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Introduction to Java Programming: Basics and DrJava Environment

Learn how a computer operates, communicates, and understands Java code. Get hands-on experience using DrJava and discover the fundamentals of expressions and statements in Java programming.

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Introduction to Java Programming: Basics and DrJava Environment

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  1. CSE 113 Week 1 January 14 – 18, 2008

  2. Monday • Syllabus • Course Policies

  3. Wednesday Announcements • If you do not have a syllabus, please come get one. • If you have not signed and turned in the last page of the syllabus, please do so. • If you are having registration issues, please come and see me.

  4. Wednesday Game Plan • Questions about course/policies • Recitation Change Form • Introduce themes of course

  5. Wednesday • How does a computer work? • What does it really understand? • How do we speak to a computer?

  6. Friday Announcements • Need syllabus? Come down and get one. • Make sure to turn in signed last page of syllabus • Lab change form – fill out and return if needed • No class Monday

  7. Friday Game Plan • Introduction to DrJava environment • Expressions • Statements

  8. Friday • DrJava is broken up into three panes: files, definitions, interactions • We will spend the first part of the semester working in the interactions pane • There we can type Java code and have DrJava evaluate it for us

  9. Friday • Expressions are code that can be evaluated to produce a result • Arithmetic expressions • 3 + 4 • Hit enter, and DrJava reports 7 as the result of evaluating that expression

  10. Friday • Putting a ; at the end of an expression turns it into a statement • DrJava does not return the value that results • You can use a special statement, System.out.println(“Text”); To print the word Text to the screen.

  11. Friday • The types of things are very important to Java • Numbers that are whole numbers (integers) are treated differently than those with a fractional part (real numbers) • Typing in ½ gives a result that may be surprising

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