java--class Comparator

1. Product class

1  Public classProduct2 {3     Private intpid;4     PrivateString name;5     Private DoublePrice ;6 7      PublicProduct ()8     {9         //TODO auto-generated Constructor stubTen     } One  A      PublicProduct (intPID, String name,DoublePrice ) -     { -          This. PID =pid; the          This. Name =name; -          This. Price =Price ; -     } -  +      Public intgetpid () -     { +         returnpid; A     } at  -      Public voidSetpid (intpid) -     { -          This. PID =pid; -     } -  in      PublicString getName () -     { to         returnname; +     } -  the      Public voidsetName (String name) *     { $          This. Name =name;Panax Notoginseng     } -  the      Public DoubleGetPrice () +     { A         returnPrice ; the     } +  -      Public voidSetprice (DoublePrice ) $     { $          This. Price =Price ; -     } -  the}

2. Class Comparator: Overriding the Compare method

1  Public classMycompareImplementsComparator<product>//generic <Product> indicates that the comparer can only compare Product types2 {3 4 @Override5      Public intCompare (product P1, product p2)6     {7         if(P1.getprice () <P2.getprice ())8         {9             return-1;Ten         } One         Else if(P1.getprice () >P2.getprice ()) A         { -             return1; -         } the         Else -         //If the price is the same, sort by ID -         { -             if(P1.getpid () <p2.getpid ()) +             { -                 return-1; +             } A             Else if(P1.getpid () >p2.getpid ()) at             { -                 return1; -             } -             Else -             { -                 return0; in             } -         } to     } +  -}

3. Using comparators in ArrayList

1  Public classProductsort2 {3      Public Static voidMain (string[] args)4     {5     6Product P1 =NewProduct (1, "Popcorn Phone", 1000000.00);7Product P2 =NewProduct (2, "IPhone 7s", 5088.00);8Product P3 =NewProduct (3, "Xiaomi 5s", 1999.99);9Product P4 =NewProduct (4, "NIIT course", 12800.00);TenProduct P5 =NewProduct (5, "Patek Philippe", 1980000.00); OneProduct P6 =NewProduct (6, "Ma Electric", 1999.99); AProduct P7 =NewProduct (7, "Tiin course", 12800.00); -                 //Get array Prep sort -product[] Proarr ={p1, p2, p3, P4, P5, P6, p7}; the  -Arrays.sort (Proarr,NewMycompare ()); -  -          for(Product P:proarr) +         { -System.out.println (P.getpid () + "" + p.getname () + "" ++P.getprice ()); A         } at     } -}

java--class Comparator