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.
Lanthanum or La (57). This silver-white metal is one of the most reactive rare earth elements. It is used to make special optical glasses, including infrared absorbing glass, camera and telescope lenses, and can also be used to make steel more malleable.Other applications for lanthanum include wastewater treatment and petroleum refining.candium, a silvery-white metal, is a non-lanthanide rare earth. It is used in many popular consumer products, such as televisions and fluorescent or energy-saving lamps. In industry, the primary use of scandium is to strengthen metal compounds.