Java中，仅使用传递的参数泛型类型创建实例

import java.lang.reflect.Constructor;

public class GenericInstanceCreator<T> {

    private Class<T> clazz;

    public GenericInstanceCreator(Class<T> clazz) {
        this.clazz = clazz;
    }

    public T createInstance() throws Exception {
        Constructor<T> constructor = clazz.getDeclaredConstructor();
        constructor.setAccessible(true); // 如果构造函数是私有的，这行代码可以使其可访问
        return constructor.newInstance();
    }

    public static void main(String[] args) {
        try {
            GenericInstanceCreator<String> creator = new GenericInstanceCreator<>(String.class);
            String instance = creator.createInstance();
            System.out.println(instance); // 输出可能是null，因为String的默认构造函数不接受参数且返回null
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}