冒泡排序

public class demo {
    public static void main(String[] args) {
        //定义一个数组
        int[] arr = {12, 15, 10, 18, 11};
        System.out.println("排序前" + ArrayToString(arr));

        for (int i = 0; i < arr.length-1; i++) {
            for (int j = 0; j < arr.length-1-i; j++) {
                if (arr[j]>arr[j+1]){
                    int temp=arr[j];
                    arr[j]=arr[j+1];
                    arr[j+1]=temp;
                }
            }
        }
        System.out.println("排序后" + ArrayToString(arr));

    }
    /*数组转String*/
    public static String ArrayToString(int[] arr){
        StringBuilder sb=new StringBuilder();
        sb.append("[");
        for (int i = 0; i < arr.length; i++) {
            if(i==arr.length-1){
                sb.append(arr[i]);
            }else{
                sb.append(arr[i]).append(",");
            }
        }
        sb.append("]");
        String s=sb.toString();
        return s;
    }
}