「java」Genericsで指定された型パラメータを取得する

Javaコード

import java.lang.reflect.Array;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
public class Generic extends Base<String> {
public static void main(String[] args) {
Generic kdf = new Generic();
System.out.println(kdf.array);
}

Object array ;
public Generic() {
array = Array.newInstance(getGenericType(0), 100);
}
}
class Base<T> {
@SuppressWarnings(“rawtypes")
public Class getGenericType(int index) {
Type genType = getClass().getGenericSuperclass();
if (!(genType instanceof ParameterizedType)) {
return Object.class;
}
Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
if (index >= params.length || index < 0) {
throw new RuntimeException(“Index outof bounds");
}
if (!(params[index] instanceof Class)) {
return Object.class;
}
return (Class) params[index];
}
}

Java

Posted by arkgame