定义:
Button t=new Button("ok");
声明:
Button t;
Button t=new Button("ok");
声明:
Button t;
解决方案 »
- URLConnection获取html源码不完整,SOS.......
- (请问,请帮忙)我用进栈的思想写了个删除字符串里重复的字符,但是有问题(附代码),想了好久也不知道错在哪?
- equals问题
- 关于字的问题,请有知道的人告诉一下,谢谢。
- 我对多态的理解,求解多态在面向对象方面的实际意义。
- 讨论:做数据库是好java还是PowerBuilder好。讨论者都有分
- 需要连接数据库,然后有一些问题....
- 关于JOptionpane的问题。
- applet 支持socket嘛??
- 又来麻烦老哥老姐们了,搞了一个星期了,请问如何......?(一个十分想学好JAVA的弟弟),谢谢您!
- 快快快!
- 关于异常处理
6.1 Declarations
A declaration introduces an entity into a program and includes an identifier (§3.8) that can be used in a name to refer to this entity. A declared entity is one of the following:A package, declared in a package declaration (§7.4)
An imported type, declared in a single-type-import declaration (§7.5.1) or a type-import-on-demand declaration (§7.5.2)
A class, declared in a class type declaration (§8.1)
An interface, declared in an interface type declaration (§9.1)
A member of a reference type (§8.2, §9.2, §10.7), one of the following:
A member class (§8.5, §9.5).
A member interface (§8.5, §9.5).
A field, one of the following:
A field declared in a class type (§8.3)
A constant field declared in an interface type (§9.3)
The field length, which is implicitly a member of every array type (§10.7)
A method, one of the following:
A method (abstract or otherwise) declared in a class type (§8.4)
A method (always abstract) declared in an interface type (§9.4)
A parameter, one of the following:
A parameter of a method or constructor of a class (§8.4.1, §8.8.1)
A parameter of an abstract method of an interface (§9.4)
A parameter of an exception handler declared in a catch clause of a try statement (§14.19)
A local variable, one of the following:
A local variable declared in a block (§14.4)
A local variable declared in a for statement (§14.13)
Constructors (§8.8) are also introduced by declarations, but use the name of the class in which they are declared rather than introducing a new name