jdk生成證書有什么用？

包括下列三種： Java認證考試 關于Java方面，Sun推出七項認證： Sun Certified Java Programmer for the Java 2 Platform、 Sun Certified Developer for the Java 2 Platform Sun Certified Web Component Developer for the Java 2 Platform, Enterprise Edition 1.4 Sun Certified Business Component Developer for the Java 2 Platform, Enterprise Edition Sun Certified Web Services Developer for the Java 2 Platform, Enterprise Edition Sun Certified Enterprise Architect for the Java 2 Platform, Enterprise Edition Sun Certified Mobile Application Developer for the Java 2 Platform, Micro Edition Solaris系統管理認證考試 Sun 公司為用戶提供支持 Solaris 10 操作系統的高品質培訓和認證服務，可幫助企業最大限度地快速實現該創新操作系統的重要價值。