Java programming Ideas-generics-Simple generics example

Base type cannot be a type parameter

The code is as follows:

/** *  */ PackageTest.thinkinjava.Generics;Importjava.util.ArrayList;Importjava.util.List;/** * @authorLuo **/ Public classAbc<t> {    Privatelist<t> list =NewArraylist<t>(); PrivateT element; @Override PublicString toString () {returnlist.tostring (); }     Public voidaddlist (T element) { This. List.add (Element); }     PublicT getelement () {returnelement; }     Public voidsetElement (T element) { This. Element =element; }     Public Static voidMain (string[] args) {ABC<String> abcstring =NewAbc<string>(); Abcstring.addlist (A); Abcstring.addlist ("B"); Abcstring.addlist (C); Abcstring.addlist ("D"); Abcstring.addlist (E);        System.out.println (Abcstring.tostring ()); Abcstring.setelement ("Okda"); System.out.println (Abcstring.getelement ()instanceofString); ABC<Integer> Abcinteger =NewAbc<integer>(); Abcinteger.addlist (1); Abcinteger.addlist (2); Abcinteger.addlist (3); Abcinteger.addlist (4); Abcinteger.addlist (5);        System.out.println (Abcinteger.tostring ()); Abcinteger.setelement (1234567899); System.out.println (Abcinteger.getelement ()instanceofInteger); }}

The above t can also be replaced with other English letters

The output is

Java programming Ideas-generics-Simple generics example