Xiaozhong Wang

In September 2002, Sun released the J2ME Personal Profile 1.0. Unlike the MIDP, which is the core technology for Java-enabled wireless phones based on Connected Limited Device Configuration (CLDC), Personal Profile is based on the Connected Device Configuration (CDC). The CDC provides a virtual machine that includes a full Java 2 Virtual Machine feature set. Compared to CLDC, it assumes more memory and higher availability on network connections. The Personal Profile contains a full set of AWT APIs that support a graphical user interface (GUI), including support for applets and Xlets, and provides a complete application environment for the high-end PDA market. It expands the J2ME territory to include devices that require a full GUI and a high degree of compatibility with ... (more)

How to Provide Dynamic Security Permissions

For various reasons, an application may install a security manager. Usually it does so to guard against malicious third-party code either installed or dynamically downloaded at runtime. If the application uses RMI APIs, it's even required by a Java specification that a security manager be installed, otherwise the classloader will not download any classes from remote locations. The most ... (more)

Java Developer's Journal: "@ See Javadoc"

My dear wife has just started to learn to use Java in her work and asks me a lot of questions as she begins her journey in this wonderful language. To almost all her questions my answer is the same: "See Javadoc." In addition to being a way of avoiding having to find or know the answer, it constantly surprises me what is available in the Javadoc and how useful a source of information it c... (more)