• Office hours: posted!

• (continued from slide 8)
  • Lecture notes: 203-introduction.pdf
    
    

Origins of Java (sidebar 2.1) 1)

• Java is a successor to Scheme and SmallTalk (among other languages).
• Java is only superficially (syntactically) similar to C and C++. Semantically, Java is very different from these and other languages.

Packages 2)

• Java source files may be organized into packages. Every source file in package p must begin with the declaration

  package p;

  and must be stored in a subdirectory called p.

• A class declared in a source file with no package declaration belongs to the anonymous default package.
• Our BlueJ projects last year in 102 were all default package projects, but the projects we create in Netbeans this semester will all have explicit package declarations.
• Class C within package p may be imported explicitly using

  import p.C;

  or all classes within package p may be imported using wildcard notation:

  import p.*;

• Let’s take a look at named and default packages in Netbeans.

Objects and Variables 3)

• Stack and Heap diagrams figure 2.2 (p. 19)
• Exercises 2.1, 2.2, 2.3, 2.4
  • Exercises 2.1, 2.2, and 2.3 are HW for next Monday’s class