集合中按照商品价格排序，按照学生编号排序，Collections集合里的sort方法，Comparator<T>接口，Comparable<T>接口，

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Collections 有一个sort方法，查看API文档

学生类：

public class Product implements Comparable<Product>{private int p_id;private String p_name;private  float price;public Product(int p_id, String p_name, float price) {super();this.p_id = p_id;this.p_name = p_name;this.price = price;}public int compareTo(Product o) {if(this.p_id>o.p_id) return 1;else if(this.p_id<o.p_id) return -1;else return 0;}}

测试类按照学生id排序

public class Product implements Comparable<Product>{private int p_id;private String p_name;private  float price;public Product(int p_id, String p_name, float price) {super();this.p_id = p_id;this.p_name = p_name;this.price = price;}public int compareTo(Product o) {if(this.p_id>o.p_id) return 1;else if(this.p_id<o.p_id) return -1;else return 0;}}

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