Java
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Java – find the nth prime
I wrote the following code to find the nth prime Can this improve time complexity? Description: ArrayList arr stores c…… -
java. Lang.illegalstateexception: unable to retrieve entitymanagerfactory of unitname crudpu
I need to test for my new job, but it seems that I'm in a coma JDBC / crudds has been configured on the server, Ping s…… -
Java – disable the open button in Jfilechooser?
I extended a Jfilechooser and overridden the approveselection method so that when the user selects an invalid director…… -
macos – 10.8. Java Web Start and native (Apple) Java 1.6 in 2 cannot find JRE
I'm trying to run some on the latest OS - X JNLP application (game) When doing so, Java Web start App suggests that I …… -
Java cannot reference non final variables
Continue to give me the following code: package com.gwt.churchweb.churchweblogin.client; import com.google.gwt.user.c…… -
Java – generics – cannot be added to a list with unbounded wildcards
I instantiate the following list: // I am just revising generics again and the following is just cursory code! List<…… -
Java – NetBeans do not recognize arrayutil
I am using the following statement int[] numList = ArrayUtil.randomIntArray(100,100); I have imported it import java.u…… -
Simplify this generic method to join Java arrays
My goal is to implement a method that connects any number of arrays to a single array of their common supertypes and r…… -
Java – reasoning of object-oriented access specifiers
I have a general question about the reasons for object - oriented access specifiers I never fully understand why they …… -
java – Camera. Parameters device specific crash (Samsung S3 mini)
The following code is using Galaxy nexus, Samsung S3 and HTC one X, but it crashes on Samsung S3 Mini @Override public…… -
Java – retrieve words from strings
I have this line: (ADDRESS = (PROTOCOL = XXX)(HOST = YYY)(PORT = ZZZ)) I need to retrieve the host name, in this case …… -
Java – Convert byte array to double array
I encountered some problems with WAV files in Java WAV format: PCM_ Signed 44100.0 Hz, 24 bit, stereo, 6 bytes / frame…… -
How to compare two string arrays without Java utils
Check whether array Arr1 contains the same elements as arr2 in the same order in Java For example: isTheSame({"1","2",…… -
How to select random numbers in a range, but weight them to a part of the range? (in Java)
I want to choose a random number from a series of numbers, but I want to weight part of the range For example: >Sel…… -
Java – split the file into four parts
I want to divide a file (suppose an MP3) into four parts I tried this code But only file1 Mp3 works normally I can't p…… -
Java – even if we have a constructor, how do we initialize variables to default values
I have a question about the default constructor in Java Suppose I have two files, a.java public class a { int x; …… -
How to advance the modification date by 6 months in Java
See the English answer > java: Customize adding 1 month to the current date This is my output: Current date: Januar…… -
Java – if there is a statement with \ u0026 \ u0026, the first condition needs to be true before testing the second
See English answer > @ L_ 301_ 0 @ 9 From my test, it seems that the if statement will exit [10] before trying to g…… -
Java – AccountManager: invalideauthttoken does not invalidate the token
I tried to get a brand new token from the Google account stored in the Android device, but all the tokens I got were o…… -
Java – why can’t Android os. build. Version resolves to a variable?
I received an error: "android.os.build.version cannot be resolved to a variable" as attached to the line "int myversio…… -
Different icon sizes of the operating system in Java
I just realized that different versions of windows use icons of different sizes for different purposes For example, th…… -
JPA – SQL query using Union and select constants equivalent to SQL query
I wrote an SQL query that basically selects from many tables to determine which tables have rows created since a speci…… -
Rescale vector R
Suppose I have an integer vector, for example: > x [1] 1 1 1 4 4 13 13 14 I'm looking for an effective way to …… -
Java – an example of barrier decomposition
I'm reading the Book Java concurrency in practice, Can someone give an example of how it decomposes the problem into m…… -
Java – use generics to return multiple types
I have this method – public List<Apples> returnFruits(String arg1){ List<Apples> fruits = new ArrayList<…… -
Java Swing: add jlabel to JPanel
I just want to add jlabel to the existing JPanel It looks simple. I searched everywhere I think this is right, but the…… -
Java – when using “. Get (0)” in an empty list, I get an out of bounds exception instead of null?
So in my homework, for my error checking test, I made a list < someobject > and I got an indexoutofboundsexcepti…… -
Java – the program does not display the desired string representation of the object
I created a program in Java that should return all orders to the provider This is the procedure: package sakila.ui; i…… -
Java – if you use the Boolean Android statement
I've encountered Boolean problems in if statements all day. Now I'm really bothering me! I've seen other Android threa…… -
Java – displays the password in jpasswordfield instead of setting 0 to echo char
How do I display the text of jpasswordfield instead of setting 0 to echo char? Java docs says: The following results i…… -
Enumerating Java byte types in constructors
public enum Rank { public enum Rank { TEN("Ten",1),NINE("Nine",2),EIGHT("Eight",0),SEVEN("Seven",0); private……