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Unit 2 - Structure of a Java Program - Documentation - Types of Errors - Example PowerPoint PPT Presentation

Unit 2 - Structure of a Java Program - Documentation - Types of Errors - Example  Java’s Compiler + Interpreter Editor : Compiler : 7  MyFirstProgram.java  MyFirstProgram.class K This is you… Interpreter Interpreter Interpreter Structure of a Java Program

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Unit 2 - Structure of a Java Program - Documentation - Types of Errors - Example

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Unit 2- Structure of a Java Program- Documentation- Types of Errors- Example


Java’s Compiler + Interpreter

Editor

:

Compiler

:

7

MyFirstProgram.java

MyFirstProgram.class

K

This is

you…

Interpreter

Interpreter

Interpreter


Structure of a Java Program

For Unit 2, you will be writing the most basic form of Java Programs. They look like this:

publicclass SomeName

{

public static void main (String [ ] args)

{

statement;

statement;

statement;

}

}

This name must match the filename.

This is where the program starts.

It looks for the “main method” and

begins here.


Documentation(called “comments” in Computer Science)

// Name:

// Last Changed:

// Description: What does this program do.

publicclass SomeName

{

public static void main (String [ ] args)

{

statement;

}

}

At the top of each file, I would like you

have the following documentation


Types of Errors

Syntax Error: an error that the compiler gives you. This could

be a missing “;” misspelled word, missing (), etc

Logic Error: an error that causes the program to not work

correctly. A.K.A. “Software Bugs”

Example: If the program required you

to draw an octagon and you drew a hexagon.


The First “Bug”

“(moth) in relay”


Output to the console screen in Java (the little black screen)

  • Two output methods:

  • System.out.println(someString);

  • System.out.print(someString);

Examples

String firstName = “Mike”;

String lastName = “Efram”;

System.out.println(firstName);

System.out.println(lastName);

System.out.print(firstName);

System.out.print(lastName);

System.out.println(firstName + “ ” + lastName);


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