一、自然排序:java.lang.Comparable
class Goods implements Comparable {
private String name;
private double price;
@Override
public int compareTo(Object o) {
if(o instanceof Goods) {
Goods other = (Goods) o;
if (this.price > other.price) {
return 1;
} else if (this.price < other.price) {
return -1;
}
return 0;
} throw new RuntimeException("输入的数据类型不一致");
} //构造器、getter、setter、toString()方法略 }
public class ComparableTest{
public static void main(String[] args) { Goods[] all = new Goods[4];
all[0] = new Goods("《红楼梦》", 100);
all[1] = new Goods("《西游记》", 80);
all[2] = new Goods("《三国演义》", 140);
all[3] = new Goods("《水浒传》", 120); Arrays.sort(all); System.out.println(Arrays.toString(all)); } }
二、定制排序:java.util.Comparator
Goods[] all = new Goods[4];
all[0] = new Goods("War and Peace", 100);
all[1] = new Goods("Childhood", 80);
all[2] = new Goods("Scarlet and Black", 140);
all[3] = new Goods("Notre Dame de Paris", 120); Arrays.sort(all, new Comparator() { @Override
public int compare(Object o1, Object o2) {
Goods g1 = (Goods) o1;
Goods g2 = (Goods) o2; return g1.getName().compareTo(g2.getName()); } }); System.out.println(Arrays.toString(all));
原文:https://www.cnblogs.com/xiao-ran/p/12492783.html