java构造函数参数

一个类可以重载多个构造函数，只要他们的参数不同，当没有申明构造函数时，java将自动创建构造函数，若已申明带参数构造函数，必须申明无参数构造函数否则当你调用无参数构造函数时，将会编译错误对于一个普通的没有父类的类：TO a class ...

JAVA中 User 类中没有无参数的构造函数会造成什么结果？

JAVA URL类中的这个构造函数的参数是什么意思？

URL:public URL(URL context,String spec)throws MalformedURLExceptioncontext参数是什么意思？

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