java数组排序

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定义数组可以这样，比如int a[] = new int[10];

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import java.util.Arrays;
import java.util.Comparator;
class Dog{
    int size;    
    public Dog(int s){
        size = s;
    }
}

class DogSizeComparator implements Comparator<Dog>{
    @Override
    public int compare(Dog o1, Dog o2) {
        return o1.size - o2.size;
    }
}    

public class ArraySort {

    public static void main(String[] args) {
        Dog d1 = new Dog(2);
        Dog d2 = new Dog(1);
        Dog d3 = new Dog(3);

        Dog[] dogArray = {d1, d2, d3};
        printDogs(dogArray);

        Arrays.sort(dogArray, new DogSizeComparator());    
        printDogs(dogArray);
    }

    public static void printDogs(Dog[] dogs){
        for(Dog d: dogs)
            System.out.print(d.size + " " );

        System.out.println();
    }
}