Core Java Technology Section Index | Page 3

The start() method tells the Java Virtual Machine that it needs to create a system specific thread. After creating the system resource, it passes the Runnable object to it to execute its run() met...more

Check out logging packages like log4j and unit testing frameworks like JUnit. Check out static analysis tools such as Metamata's Audit and Metrics products. For dyanmic analysis and manipulati...more

You can put the default: labeled clause anywhere you can put any of the switch's cases. In fact, you don't have to specify a default case at all.

For changes between Java v1.0 and v1.1 check out: JDK 1.1.x Compatibility with Previous JDK Releases and JDK v1.1 New Features Summary. For changes between Java v1.1 and v1.2 check out the JDK v1...more

Java provides escape sequences for several non-graphical characters. All characters can be specified as a hexidecimal Unicode character (uxxxx) with some as an octal character (ddd where the first...more

The capability of using the final modifier on formal parameters was introduced in the Java 1.1 update. Basically, it's just like using final on a class field. That is to say that using it tells ...more

Well, there's no direct support for variable-length method argument lists in Java. However, you can simulate this yourself using whatever object container you prefer such as the ubiquitous java.u...more

The strictfp keyword may be applied to both classes and methods. For classes (and interfaces), it specifies that all of the expressions in all of the methods of the class are FP-strict. For met...more

Overloaded methods are multiple methods in the same class that share the same name but have different parameter lists. Overloaded methods cannot have the same parameter lists with different return...more

Instance variables have separate values for each instance of a class. Class variables maintain a single shared value for all instances of the class, even if no instance object of that class exists...more

The wacky thing about Java is that bytes, shorts, ints, and longs are all signed. Thus, the code: byte b = 0xAA; will generate an error (rather than a warning): possible loss of precision fo...more

    A: Short answer: Forget about Java 2 security (i.e. the policy file) when creating applets. No major web browser currently supports that security model. Instead, place the applet in ...more

Basically, you can't. Plus, not all platforms have environments to get variables from. Instead of using the environment to get something, consider using either resource files or System properties....more

See How do I add a search engine to my web site? (though this covers searching your site, not the whole Internet). Running a Web Crawler is a pretty big job. Do you have a couple of terabytes of...more

    The static initializer is executed only when the arent class gets loaded. class Parent { static { //static initializer System.out.println("executed"); } } class Child1 ex...more