Java 17-8 Tressset Comparator ordering elements

1  PackageZl_treeset;2 3 ImportJava.util.Comparator;4 ImportJava.util.TreeSet;5 6 /*7 Store custom objects and traverse them with the Streeset collection. This time, sort by comparator .8 Public TreeSet (Comparator Comparator) Comparator sorting9 There are two ways of doing this:Ten 1: Create a class that comparator as an interface, One 2: If the parameter of a method is an interface, then what really wants is an object of the implementation class of the interface A and the anonymous inner class can implement this. -  - (new class name or interface name () { the override method; -  }  ); -  - Create a TreeSet collection, add animal objects, and sort by the following rules: + symbol name length short in front -  */ +  Public classTreeSetDemo2 { A  at      Public Static voidMain (string[] args) { -         //Public TreeSet (Comparator Comparator) Comparator sorting -         //Mode 1: Create a class that comparator as an interface, and then create -         //treeset<person> ts = new treeset<person> (new Mycomparator ()); -  -         //Mode 2: Internal anonymous class intreeset<person> ts =NewTreeset<person> (NewComparator<person>() { -              Public intCompare (Person A1, person A2) { to  +                 //Compare name Length -                 intNUM1 = A1.getname (). Length ()-a2.getname (). Length (); the  *                 //same length, then compare the name content $                 intnum2 = NUM1 = = 0?a1.getname (). CompareTo (A2.getname ())Panax Notoginseng : NUM1; -  the                 //name exactly the same, then the length of the province to Judge +                 intnum3 = Num2 = = 0?a1.getstate (). Length () A-a2.getstate (). Length (): num2; the  +                 //the same as the length of the province, then the content comparison -                 intNUM4 = Num3 = = 0?a1.getstate (). CompareTo (A2.getstate ()) $ : num3; $  -                 //It's all the same, age comparison. -                 intNUM5 = Num4 = = 0? A1.getage ()-a2.getage (): NUM4; the  -                 returnNUM5;Wuyi             } the         }); -  Wu         //To create a custom object -person P1 =NewPerson ("Big Bear", "Northeast", 21); Aboutperson P2 =NewPerson ("Bear II", "Sichuan", 17); $Person P3 =NewPerson ("Big Bear", "Fujian", 21); -Person P4 =NewPerson ("Big Bear", "Fujian", 20); -Person P5 =NewPerson ("Bear II", "Guangdong", 17); -Person P6 =NewPerson ("Big Bear", "Northeast", 21); APerson P7 =NewPerson ("Big Bear", "Fujian", 21); +  the         //add into Collection - Ts.add (p1); $ Ts.add (p2); the Ts.add (p3); the Ts.add (p4); the Ts.add (p5); the Ts.add (P6); - Ts.add (P7); in  the         //to traverse the          for(person p:ts) { AboutSystem.out.println (P.getname () + "\ T" + p.getstate () + "\ T" the+p.getage ()); the         } the  +     } -  the}

Java 17-8 Tressset Comparator ordering elements