By default sorting is in ascending order. Collections.sort(list); method sort the list items in ascending order. Collections.reverse(list); method sort the list items in descending order. Same as you can sort the arrays also, Let refer the below code snippet, which sort the string array contains name of cities.orting using Comparator. Let have look to sort Employee list using implementation of Comparator interface. If you want to sort object other than their natural ordering at that time we use Comparator.
Thallium is a soft, malleable gray metal that was previously widely used in rat poisons and insecticides. Thallium itself and compounds containing the element are highly toxic. It is particularly dangerous because compounds containing thallium are colorless, odorless, and tasteless.hallium is a soft, malleable gray metal that was previously widely used in rat poisons and insecticides. Thallium itself and compounds containing the element are highly toxic. It is particularly dangerous because compounds containing thallium are colorless, odorless, and tasteless.
Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray post-transition metal is not found free in nature. When isolated, it resembles tin, but discolors when exposed to air.