Active Document Translation Java Technolo Developed by Sun Microsystems Conventional applications Active documents(applets) achine-independent binar Run-time system a Browser interprets binary Class library Java Run-Time Environment Java Language Characteristics Characteristics High level Interpretative execution a General pur roose Automatic garbage collection Similar to C++ Multi-threaded execution Object oriented a Internet access Strongly typed Graphics support Statically type checked Concurrent Java Library Choice of Graphics Interface a Classes for Tava includes an extensive graphics toolkit Graphics manipulation that consists of run-time su Low-level network I/O cs as wel∥ as inter Interaction with a Web server Run-time system access handles details, or a low-leve/ interface, in File I/O Conventional data structures which the applet handles details. Event capture11 哈工大计算机学院 李全龙 Network Application Development Server Software Design 61 Active Document Translation „ Compiler produces machine-independent binary „ Browser interprets binary 哈工大计算机学院 李全龙 Network Application Development Server Software Design 62 Java Technology „ Developed by Sun Microsystems „ Used for „ Conventional applications „ Active documents (applets) „ Includes „ Programming language „ Run-time system „ Class library 哈工大计算机学院 李全龙 Network Application Development Server Software Design 63 Java Language Characteristics „ High level „ General purpose „ Similar to C++ „ Object oriented „ Dynamic „ Strongly typed „ Statically type checked „ Concurrent 哈工大计算机学院 李全龙 Network Application Development Server Software Design 64 Java Run-Time Environment Characteristics „ Interpretative execution „ Automatic garbage collection „ Multi-threaded execution „ Internet access „ Graphics support 哈工大计算机学院 李全龙 Network Application Development Server Software Design 65 Java Library „ Classes for „ Graphics manipulation „ Low-level network I/O „ Interaction with a Web server „ Run-time system access „ File I/O „ Conventional data structures „ Event capture „ Exception handling 哈工大计算机学院 李全龙 Network Application Development Server Software Design 66 Choice of Graphics Interface Java includes an extensive graphics toolkit that consists of run-time support for graphics as well as interface software. The toolkit allows a programmer to choose a high-level interface, in which the toolkit handles details, or a low-level interface, in which the applet handles details