這是我的代碼: ExecutorImp擴展AbstractExecutor,它提取執行程序的相同執行邏輯(ExecutorImp是一種情況),當調用ExecutorImp的execute()方法時,它將調用超類型的方法,但超類型(該AbstractExcutor)應該知道另一個類結合實施者(在本例中,它是User類):如何在運行時獲得泛型類型?
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
abstract class AbstractExecutor<E> {
public void execute() throws Exception {
ArrayList<E> list = new ArrayList<E>();
// here I want to get the real type of 'E'
Class cl = this.getClass().getTypeParameters()[0].getGenericDeclaration().getClass();
Object o = cl.getConstructor(String.class).newInstance("Gate");
list.add((E) o);
System.out.println(format(list));
}
public abstract String format(ArrayList<E> list);
public abstract String getType();
}
public class ExectorImp<E> extends AbstractExecutor<User> {
@Override
public String getType() {
return "user";
}
@Override
public String format(ArrayList<User> list) {
StringBuffer sb = new StringBuffer();
for (User u : list) {
sb.append(u.toString() + " ");
}
return sb.toString();
}
public static void main(String[] args) throws Exception {
new ExectorImp().execute();
}
}
class User {
String name;
public User(String name) {
this.name = name;
}
}
那麼,什麼是我的代碼的問題?
也許這個答案可以幫助您解決問題。 HTTP://計算器。com/questions/6624113/get-type-name-for-generic-parameter-of-generic-class/19454610#19454610 – 2017-01-12 01:01:23