public class Bubble {
    /*
       对数组a中的元素进行排序
    */
    public static void sort(Comparable[] a){
        for(int i=a.length-1;i>0;i--){
            for(int j=0;j<i;j++){
                //{6,5,4,3,2,1}
                //比较索引j和索引j+1处的值
                if (greater(a[j],a[j+1])){
                    exch(a,j,j+1);
                }
            }
        }
    }

    /*
        比较v元素是否大于w元素
     */
    private static  boolean greater(Comparable v,Comparable w){
        return v.compareTo(w)>0;
    }

    /*
    数组元素i和j交换位置
     */
    private static void exch(Comparable[] a,int i,int j){
        Comparable temp;
        temp = a[i];
        a[i]=a[j];
        a[j]=temp;
    }
    public static void bubbleSort(int[] data) {

        int arrayLength = data.length;

        for (int i = 1; i < arrayLength; i++) {//第i次排序

            for (int j = 0; j < arrayLength - i; j++) {//从索引为j的数开始
                if (data[j] > data[j + 1]) { //相邻元素两两对比
                    int temp = data[j + 1];  // 元素交换
                    data[j + 1] = data[j];
                    data[j] = temp;
                }
            }

            System.out.println("第" + i + "次排序：\n" + java.util.Arrays.toString(data));
        }
    }

    public static void main(String[] args) {

        int[] data = {3, 44, 38, 5, 47, 15, 36, 26, 27, 2, 46, 4, 19, 50, 48};

        System.out.println("排序之前：\n" + java.util.Arrays.toString(data));

        bubbleSort(data);

        System.out.println("排序之后：\n" + java.util.Arrays.toString(data));
    }

}