java对象排序

java 对象排序，也是根据对象某个属性进行排序   例如：苹果对象排序，以大小为根据

import java.lang.reflect.Array;import java.util.*;/** * Created by Bright on 2017/7/2. */public class compareTest {    public static void main(String[] args) {        List<Apple> apples = new ArrayList<Apple>();        apples.add(new Apple(2));        apples.add(new Apple(3));        apples.add(new Apple(1));        apples.add(new Apple(5));        Collections.sort(apples, new Apple());        System.out.println(apples);    }}class Apple implements Comparator<Apple>{    private int size;    public int getSize() {        return size;    }    public void setSize(int size) {        this.size = size;    }    public Apple(){    }    public Apple(int size) {        this.size = size;    }    @Override    public int compare(Apple o1, Apple o2) {        return Integer.compare(o1.getSize(),o2.getSize());    }    @Override    public String toString() {        return "Apple{" +                "size=" + size +                '}';    }}排序后输出：

[Apple{size=1}, Apple{size=2}, Apple{size=3}, Apple{size=5}]