-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathLEComparator.java
More file actions
67 lines (54 loc) · 1.7 KB
/
LEComparator.java
File metadata and controls
67 lines (54 loc) · 1.7 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
package lambda;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class LEComparator {
public static void main(String[] args) {
List<Person> personList = new ArrayList<>();
personList.add(new Person("John", 20));
personList.add(new Person("Mary", 25));
personList.add(new Person("Peter", 30));
personList.add(new Person("Anna", 28));
personList.add(new Person("Paul", 35));
//without lambda expression
//sort by age
Comparator<Person> comparator =new Comparator<Person>() {
@Override
public int compare(Person o1, Person o2) {
return o1.getAge() - o2.getAge();
}
};
Collections.sort(personList, comparator);
System.out.println("Sort Person List by age in ascending order:");
for (Person person : personList) {
System.out.println(person.getName() + " " + person.getAge());
}
//with lambda expression
Collections.sort(personList, (o1, o2) -> o1.getAge() - o2.getAge());
System.out.println("Sort Person List by age in ascending order:");
personList.forEach(
(person -> System.out.println(person.getName() + " " + person.getAge()))
);
}
}
class Person{
String name;
int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
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;
}
}