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This article will explain in detail how to use the TreeSet collection, the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have some understanding of the relevant knowledge after reading this article.

Requirements: keyboard input 5 student information (name, Chinese score, math score, English score), according to the total score from high to low output to the console. Analysis: 1. Create keyboard input object

2. Create the TreeSet collection, implement the Comparator interface using anonymous inner classes, and override the compara method.

3. Judge the number of elements in the set and add elements to it

4. Traverse the collection

Class Demo_TreeSet {

Public static void main (String [] args) {

Scanner sc = new Scanner (System.in)

System.out.println ("Please enter the student's score format, Chinese, math, English, total score")

TreeSet ts = new TreeSet (new Comparator {

Public int compara (Student S1, Student s2)

Int num = s2.getSum ()-s1.getSum ()

Return num = = 0? 1: num

});

While (ts.size ()

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