新建日期类，并利用冒泡排序、选择排序、二分法寻找指定日期

    public class TestDateSort{
        public static void main(String[] args){
            Date[] date=new Date[5];
            date[0]=new Date(2006,5,4);
            date[1]=new Date(2006,7,4);
            date[2]=new Date(2008,5,4);
            date[3]=new Date(2004, 5, 9);
            date[4]=new Date(2004, 5, 4);
            Date d=new Date(2006,7,4);
            //bubbleDateSort(date);
            selectionDateSort(date);
            for(int i=0;i<date.length;i++){
                System.out.println(date[i]);
                }
        System.out.println(binaryDate(date,d));
            }
        public static void bubbleDateSort(Date[] date){
            for(int i=0;i<date.length-1;i++){
                for(int j=0;j<date.length-1;j++){
                    if((date[j].compare(date[j+1])>0)){
                        Date d=null;
                        d=date[j];
                        date[j]=date[j+1];
                        date[j+1]=d;
                        }
                    }
                }
            }
        public static void selectionDateSort(Date[] date){
            for(int i=0;i<date.length-1;i++){
                for(int j=i+1;j<date.length;j++){
                    if(date[i].compare(date[j])>0){
                        Date d=null;
                        d=date[i];
                        date[i]=date[j];
                        date[j]=d;
                        }
                    }
                }
            }
        public static void insertDateSort(Date[] date){
            
            }
        public static int binaryDate(Date[] date,Date d){
            int startPos=0;
            int endPos=date.length-1;
            int m=(startPos+endPos)/2;
            while((date[startPos].compare(date[endPos]))<0){
                if((date[m].compare(d))==0) return m;
                if((date[m].compare(d))>0){
                    endPos=m-1;
                    m=(startPos+endPos)/2;
                    }
                if((date[m].compare(d))<0){
                    startPos=m+1;
                    m=(startPos+endPos)/2;
                    }
                }
            return -1;
            }
        }
    class Date{
        private int year;
        private int month;
        private int date;
        public Date(int year,int month,int date){
            this.year=year;
            this.month=month;
            this.date=date;
            }
        public String toString(){
            return "year-month-date:"+year+"-"+month+"-"+date;
            }
        public int compare(Date d){
            if(this.year<d.year){
                return -1;
            }else if(this.year>d.year){
                return 1;
            }else{
                if(this.month<d.month){return -1;}else if(this.month>d.month){
                    return 1;
                }else{
                    if(this.date<d.date){return -1;}else if(this.date>d.date){
                        return 1;
                    }else{
                        return 0;
                        }
                    }
                }
            }
        
        }