java語言程序設計(java語言概述)ppt-wenkub
2023-01-21 04:53:18 本頁面
【正文】 operating system Eric Schmidt: Former Sun Microsystems chief technical officer, Former Novell chairman and CEO, Chairman of the Board and CEO, Google Inc. 8 Java的發(fā)展 ? 歷史記錄 * 7: A new SPARC based, handheld wireless PDA, with a 5 color LCD with touchscreen input 9 Java的發(fā)展 10 Java的發(fā)展 ? 五年回顧 (1996－ 2021) ? 1995年 ? May 23, Java technology launched ? 1996年 1. Jan 23, JDK software release 2. May 29, first JavaOne developer conference (JavaBeans, Java Media APIs, servlets, etc) 3. July 10, 50,000 people attend Sun Java Day in Tokyo 4. Aug 16, Sun/AddisonWesley (The Java Tutorial and the first Java Language Specification) 5. Sep, 83,000 Web pages have incorporated Java technology 6. Oct 25, Sun announces first JustInTime (JIT) piler for Java platform 7. Oct 29, Java Card API announced 8. Dec 9, JDK beta software released 11 Java的發(fā)展 ? 五年回顧 (1996－ 2021) ? 1997年 1. Feb 18, JDK release ships 2. Mar 4, Java Web Server beta and Java Servlet Developers Kit software released 3. Mar 10, Java Naming and Directory Interface (JNDI) API introduced 4. Mar 11, More than 220,000 downloads of JDK software in just three weeks 5. Apr 2, JavaOne conference (10,000 attendees, the world39。s largest developer conference), Enterprise JavaBeans technology 6. Aug 5, Java Media and Communication APIs released 7. Aug 5, More than 100,000 downloads of JavaBeans Development Kit software 8. Sep 23, Java Developer Connection program has 100,000+ members 12 Java的發(fā)展 ? 五年回顧 (1996－ 2021) ? 1998年 1. Jan 20, JDK software release downloads top 2 million 2. Mar 24, JavaOne conference draws 15,000 3. Mar 31, Ericsson, Sony, Siemens, BEA, OpenTV and others license Java technology 4. June 3, Visa launches world39。 Portable) 5. 魯棒和安全 (Robust amp。 } } 簡單的 Java應用程序 32 ? 定義類文件 3. 類名稱與 Java源程序名一致 class MyClass { . . . } 所保存的文件為 : 注意 : 大小寫敏感 簡單的 Java應用程序 33 ? 注解方式 (Comments) 1. /** ~~~ */－文檔注解 2. /* ~~~ */ －程序內(nèi)的任意位置 3. //－對本行注解 /** * Exam1_1 class實現(xiàn)一個應用 * 將特定的字符串顯示到標注輸出 */ public class Exam1_1 { public static void main(String[] args) { (“This is a Java Application Program.)?！苯Y(jié)尾 3. 對齊和縮進 4. 區(qū)分大小寫 /** * Exam1_1 class實現(xiàn)一個應用 * 將特定的字符串顯示到標準輸出 */ public class Exam1_1 { public static void main(String[] args) { (“This is a Java Application Program.)。 } } 2. 引入整個包 (Package) import .*。 public class HelloWorld extends Applet { public void paint(Graphics g) { (Hello world!, 50, 25)。 } } 簡單的 Java小程序 (Applet)
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