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Introduction to Programming: Hello World App in Java

Learn how to create a simple Java program that prints "Hello World!" to the console. This tutorial covers the basic structure of a Java program, syntax errors, and common runtime errors.

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Introduction to Programming: Hello World App in Java

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  1. COM S 207 The First Program Instructor: Ying Cai Department of Computer Science Iowa State University yingcai@iastate.edu

  2. Hello World! /** * The HelloWorldApp class implements an application * that simply prints "Hello World!" to standard output. */ class HelloWorldApp { public static void main(String[] args) { System.out.println("Hello World!"); // Display the string } } • A few things to note: • Plain text editor • Comments • Class definition • The main method • Object, method, parameters • Java is case sensitive • Coding style

  3. Basic Program Structure class CLASSNAME { public static void main(String[] args) { STATEMENT } }

  4. Common Errors • Compile-time errors • A program contains syntax (or grammar) errors • The Compiler does not understand your code, and so won’t translate your code into JVM instructions • Run-time errors • Your program runs, but does not produce correct results • Syntax is fine, but logic is wrong

  5. Start Edit Program Compile Program Syntax Error? Yes No Run Program Run-time Errors? Yes No End

  6. Announcements • Read chapter 2 (2.1, 2.2., 2.3)

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