数组合并排序与List（Collection）合并排序数组合并排序与List（Collectio

数组合并：直接使用common-lang中的jar包
pom.xml配置

org.apache.commons commons-lang3 3.7

基本数据类型的排序不必重写compareTo方法

package ArrayDemo; import org.apache.commons.lang3.ArrayUtils; import java.util.Arrays; public class ArrayMerge {public static void main(String[] args) {int i_first[] = {1,3,3,7}; int i_second[] = {2,7,9}; int contact[] = ArrayUtils.addAll(i_first, i_second); Arrays.sort(contact); for (int i:contact) { System.out.println(i + " "); }} }

package ListDemo; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; public class ListMerge {public static void main(String[] args) { List【数组合并排序与List（Collection）合并排序】 list_first = new ArrayList<>(); List list_second = new ArrayList<>(); List list_final = new ArrayList<>(); Person p_one = new Person("Sandy",17); Person p_two = new Person("Monica",20); Person p_three = new Person("Coco", 16); Person p_four = new Person("Ivy", 18); list_first.add(p_one); list_first.add(p_two); list_second.add(p_three); list_second.add(p_four); list_final.addAll(list_first); list_final.addAll(list_second); /* * Object 排序一 */ Object[] obj = list_final.toArray(); Arrays.sort(obj); for (Object o:obj) { System.out.println(((Person)o).getAge() +" "); }/* * Object 排序二 * 调用原理：Collections类 ——> List的sort方法 ——> List的sort方法中调用toArray()——>调用数组的sort方法Array.sort() * ——> 调用compareTo()方法 */ //Collections.sort(list_final); //for (Person person : list_final) { //System.out.println( person.getAge() +" "); //}}public static class Person implements Comparable{ private static final long serialVersionUID = 8656128222714547171L; transient private String name; private int age; Person(String name,int age){ this.name= name; this.age=age; }public int getAge() { return age; }public String getName() { return name; }public void setAge(int age) { this.age = age; }public void setName(String name) { this.name = name; }@Override public int compareTo(Person o) { return (this.age < o.getAge()) ? -1 : ((this.age == o.getAge()) ? 0 : 1); } }}