java使用冒泡排序引用类型的数组

本是古典何须时尚 2022-04-06 09:22 206阅读 0赞

# java使用冒泡排序引用类型的数组 #

TestDateSort.java

//对日期进行排序
    public class TestDateSort {
    	public static void main(String[] args) {
    		//引用类型数组
    		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);
    		
    		
    		//冒泡排序
    		bubbleSort(days);
    		
    		for(int i=0; i<days.length; i++) {
    			//打印对象的引用，相当与直接调用toString(),需要重写toString()
    			System.out.println(days[i]);
    		}
    		
    	}
    	
    	//冒泡排序
    	public static Date[] bubbleSort(Date[] a){
            int len = a.length;
    		//从底往上
            for(int i = len-1;i>=1;i--){
    			//数组序号从小到大
                for(int j = 0;j<=i-1;j++){
    				//比较日期大小
                    if(a[j].compare(a[j+1]) > 0){
    					//下标值没变，指向的对象改变了
                        Date temp = a[j]; 
                        a[j]=a[j+1];
                        a[j+1]=temp;
                    }
                }
            }
            return a;
        }
        
    }
    
    //定义日期类
    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
    	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()
    	public String toString() {
    		return "Year:Month:Day -- " + year + "-" + month + "-" + day;
    	}
    }

F:\java>javac TestDateSort.java
    
    F:\java>java TestDateSort
    Year:Month:Day -- 2004-5-4
    Year:Month:Day -- 2004-5-9
    Year:Month:Day -- 2006-5-4
    Year:Month:Day -- 2006-7-4
    Year:Month:Day -- 2008-5-4
    
    F:\java>