I assume you are running into a buffering issue, such that your program exits before your buffer flushes. When you use printf() or print() it doesn’t necessarily flush without a newline. You can use an explicit flush() or add a new-line (which will also cause a flush()) See also Buffered Streams – The Java Tutorials, Flushing Buffered Streams which says in part Some buffered … Read more
Sure. An iterator is just an implementation of the java.util.Iterator interface. If you’re using an existing iterable object (say, a LinkedList) from java.util, you’ll need to either subclass it and override its iterator function so that you return your own, or provide a means of wrapping a standard iterator in your special Iterator instance (which has the advantage of being more broadly used), … Read more
I know what you mean about the tutorials. Here’s how I do it: First you need to write your script. In your theme folder create a folder called something like ‘js’. Create a file in that folder for your javascript. E.g. your-script.js. Add your jQuery script to that file (you don’t need <script> tags in a .js … Read more
After type erasure, all that is known about T is that it is some subclass of Object. You need to specify some factory to create instances of T. One approach could use a Supplier<T>: Usage might look like this: Alternatively, you can provide a Class<T> object, and then use reflection.
If you want that for display purposes, use java.text.DecimalFormat: If you need it for calculations, use java.lang.Math:
this should be an internal file of JRE and in general you shouldn’t deal with it when you’re running/compiling java. Here you can find an explanation of what exactly this file is intended for. Bottom line, your Java installation is somehow corrupted, so as a first resort to resolve this issue, I suggest you to re-install … Read more
Usage depends on whether the component’s parent has a layout manager or not. setSize() — use when a parent layout manager does not exist; setPreferredSize() (also its related setMinimumSize and setMaximumSize) — use when a parent layout manager exists. The setSize() method probably won’t do anything if the component’s parent is using a layout manager; the places this will typically have an … Read more
I have to ask a question in return: is your GenSet “checked” or “unchecked”? What does that mean? Checked: strong typing. GenSet knows explicitly what type of objects it contains (i.e. its constructor was explicitly called with a Class<E> argument, and methods will throw an exception when they are passed arguments that are not of type E. See Collections.checkedCollection.-> in that case, you should … Read more
Like this: or (The latter syntax can be used in assignments other than at the point of the variable declaration, whereas the shorter syntax only works with declarations.)
You may use Graphics.drawPolygon(int[], int[], int) where the first int[] is the set of x values, the second int[] is the set of y values, and the int is the length of the array. (In a triangle’s case, the int is going to be 3) Example: Output: