The number one creation to J2SE 1.5 and enterprise/server-side development!An overseas bestseller for 8 years, simply JavaT 2 is the whole, available Java instructional for operating programmers in any respect degrees. totally up to date and revised, this 6th variation is greater than an interesting assessment of Java 2 average version (J2SE 1.5) and its libraries: it is also a realistic advent to brand new top company and server-side programming innovations. simply JavaT 2, 6th version, displays either J2SE 1.5 and the newest Tomcat and servlet standards. huge new assurance contains: * New chapters on generics and enumerated varieties * New insurance of net providers, with sensible examples utilizing Google and Amazon net companies * Simplified interactive I/O with printf() * Autoboxing and unboxing of primitive varieties * Static imports, foreach loop build, and different new language featuresPeter van der Linden offers professional recommendation, transparent reasons, and crisp pattern courses all through - together with dozens new to this version. alongside the best way, he introduces: * The middle language: syntax, items, interfaces, nested sessions, compiler secrets and techniques, and lots more and plenty extra * Key libraries: date and calendar, trend matching, community software program, mapped I/O, utilities and favourite collections * Server-side know-how: community server structures, a whole tiny HTML net server, and XML in Java * company J2EE: Sql and JDBCT educational, servlets and JSP and lots more and plenty extra * Client-side Java: basics of JFC/Swing GUI improvement, new classification info sharing information
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Here's an example using a class from the Java run-time library. Say you have an object of class Calendar, called "now". Calendar now = /*some initialization, not shown*/ Calendar has a method called get() which takes some arguments we will ignore. When we say "you invoke methods on an object", we mean you have to (implicitly or explicitly) provide a Calendar object, and the get() or other method will operate upon that. get( ); That is what it means to invoke a method on an object. Keep going this will fall into place soon.
It will convert the second operand into a string and append it onto the first string. In compiler terminology, you could say the "+" operator is overloaded for Strings. The final method in ClockView is refreshTimeDisplay(). It creates a new Timestamp object and calls its fillTimes() method to get the most up-to-date time. Then it assembles those values into a string containing hours, minutes and second separated by colons. Finally, it updates the label with this string, and calls repaint() to make the new text appear on the screen.
This is termed a narrowing primitive conversion, and it may lose information about the overall magnitude of a numeric value. It may also lose some digits of precision, and sign information (when converting to char, because chars are always interpreted as positive values). The cast tells the compiler that you, the programmer understand the information that may be lost, and have programmed accordingly. You might check the data before the conversion to ensure it is within a range where no information will be lost, for example.
Just Java 2: J2SE 1.5 by PetervanderLinden