List集合排序Demo

import com.google.common.collect.Lists;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;import java.util.*;/*** list order demo*/
public class ListOrderDemo {public static void main(String[] args) {List<String> list = Lists.newArrayList("1","3","2");// convert to arrayString[] array = list.toArray(new String[]{});// [1, 3, 2]System.out.println(Arrays.toString(array));/** order asc **/// [1, 2, 3]list.sort(String::compareTo);System.out.println(list);// [1, 2, 3]list.sort((o1, o2) -> o1.compareTo(o2));System.out.println(list);// [1, 2, 3]list.sort(new Comparator<String>() {@Overridepublic int compare(String o1, String o2) {return o1.compareTo(o2);}});System.out.println(list);/** order desc **/// [3, 2, 1]list.sort(Comparator.reverseOrder());System.out.println(list);// [3, 2, 1]list.sort((o1, o2) -> o2.compareTo(o1));System.out.println(list);// [3, 2, 1]list.sort(new Comparator<String>() {@Overridepublic int compare(String o1, String o2) {return o2.compareTo(o1);}});System.out.println(list);// implements comparableList<Order> orders = new ArrayList<>();orders.add(new Order("4", 1));orders.add(new Order("3", 2));orders.add(new Order("2", 2));orders.add(new Order("1", 3));// [{"age: "1, "name:"4}, {"age: "2, "name:"2}, {"age: "2, "name:"3}, {"age: "3, "name:"1}]orders.sort(Order::compareTo);System.out.println(orders);// [{"age: "1, "name:"4}, {"age: "2, "name:"2}, {"age: "2, "name:"3}, {"age: "3, "name:"1}]orders.sort((o1, o2) -> o1.compareTo(o2));System.out.println(orders);// [{"age: "1, "name:"4}, {"age: "2, "name:"2}, {"age: "2, "name:"3}, {"age: "3, "name:"1}]Collections.sort(orders);System.out.println(orders);}@NoArgsConstructor@AllArgsConstructorpublic static class Order implements Comparable<Order> {private String name;private Integer age;@Overridepublic int compareTo(Order o) {if (Objects.equals(this.age, o.age)) {return this.name.compareTo(o.name);}return this.age.compareTo(o.age);}@Overridepublic String toString() {return "{\"age: \"" + this.age + ", \"name:\"" + this.name + "}";}}
}