将泛型类型提取到变量中的方法

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public class GenericTypeExtractor<T> {
    private Class<T> genericType;

    public GenericTypeExtractor() {
        Type superClass = getClass().getGenericSuperclass();
        if (superClass instanceof ParameterizedType) {
            ParameterizedType parameterizedType = (ParameterizedType) superClass;
            Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
            if (actualTypeArguments.length > 0) {
                genericType = (Class<T>) actualTypeArguments[0];
            }
        }
    }

    public Class<T> getGenericType() {
        return genericType;
    }

    public static void main(String[] args) {
        GenericTypeExtractor<String> extractor = new GenericTypeExtractor<String>() {};
        Class<String> genericType = extractor.getGenericType();
        System.out.println(genericType);  // 输出：class java.lang.String
    }
}