Person::getName, Comparator.nullsFirst(Comparator.naturalOrder())).reversed());
		for (Person person : personArray) {
			System.out.println(person.getName());
		}
		System.out.println();