包含标签：Java 的文章
-
Java: why not declare static intead that passes references?
Suppose we want to make a game where you have to collect gems So we need a gem class, a gemspawner class and, of cours…… -
Java – convert from numeric string containing comma to int
I have such value: String x = "10,000"; I want to convert it to int. I can convert it by removing the following Comma:…… -
Java – multiple values of columns in the database
Whether multiple values can be stored in database columns If so, which type should I use? And how to insert values thr…… -
String literals and string objects in Java
In Java, string can be created in the following two ways >String foo = "test"; > String fooobj = new String(“Tes…… -
How to get the (n) index of characters in a string?
Suppose you have a string like this: String longStr="someText1@someText2@someText3@someText@someText4@someText5@someTe…… -
Changing colors using LinearLayout and textview in Java (Android)
I'm a relatively new Android Developer. I noticed that it seemed strange to me. I hope someone can explain I have Line…… -
Multithreading – thread safe deletion of linked list nodes using fine-grained methods
Why is it not thread safe to delete the following code snippet of a node in a linked list? Edit: note that each node h…… -
There are more than 1 commands in the Java 8 foreach function
Is it possible to import the map.xml in Java 8 Multiple commands used in foreach function? So instead of: map.forEach(…… -
How to select a random item from ArrayList in Java?
See English answers > randomly select an item from a list ArrayList<Integer> mylist= new ArrayList<Intege…… -
Java – ArrayList. Java that causes NullPointerException Add() method
The longinteger class causes the following error at runtime: Exception in thread "main" java.lang.NullPointerException…… -
Java in Java util. Map. Contains() method call
Is there any way to call java. in JSP? util. Map. Contains () method, where map is the attribute of the bean Solution …… -
Java – how to set text to an integer and get int without receiving an error
I'm trying to get intent from integers String fetch intent works normally and displays well, but when I put integers, …… -
Java – create treemap visualization
I want an algorithm for creating treemap visualization Like this: an easy way to make a treemap The problem is that I …… -
Why does the java compiler not shorten the name by default? (performance and confusion)
I can't understand why the java compiler doesn't shorten the names of variables, parameters and method names by replac…… -
Java – implement custom CompareTo
@Override @Override public int compareTo(Object t) { if(t instanceof Student) { Student s = (Student)…… -
Java – how to instantiate an object using its string
In Java, suppose I have a string variable: String x = "CoolClass"; I have a class called coolclass that has a working …… -
Property file string length limit (Java)
Playing with a properties file, I think it seems to have I do the following: File configFile = new File("config.proper…… -
Java – use sleep () for a single thread
I'm new to Java and started using different threads to use wait () or sleep () on part of my code and keep other threa…… -
How do I fill in an ArrayList for each loop? (JAVA)
I have to fill an ArrayList with the first 10 multiples of each loop I really can't seem to figure out how I can't use…… -
Java – how to use keylistener
I'm trying to implement a keylistener in my program so that when I press the arrow key, it will perform an action to m…… -
Java – how to allocate variables defined in if else statements
I need to create content that can find the current hour in GMT and convert it to EST When I try to compile and run the…… -
Is there any way to get the number of digits after the decimal point in Java double?
I am developing a Java / groovy program I have a double variable that contains a number entered by the user What I rea…… -
Java – is there a simple way to loop stdin in guava?
In Apache commons, I can write: LineIterator it = IoUtils.lineIterator(system.in,"utf-8"); while (it.hasNext()) { …… -
Java program organization: how to get rid of this large-scale case statement?
I'm creating a program that will fill in attributives Now I'm simulating "various words" like this: public class WordD…… -
Java: formatting strings as phone numbers
I have an unformatted phone number string ("5551234567") I want to format this string in the UI for display purposes A…… -
Java – in borderlayout Keep the size of JButton in center
Is there any way to keep the natural size of JButton in the center of borderlayout? Now, it expands in all directions …… -
How to smoothly scroll JFrame in Java
A JFrame in my java application contains a JPanel, and I create some drawing objects at runtime The problem is that wh…… -
Java – my syntax is wrong. Is it effective for me to do this?
I'm trying to make a way to tell me whether the weather is a number or a prime This is the code: class prime { pu…… -
Java – why shouldn’t we use the (default) SRC package?
I recently started using the eclipse IDE and have read in many places that I shouldn't use the default (SRC) package a…… -
Java – how to add an hour to my time
I have time in the following format and use this value to set the text of my button String strDateFormat = "HH:mm: a";…… -
Java – speedup HashSet and HashMap performance
In Java, I have: Set<Integer> set = new HashSet<Integer>(); callVoidMethod(set); ... public static void ca…… -
What is the easiest way for Java to assign default variable values with or?
I read data from a CSV file and want to assign column values to variables There may be cases where the file does not c……