利用冒泡排序对日期进行排序

灰太狼 2022-05-11 00:08 280阅读 0赞

package jave;
    
    /*日期排序*/
    public class DataSort {
    	
    	public static void main(String[] args) {
    		Date[] days = new Date[5];
    		days[0] = new Date(2006, 5, 4);
    		days[1] = new Date(2006, 7, 4);
    		days[2] = new Date(2008, 5, 4);
    		days[3] = new Date(2004, 5, 9);
    		days[4] = new Date(2004, 5, 4);
    		
    		bubblesort(days);
    		for(int i = 0; i < days.length; i++) {
    			System.out.println(days[i]);//将数组里的内容转换成toString输出
    		}
    		
    	}
    	
    	
    //对日期进行冒泡排序
    	public static Date[] bubblesort(Date[] a) { //返回类型为数组类型
    		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;	
    	}
    	
    	
    	public static class Date {
    			int year, month, day;
    			Date(int y, int m, int d){
    				year = y;
    				month = m;
    				day = d;
    			}
    			
    //比较日期大小,先看年份，年份大就返回1，否则返回-1，如果年份相等,再比较月份,以此类推
    			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;
    			}
    			
    //重写toString方法
    			public String toString() {
    				return "Year:Month:Day -- " + year + "-" + month + "-" + day;
    			}		
    		}
    	
    }

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