包含标签：Java 的文章
-
The try catch block cannot suppress Java lang.NullPointerException
I got Java Lang.nullpointerexception, I don't know why I tried to use the try catch block, but it didn't work Can anyo…… -
Java – the code is compiled in eclipse, but not from the command prompt
The following code has no problem compiling in eclipse using JDK7 (I use update 10, but it should be used with any ver…… -
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……