public static void selectSort(int[] data) {  
        int size = data.length;
        int tmp;
        int index;
        for (int i = 0; i < size; i++) {  
            tmp = data[i];
            index = i;
            for(int j = i + 1; j < size; j++){
                if(tmp > data[j]){
                    tmp = data[j];
                    index = j;
                }
            }
            swap(data, i, index);
        }  
    }  
    
    public static void swap(int[] data, int i,int j){
        if(i == j){
            return;  
        }
        int tmp = data[i];
        data[i] = data[j];
        data[j] = tmp;
    }