Java beispielprogramme download

Download aller Beispielprogramme Download. Inhaltsverzeichnis 1 Einige Grundbegriffe aus der Welt des Programmierens. Zur Anzeige muss JavaScript eingeschaltet sein!

Weitere Informationen Akzeptieren Ablehnen. Version 1. Version 2. Demonstration zur richtigen Verwendung von Unterstrichen in numerischen Literalen. Demonstration zur falschen Verwendung von Unterstrichen in numerischen Literalen. Dieses Programm zeigt, wie ein Terminkalender ohne Verwendung von Feldern nur schwer programmiert werden kann. Das Programm liest Kommandozeilenparameter aus und verwertet sie in einem Gruss.

Der Zugriff auf private Bestandteile der Klasse wird durch Methoden gekapselt. Version A. Version B. Version C. We recommend you to set the maximum heap size between M to M for small and medium Java application. We can increase the heap size to any value that we want but remember that RAM must support that value.

Suppose, we want to set the maximum heap size to 80M. We can use any of the following flags for setting up the maximum heap size. All the commands allocate the same heap size. The above Xmx flags allocate the Java heap memory to a maximum size of 80MB. Note that there is no space between the flag -Xmx and memory size 80M. It does not matter if you are using an uppercase or lower-case letter.

For example, -Xmx80M is the same as -Xmx80m. It means that the application can use the maximum heap size of 80M of the available memory. Step 2: Click on the Advanced system settings. It opens the System Properties window. It opens the Environment Variables dialog box. You can put any value in place of After that, click on the OK button three times. If the Java process has exceeded the -Xmx maximum Java heap size, the popular java. OutOfMemoryError will be thrown.

Java provides more options for controlling the Java application memory. If we want to see which options are available for memory, we can use the java -X command. It shows the different options available for handling the memory.

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Please mail your requirement at [email protected] Duration: 1 week to 2 week. Java Training Java Tutorial. Abstract class Interface Abstract vs Interface. Package Access Modifiers Encapsulation. Reinforcement Learning. The first one is only about 6 lines of code, and just illustrates some very basic graphics and event handling. The second shows how one can dynamically create controls at run time the items on the palette , how controls can be positioned at runtime, and how controls can be resized when the window is resized.

Its a longer program, but well worth going through to see how these features work. See Tutorial 2 for step by step instructions for how these programs work. Saul Greenberg vbDrawpad A simple object-oriented drawing editor that allows a user to create, move and erase squares. You can easily extend this to include different graphical classes e. The program illustrates how to do simple object-based interactive graphics in VB how to use a collection how to use a class Saul Greenberg vbDynamicQueries This program is similar to the drawing editor above, but used for completely different purposes.

It illustrates how to do dynamic queries on city attributes, where cities on a map are filtered immediately as a person moves a slider or checks a checkbox. While the example is simple, the possibilities of how you can enhance it are endless. Click on the image to view it in full size. Saul Greenberg vbTableLens Illustrates how to create a very simple table lens that toggles cells between graphical and textual views.

Rod Stephens vbDragPicture Illustrates how to Bitblit a picture on another picture, and how to drag it around. Rod Stephens vbDragTreeNode Illustrates how to use the Tree control and how to drag items around different parts of the tree Rod Stephens vbMoveControls An example application that lets a user interactively move different kinds of controls on a display.

Illustrates interactive graphics. Saul Greenberg vbclassexample Illustrates how to create a simple class that raises events Saul Greenberg vbFlexdata-example Illustrates a database with the flex control. The database just has two fields: name and phone.

This example lets you add and remove records. The record is just added to the end of the file, but the flex grid shows it sorted. See also Tutorial 3 and Tutorial 4 for other ways to access databases.

Shaun Kaasten vbShapedControls Illustrates how you can clip the shape of a control or form to a variety of regions. It just contains a label saying "Hello World" and has no code attached to it.

However, it does have a toolbox control icon. Includes an example program. Saul Greenberg TickerTape A tutorial and example project that shows you how to build a TickerTape control out of a label. It also illustrates the ActiveX Control Wizard. Mike Rounding Rod Stephens ElusiveProfessor A VB ActiveX Control that creates a 'new' type of button actually a standard but augmented command button that moves away from the person who is trying to click it.

The design was based upon a class project where students had to design a button that reflected their personality. Saul Greenberg FollowMe This program creates a command button that will follow the mouse around. This simple but very useful example illustrates. I include it to show you how you can do interactive graphics well, at least some simple stuff , how you can make an active x control that you can include in a project.

It is limited. It does not scale its size, and I did not spend any time doing all the things that one normally does to package up a control. This is really just a quick hack. Feel free to improve it and pass it on to the class. To use: Unzip the file into a directory. Check out the test program in a sub directory that I included.

Navigate to the OCX file that will be in the unzipped directory and select it.