Java
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Where can I find Java main functions
Is public static void main (string [] args) a built-in or user-defined or overridden function of some classes provided…… -
Java – how to avoid instanceof calls?
I defined this simple method: public static boolean isBorder(int x,int y) throws CollisionDetectionException { …… -
Java – what is system in
Consider this scanner input example Scanner user_input = new Scanner( system.in ); The scanner is class user_ Input is…… -
Java string Split() deletes trailing empty entries
I'm trying to parse some pipe delimited records I have this Code: public class Test { public static void main(Stri…… -
Inconsistent Java performance
I have an interpreter written in Java I tried to test the performance results of various optimizations in the interpre…… -
Can Java 10 compiled classes run on 9?
See the English answer > can Java 8 code be compiled to run on Java 7 JVM? 5 Is my hypothesis correct? Solution Thi…… -
How to use file. XML in Java Mkdirs () writes elegant code?
I need a directory to save the file, but I'm not sure if it exists File saveDir = new File("/tmp/appname/savedir/"); i…… -
How do I embed java code in JSF pages?
I have: In this JSF page, I have a login form Inside the managebean, I have a logincheck function public void loginChe…… -
Java – optimal solution of maximum single sales profit algorithm
The input array is: A[0] = 23171 A[1] = 21015 A[2] = 21123 A[3] = 21366 A[4] = 21013 A[5] = 21367 The mission is t…… -
Java generic problem
Can I write a method that can create an instance of any specified type? I think Java generics should help, so it might…… -
Java 8 avoids a large number of if / else statements
I have something that looks like this: public boolean isValidObject(SomeObject obj){ if(obj.getField() == null){ …… -
Use AutoCAD Library in Java to read DWG file?
Are there any open source Java or JavaScript libraries available for parsing DWG file and get objects from it I want t…… -
Java for loop problem
I'm making a java program to calculate Simpson's integral rules This is my code Note the second column of numbers in t…… -
C command line strings like Java?
Is there any way to get the C string from the command line, just like in Java? public static void main(String[] args) …… -
Deprecated in Java 1.6
In Java 1.5, to discard a method, you will: @Deprecated int foo(int bar) { } Compiling in Java 1.6 results in the foll…… -
Java – a simple leap year logic problem
public class LeapYear { public class LeapYear { public static void main(String[] args) { int year = Int…… -
Java – how to print arrays easily?
See English answer > What's the simple way to print a Java array? 32 System.out.print("["); for(int i = 0; i < a…… -
Java – reverse loop for array countdown
I received an error Exception in thread "main" java.lang.Arrayindexoutofboundsexception: 10 at Reverse.main(Revers…… -
Check the existence of Java in the file
I want to create a text file, but if the file already exists, I should not create a new file, but attach the text to t…… -
Java – load the keystore on OSX lion from the file created using keytool
I have a keystore whose key pairs are generated by the following command: keytool -genkeypair -v -alias test-agent -ke…… -
How to generate random numbers using Java in a given number list
Suppose I have a number / vector number, such as 1,3,7,9, and then I need to guess the number in this list at random U…… -
Java – business logic of the client
Why do people say that business logic should be implemented on server-side code (such as EJB) rather than on client-si…… -
Why does BigInteger’s stackoverflowerror in Java end up as an integer in the 19635th Fibonacci sequence
I use the following code to calculate the Fibonacci sequence to any large number The code worked as expected until I a…… -
Java – find the largest palindrome made by the product of two 3-digit numbers
package testing.project; package testing.project; public class palindromeThreeDigits { public static void main(S…… -
Java – when comparing two equal integers in a while loop, does the equal operator fail?
I post two examples below Example 1: Integer myVar1 = 42985; Integer myVar2 = 1; while (true) { if (myVar2 …… -
Java regular expression performance
I'm trying to parse links with regular expressions in Java But I think it's getting too slow For example, to extract a…… -
Suspend and resume the main thread in C for windows
I need to be able to pause and resume the main thread in Windows C applications I used it handle = GetCurrentThread();…… -
Java – button with rounded corners in Android
I want to create buttons such as the register and login buttons >Using shape drawable The results so far are not sa…… -
How to map a vector to a map and push duplicate key values into it?
This is my input data: [[:a 1 2] [:a 3 4] [:a 5 6] [:b \a \b] [:b \c \d] [:b \e \f]] I want to map this to the followi…… -
Java – it is not a good practice to use arrays as parameters to return multiple values
I sometimes (actually, often) find myself using a single element array to return multiple values from a method Somethi…… -
How do we divide integers into vectors in r that make up numbers
I think an example should make things clear I have I would like some_ 1 to the following a_ Function of 2 Solution Con…… -
How to use java to move the mouse smoothly across the screen?
There is a MouseMove () method that causes the pointer to jump to that position I want to be able to move the mouse sm……