Quite a few problems with your code: On Arrays.asList returning a fixed-size list From the API: Arrays.asList: Returns a fixed-size list backed by the specified array. You can’t add to it; you can’t remove from it. You can’t structurally modify the List. Fix Create a LinkedList, which supports faster remove. List<String> list = new LinkedList<String>(Arrays.asList(split)); … Read more
Referring to Ask Ubuntu question How to set JAVA_HOME for OpenJDK?, How to install Open JDK (Java developement kit) in Ubuntu (Linux)? Open Terminal from Application Dash or press Ctrl+Alt+T Update repository: sudo add-apt-repository ppa:openjdk-r/ppa # only Ubuntu 17.4 and earlier sudo apt update Optional: To search available distributions of openjdk, use the following command: … Read more
Summary In Java 6 (and presumably earlier), round(x) is implemented as floor(x+0.5).1 This is a specification bug, for precisely this one pathological case.2 Java 7 no longer mandates this broken implementation.3 The problem 0.5+0.49999999999999994 is exactly 1 in double precision: static void print(double d) { System.out.printf(“%016x\n”, Double.doubleToLongBits(d)); } public static void main(String args[]) { double … Read more
In addition to the already mentioned <pre> tags, you should also use the @code JavaDoc annotation, which will make life much easier when it comes to HTML entities issues (in particular with Generics), e.g.: * <pre> * {@code * Set<String> s; * System.out.println(s); * } * </pre> Will give correct HTML output: Set<String> s; System.out.println(s); … Read more
if (obj instanceof C) { //your code }
Below are some reasons arguing for the use of the pattern and example code in Java, but it is an implementation of the Builder Pattern covered by the Gang of Four in Design Patterns. The reasons you would use it in Java are also applicable to other programming languages as well. As Joshua Bloch states … Read more
NOTE: This answer applies to Java 14 and older. Text blocks (multiline literals) were introduced in Java 15. See this answer for details. It sounds like you want to do a multiline literal, which does not exist in Java. Your best alternative is going to be strings that are just +‘d together. Some other options … Read more
You’ll need to do one of the following. If it’s your code, then define your own functional interface that declares the checked exception: @FunctionalInterface public interface CheckedFunction<T, R> { R apply(T t) throws IOException; } and use it: void foo (CheckedFunction f) { … } Otherwise, wrap Integer myMethod(String s) in a method that doesn’t … Read more
Commons Lang has it. Or you could throw an UnsupportedOperationException.
The basic problem is, that you have to wait for the drawing phase for the actual measurements (especially with dynamic values like wrap_content or match_parent), but usually this phase hasn’t been finished up to onResume(). So you need a workaround for waiting for this phase. There a are different possible solutions to this: 1. Listen … Read more