package com.atguigu.java;
public class Goods implements Comparable{
private String name;
private double price;
public Goods() {
}
public Goods(String name, double price) {
this.name = name;
this.price = price;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
@Override
public String toString() {
return "Goods{" +
"name='" + name + '\'' +
", price=" + price +
'}';
}
@Override
public int compareTo(Object o) {
if(o instanceof Goods){
Goods goods = (Goods)o;
if(this.price > goods.price){
return 1;
}else if(this.price < goods.price){
return -1;
}else{
return -this.name.compareTo(goods.name);
}
}
throw new RuntimeException("传入的数据类型不一致!");
}
}
package com.atguigu.java;
import org.junit.Test;
import java.util.Arrays;
import java.util.Comparator;
public class CompareTest {
@Test
public void test1(){
String[] arr = new String[]{"AA","CC","KK","MM","GG","JJ","DD"};
Arrays.sort(arr);
System.out.println(Arrays.toString(arr));
}
@Test
public void test2(){
Goods[] arr = new Goods[5];
arr[0] = new Goods("lenovoMouse",34);
arr[1] = new Goods("dellMouse",43);
arr[2] = new Goods("xiaomiMouse",12);
arr[3] = new Goods("huaweiMouse",65);
arr[4] = new Goods("microsoftMouse",43);
Arrays.sort(arr);
System.out.println(Arrays.toString(arr));
}
@Test
public void test3(){
String[] arr = new String[]{"AA","CC","KK","MM","GG","JJ","DD"};
Arrays.sort(arr,new Comparator(){
@Override
public int compare(Object o1, Object o2) {
if(o1 instanceof String && o2 instanceof String){
String s1 = (String) o1;
String s2 = (String) o2;
return -s1.compareTo(s2);
}
throw new RuntimeException("输入的数据类型不一致");
}
});
System.out.println(Arrays.toString(arr));
}
@Test
public void test4(){
Goods[] arr = new Goods[6];
arr[0] = new Goods("lenovoMouse",34);
arr[1] = new Goods("dellMouse",43);
arr[2] = new Goods("xiaomiMouse",12);
arr[3] = new Goods("huaweiMouse",65);
arr[4] = new Goods("huaweiMouse",224);
arr[5] = new Goods("microsoftMouse",43);
Arrays.sort(arr, new Comparator() {
@Override
public int compare(Object o1, Object o2) {
if(o1 instanceof Goods && o2 instanceof Goods){
Goods g1 = (Goods)o1;
Goods g2 = (Goods)o2;
if(g1.getName().equals(g2.getName())){
return -Double.compare(g1.getPrice(),g2.getPrice());
}else{
return g1.getName().compareTo(g2.getName());
}
}
throw new RuntimeException("输入的数据类型不一致");
}
});
System.out.println(Arrays.toString(arr));
}
}