任意初始化days数组，然后对days元素排序，再用半折查找法查找特定的Date对象day

public class Test {
    public static void main(String args[]) {
        Date[] days = new Date[5];
        days[0] = new Date(2008,4,6);
        days[1] = new Date(2005,5,6);
        days[2] = new Date(2003,6,6);
        days[3] = new Date(2007,7,6);
        days[4] = new Date(2008,8,6);
        
        bubbleSort(days);
        
        for(int i = 0;i < days.length; i++) {
            System.out.println(days[i]);
        }
    }
    
    public static Date[] bubbleSort(Date[] a) {
        int len = a.length;
        for(int i =len-1; i >=1; i--) {
            for(int j = 0; j <= i-1; j++) {
                if(a[j].compare(a[j+1]) > 0) {
                    Date temp = a[j];
                    a[j] = a[j+1];
                    a[j+1] = temp;
                }
            }
        }
        return a;
    }
}

class Date {
    int year; int month; int day;
    
    Date(int y, int m, int d) {
        year = y; month = m; day = d;
    }
    
    public int compare(Date date) {
        return year > date.year ? 1 
                : year < date.year ? - 1
                : month > date.month ? 1
                : month < date.month ? -1
                : day > date.day ? 1
                : day < date.day ? -1 : 0;        
    }
    
    public String toString() {
        return year + "-" + month + "-" + day;
    }
    
}