ListDemo2.java
-----------------
package com.fs.test; import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List; /*
* Collections可以针对ArrayList存储基本包装类的元素排序,存储自定义对象可不可以排序呢?
*/
public class Listdemo2 {
public static void main(String[] args) {
// 创建集合对象
List<Person2> list = new ArrayList<Person2>(); Person2 s1 = new Person2("Bobby",18);
Person2 s2 = new Person2("Mike",20);
Person2 s3 = new Person2("Jim",35);
Person2 s4 = new Person2("Zoe",27);
Person2 s5 = new Person2("Dave",18);
Person2 s6 = new Person2("Madison",35);
Person2 s7 = new Person2("Caden",40);
Person2 s8 = new Person2("Ava",23);
Person2 s9 = new Person2("Noah",25);
Person2 s10 = new Person2("Isabella",27);
Person2 s11 = new Person2("Lucas",25); // 添加元素对象
list.add(s1);
list.add(s2);
list.add(s3);
list.add(s4);
list.add(s5);
list.add(s6);
list.add(s7);
list.add(s8);
list.add(s9);
list.add(s10);
list.add(s11); // 排序
// 自然排序
// Collections.sort(list);
// 比较器排序
// 如果同时有自然排序和比较器排序,以比较器排序为主
Collections.sort(list, new Comparator<Person2>() {
@Override
public int compare(Person2 s1, Person2 s2) {
if(s1.getAge()-(s2.getAge())!=0){
return s1.getAge()-(s2.getAge());
}else{
return s1.getName().compareTo(s2.getName());
}
}
}); // 遍历集合
for (Person2 s : list) {
System.out.println(s.getName() + "---" + s.getAge());
}
}
} Person2,java
-------------------package com.fs.test; public class Person2 {
private String name;
private int age; public Person2() {
super();
} public Person2(String name, int age) {
super();
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;
}
}