Java History Key Events 1991-1995

Java History ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sample Program - HelloWorld ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Key words are lower case (Java is a case sensitive language). Semi-colons are used to end Java statements; however, not all lines of a Java program end a statement. ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Lines vs. Statements & Variables

Variables ,[object Object],72 The Java Virtual Machine (JVM) actually decides where the value will be placed in memory . 0x000 0x001 0x002 0x003 0x004 0x005 0x006 0x007 Assume that the this variable declaration has been made. int length = 72; The variable length is a symbolic name for the memory location 0x003.

Compiler ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Program Development Process Text editor Source code (.java) Saves Java statements Java compiler Is read by Byte code (.class) Produces Java Virtual Machine Is interpreted by Program Execution Results in

Compiling a Java Program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],javac is the Java compiler. java is the Java execution software.

Java History Key Events 1991-1995

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Java History Key Events 1991-1995