java - Return subClass -

java - Return subClass -

my question quite easy, cannot figure out how implement want.

i implement method which, depending of given parameter, returns 1 subclass or (i understand have behavior in class create development more object oriented, i'm still learning).

so thought of solution, not compile.

public abstract class a(){ //some code } public class b extends a(){ //some code } public class c extends a(){ //some code } public static void main(string[] args) { system.out.println("input: "); scanner console = new scanner(system.in); string input=console.nextline(); myobject = getobject(input); } public static <? extends a> getobject(string input){ if(input.indexof("b") != -1){ homecoming new b(); } if(input.indexof("c") != -1){ homecoming new c(); } homecoming null; }

first, need remove brackets (()) class definitions:

public abstract class { //some code } public class b extends { //some code } public class c extends { //some code }

second, getobject should homecoming a:

public static getobject(string input){ if(input.indexof("b") != -1){ homecoming new b(); } if(input.indexof("c") != -1){ homecoming new c(); } homecoming null; }

java generics inheritance