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 has 25 isotopes which have atomic masses that range from 184 to 210. 203 Tl and 205 Tl are the only stable isotopes, and 204 Tl is the most stable radioisotope, with a half-life of 3.78 years.205 Tl represents the final decay product of the 4n+1 decay chain (also known as the neptunium series).hallium is found in the minerals crookesite TlCu 7 Se 4, hutchinsonite TlPbAs 5 S 9, and lorandite TlAsS 2. Thallium also occurs as a trace element in iron pyrite, and thallium is extracted as a by-product of roasting this mineral for the production of sulfuric acid.