Java:创建一个类型为类型参数的对象

import java.lang.reflect.Constructor;

public class MyClass<T> {
    private T obj;

    public MyClass(Class<T> clazz) throws Exception {
        Constructor<T> constructor = clazz.getConstructor();
        obj = constructor.newInstance();
    }

    public T getObj() {
        return obj;
    }
}

public class Main {
    public static void main(String[] args) {
        try {
            MyClass<String> myClass = new MyClass<>(String.class);
            String obj = myClass.getObj();
            System.out.println(obj); // 输出 ""（空字符串）
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}