java集合---hashcode和equals的重写

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package lianxi;public class Weather {   int data;   String  temperature;   int speed;public Weather(int data, String temperature, int speed) {super();this.data = data;this.temperature = temperature;this.speed = speed;<pre name="code" class="java">package lianxi;import java.util.HashSet;public class HashDemo4 {public static void main(String[] args) {HashSet<Weather> hs = new HashSet<Weather>();hs.add(new Weather(1, "20", 30));hs.add(new Weather(3, "50", 80));hs.add(new Weather(5, "60", 10));hs.add(new Weather(7, "70", 40));hs.add(new Weather(1, "50", 60));System.out.println(hs);for (Weather weather : hs) {if(weather.getSpeed()<4){System.out.println(weather);//输出风速小于4的}}}}

package lianxi;import java.util.HashSet;public class HashDemo4 {public static void main(String[] args) {HashSet<Weather> hs = new HashSet<Weather>();hs.add(new Weather(1, "20", 30));hs.add(new Weather(3, "50", 80));hs.add(new Weather(5, "60", 10));hs.add(new Weather(7, "70", 40));hs.add(new Weather(1, "50", 60));System.out.println(hs);for (Weather weather : hs) {if(weather.getSpeed()<4){System.out.println(weather);//输出风速小于4的}}}}

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