JAVA invalid maximum heap size. The specified size exceeds the maximum representable size
I have to run this command to fix the code to a xml file: But it gives me this error: How can I make it work?
java
Understanding regex in Java: split(“\t”) vs split(“\\t”) – when do they both work, and when should they be used
When using “\t”, the escape sequence \t is replaced by Java with the character U+0009. When using “\\t”, the escape sequence \\ in \\t is replaced by Java with \, resulting in \t that is then interpreted by the regular expression parser as the character U+0009. So both notations will be interpreted correctly. It’s just the question when it is replaced with the corresponding character.
Java Round up Any Number
Math.ceil() is the correct function to call. I’m guessing a is an int, which would make a / 100 perform integer arithmetic. Try Math.ceil(a / 100.0) instead. Outputs:
C# Java HashMap equivalent
Dictionary is probably the closest. System.Collections.Generic.Dictionary implements the System.Collections.Generic.IDictionary interface (which is similar to Java’s Map interface). Some notable differences that you should be aware of: Adding/Getting items Java’s HashMap has the put and get methods for setting/getting items myMap.put(key, value) MyObject value = myMap.get(key) C#’s Dictionary uses [] indexing for setting/getting items myDictionary[key] = value MyObject value = myDictionary[key] null keys Java’s HashMap allows null keys .NET’s Dictionary throws an ArgumentNullException if you try … Read more
Round a double to 2 decimal places [duplicate]
Here’s an utility that rounds (instead of truncating) a double to specified number of decimal places. For example:
Round a double to 2 decimal places [duplicate]
Here’s an utility that rounds (instead of truncating) a double to specified number of decimal places. For example: Original version; watch out with this This breaks down badly in corner cases with either a very high number of decimal places (e.g. round(1000.0d, 17)) or large integer part (e.g. round(90080070060.1d, 9)). Thanks to Sloin for pointing this out. I’ve been using the above to round … Read more
Error when checking Java version: could not find java.dll
Reinstall JDK and set system variable JAVA_HOME on your JDK. (e.g. C:\tools\jdk7)And add JAVA_HOME variable to your PATH system variable Type in command line and To verify whether your installation was done successfully.
“Missing return statement” within if / for / while
If you put a return statement in the if, while or for statement then it may or may not return a value. If it will not go inside these statements then also that method should return some value (that could be null). To ensure that, compiler will force you to write this return statement which is after if, while or for. But if you … Read more
Non-static variable cannot be referenced from a static context
You must understand the difference between a class and an instance of that class. If you see a car on the street, you know immediately that it’s a car even if you can’t see which model or type. This is because you compare what you see with the class “car”. The class contains which is similar to … Read more
The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path
Add a runtime first and select project properties. Then check the server name from the ‘Runtimes’ tab as shown in the image.