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ComparatorEx.java
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71 lines (52 loc) · 1.57 KB
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package com.zetcode;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
class Person {
private String name;
private int age;
public String getName() {
return name;
}
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public void setName(String name) {
this.name = name;
}
public void setAge(int age) {
this.age = age;
}
public int getAge() {
return this.age;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("Person{");
sb.append("name='").append(name).append('\'');
sb.append(", age=").append(age);
sb.append('}');
return sb.toString();
}
}
// Comparator compares its two arguments for order. Returns a negative integer,
// zero, or a positive integer as the first argument is less than, equal
// to, or greater than the second.
public class ComparatorEx {
public static void main(String[] args) {
var p1 = new Person("Robert", 23);
var p2 = new Person("Monika", 18);
var p3 = new Person("Tom", 37);
var p4 = new Person("Elisabeth", 31);
List<Person> persons = Arrays.asList(p1, p2, p3, p4);
// persons.sort(Comparator.comparingInt(Person::getAge));
persons.sort(new Comparator<Person>() {
@Override
public int compare(Person p1, Person p2) {
return p1.getAge() - p2.getAge();
}
});
persons.forEach(System.out::println);
}
}