CMSC433, Spring 2001 Programming Language Technology and Paradigms …

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Basic Java, continued. Alan Sussman. February 12, 2002. CMCS 433, Spring 2002 - Alan Sussman. 2. Administrivia. . Project 1 due Wednesday, 6PM …

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CMSC 433, Alan Sussman, U. Maryland (via
Bill Pugh) 1
CMSC433, Spring 2001
Programming Language
Technology and Paradigms
Basic Java, continued
Alan Sussman
February 12, 2002
CMCS 433, Spring 2002 - Alan Sussman 2
Administrivia
?Project 1 due Wednesday, 6PM
- threads issue
- anyone not get email to reflector?
- projects for commentary emailed after late
deadline
?Second Java project posted soon
CMCS 433, Spring 2002 - Alan Sussman 3
Last time - Java
?Instance variable/method modifiers
- both: public, protected, package, private, static
- method: abstract, final, native, synchronized
- field: transient, volatile, final
?Overriding/Overloading
?Constructors
- call another constructor or super() first
?Static methods/instance variables
- associated with Class object
- Class object used for reflection operations
?Interfaces are types
CMCS 433, Spring 2002 - Alan Sussman 4
Types
?A type describes a set of values that can be:
- held in a variable
- returned in an expression
?Types include:
- primitive types - boolean, char, short, int , .
- Reference types:
?Class types
?Array types
?Interface types
CMCS 433, Spring 2002 - Alan Sussman 5
Class types
?…