下面Java代码中问号处的lambda表达式传入的参数代表什么意思？

Arrays.parallelSort(arr1, (o1, o2) -> o1.length() - o2.length());    //arr1按元素长度排序
Arrays.parallelPrefix(arr2, (left, right)-> left * right);  //arr2累次相乘,
/*结果由
[
   (3*-4), 
   (3*-4*25), 
   (3*-4*25*16), 
   (3*-4*25*16*30), 
   (3*-4*25*16*30*18)
 ]
得出*/
Arrays.parallelSetAll(arr3 , operand -> operand * 5); //arr3每个元素乘5

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