集合顺序翻转

集合有个工具类Collections，直接调用其静态方法，对集合排序反转：
比如有个集合：
List list =...
反转排序方法：
Collections.reverse(list);

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方法：实现Comparable接口排序package collsort.comparable;
package com.cvicse.sort.comparable;

public class Cat implements Comparable<Cat> {
private int age;
private String name;

public Cat(int age, String name) {
this.age = age;
this.name = name;
}

public int getAge() {
return age;