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What are invalid characters in XML
...n issue where 0x1c is an illegal character... Looking for a possibility in java how to avoid these....
– basZero
Dec 10 '13 at 9:20
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Language Books/Tutorials for popular languages
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Effective Java is a must but I recommend being comfortable with Java first to fully understand the examples.
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What would be C++ limitations compared C language? [closed]
...of a queue in C is dafter than suggesting 'use objective C' and 'call the Java java.util.Queue class using JNI' or 'call the CPython library' - Objective C actually is a proper superset of C (including C99), and Java and CPython libraries both are callable directly from C without having to port unr...
Proper usage of Optional.ifPresent()
... am trying to understand the ifPresent() method of the Optional API in Java 8.
5 Answers
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Is there a way to get the source code from an APK file?
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Simple way: use online tool http://www.javadecompilers.com/apk, upload apk and get source code.
Procedure for decoding .apk files, step-by-step method:
Step 1:
Make a new folder and copy over the .apk file that you want to decode.
Now rename the extension of th...
How to instantiate non static inner class within a static method?
...de-notes, but I don't find them responsive to the actual question.
import java.awt.Graphics;
import java.awt.Color;
import javax.swing.JPanel;
import javax.swing.JFrame;
public class Example {
public class InnerClass extends JPanel {
public void paint(Graphics g) {
g.setCol...
StringUtils 字符串工具扩展：强大的文本处理工具集 · App Inventor 2 中文网
...Version
返回扩展的版本号。
SDK版本 VersionSDK
返回当前运行的 Android API 级别。
方法 Methods
字符和大小写检测
获取字符 CharAt(索引)
返回指定位置的字符（1-based 索引）。
返回...
Best practice to run Linux service as a different user
... ("sudo: sorry, you must have a tty to run sudo")
If you are daemonizing a java application, you might want to consider Java Service Wrapper (which provides a mechanism for setting the user id)
Another alternative could be su --session-command=[cmd] [user]
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How to extract epoch from LocalDate and LocalDateTime?
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Convert from human readable date to epoch:
long epoch = new java.text.SimpleDateFormat("MM/dd/yyyyHH:mm:ss").parse("01/01/1970 01:00:00").getTime() / 1000;
Convert from epoch to human readable date:
String date = new java.text.SimpleDateFormat("MM/dd/yyyyHH:mm:ss").format(new java....
Multi-gradient shapes
...works, haha. Right now it works in XML, but should be doable for shapes in Java as well. It's kind of complex, and I imagine there's a way to simplify it into a single shape, but this is what I've got for now:
green_horizontal_gradient.xml
<?xml version="1.0" encoding="utf-8"?>
<shape
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