终于弄好了

public static void main(String[] args) {
        int[] arr={1,2,3,5,6,8,9,10,11,11,12,13,14,15};
       
        for(int i=0;i<arr.length-1;i++){
            //0 1 2 3 4 5 6 7
            int temp=arr[i]+1;
            //2 3 4 5 6 7
            System.out.print(arr[i]+",");
   
            if(temp!=arr[i+1]){
                System.out.println();
            }
        }
        System.out.println(arr[arr.length-1]);
           
    }

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