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/** Author: Date: Language Version: Course: Section: File Name: Classes: Description: JChildress 2-12-07 Java2 1.5.0_06 CS1043 1 Hello.java Hello This program demonstrates how to output a message. */ public class Hello { public static void main( String[] args ) { System.out.printf( "Hello students.\n" ); } } // end of class Hello General Statements about the Java programming language: A Java program consists of blocks of program statements organized into classes and methods. Classes and methods consist of a o header line o body of code. The body of code is enclosed in a matching set of (curly) braces { … } Braces must be in matching pairs. Braces can be nested. Program statements end with a semicolon ; Header lines do not end with a semicolon Java is a free-form language. This means that the amount of empty space and new lines between operators, keywords, identifiers, classes, and methods is adjustable by the programmer. Example: public class Hello{public static void main(String[] args){System.out.printf("Hello students.\n")}} Java allows for annotations (aka comments) from the programmer using the // character sequence and the /*, */ character sequences. The compiler ignores all statements from the // to the end of the current line. The /*, */ combination is used to create a block of annotations. Everything between these character sequences is ignored by the compiler. Java is case sensitive: Hello is different from hello. The Java compiler is javac. It is used to find the syntax errors and convert the source into byte code. The Java interpreter is known as java. It is used to execute the statements using a computer. The Java interpreter is the Java Virtual Machine. Java programs are in files that have a program name prefix followed by the suffix .java o Our example is Hello.java