CSE110 Lecture 02

Principles of Programming with Java
Introduction to Java
(202205)

Transcript

1. CSE110
   Principles of Programming
   with Java
   Lecture 02:
   Introduction to Java
   Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu | javiergs.com
   Office Hours: By appointment
   

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2. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 2
   Previously…
   

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3. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 3
   Previously …
   • The Java compiler translates Java source code into
   a special representation called bytecode
   • Java bytecode is not the machine language
   • Another software tool, called an interpreter (Java
   Virtual Machine), translates bytecode into machine
   language and executes it
   • Java is considered to be architecture-neutral
   

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4. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 4
   Previously…
   • Environments for developing Java software:
   o NetBeans
   o Eclipse
   o TextPad
   o BlueJ
   o IntelliJ
   o www.tutorialspoint.com/compile_java_online.php
   • Though the details of these environments differ, the
   basic compilation and execution process is
   essentially the same
   

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5. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 5
   Working online
   

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6. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 6
   Working local | IntelliJ
   

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7. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 7
   Steps that a programmer takes
   Write a program
   (instructions to a computer)
   Compile the program
   i.e., translate it to machine code
   Execute/Run the program
   i.e., tell the computer to execute
   each instruction
   Fix
   typos,
   grammar errors
   Fix
   logical error
   (semantic)
   

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8. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 8
   Lab 01
   • Lab 01 will be to install an
   IDE (Integrated Development Environment)
   for Java
   • IDE =
   Text Editor +
   Java Compiler +
   Java Virtual Machine +
   Fancy Tools
   

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9. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 9
   Java Program Structure
   • A program is made up of one or more classes
   • A class contains one or more methods
   • A method contains program statements
   

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10. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 10
    Java Program Structure
    public class TheClassName {
    }
    

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11. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 11
    Java Program Structure
    public class TheClassName {
    }
    public static void theFirstMethodName() {
    }
    public static void secondMethodName() {
    }
    

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12. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 12
    Example
    

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13. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 13
    Java Program Structure
    • program statements can be:
    • Variables – places to store information
    • Instructions – actions to be done
    

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14. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 14
    Java Program Structure
    

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15. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 15
    Java Program Structure
    public class TheClassName {
    }
    public void theFirstMethodName() {
    }
    public void secondMethodName() {
    }
    // instructions go here
    // instructions go here
    // variables go here
    // variables go here
    // variables go here
    

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16. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 16
    Reserved Words
    • The Java reserved words:
    abstract
    boolean
    break
    byte
    case
    catch
    char
    class
    const
    continue
    default
    do
    double
    else
    extends
    false
    final
    finally
    float
    for
    goto
    if
    implements
    import
    instanceof
    int
    interface
    long
    native
    new
    null
    package
    private
    protected
    public
    return
    short
    static
    strictfp
    super
    switch
    synchronized
    this
    throw
    throws
    transient
    true
    try
    void
    volatile
    while
    

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17. Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 17
    Homework
    Read Sections 2.1 and 2.2
    

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18. CSE110 - Principles of Programming
    Javier Gonzalez-Sanchez
    javiergs@asu.edu
    Summer 2022
    Disclaimer. These slides can only be used as study material for the class CSE110 at ASU. They cannot be distributed or used for another purpose.
    

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