包含标签：Java 的文章
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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…… -
What Java library should I use for image clipping / letterboxing?
I am looking for a Java library for image clipping / resizing I planned to use jmagick, but I haven't maintained it si…… -
RX Java – rxjava returns a single, which is completed after execution
I'm trying to do the following: return some data as a single, and then execute it after completion Due to single Andth…… -
Java – check that the ArrayList of strings is in alphabetical order
I have an ArrayList named account, which contains strings I'm trying to write a method to check whether they are order…… -
Java – linkedhashset as return type of API public method
Let's consider the following example Write an API with a public method that returns a collection of unique objects I t…… -
Java – how to create array objects when using parenthesis lists
I understand that when I call its constructor with the new keyword, an array object in Java will be created: int[] myI…… -
Java – is there a way to pass a string to a mutable method?
I know that string variables are immutable in Java by default But is there any way to set a string variable or make it…… -
The Java program accepts the date in any format as input and prints the month,
The Java program accepts the date in any format as input and prints the month, Is it possible I tried the following, a…… -
Java – does using volatile only make sense in multiprocessor systems?
Using volatile only makes sense in multiprocessor systems Is this wrong? I'm trying to learn thread programming, so if…… -
Why does the java compiler report only one error at a time?
I have a clip class T{ int y; public static void main(String... s){ int x; System.out.println(…… -
Java – double counting that produces odd results
See English answer > is floating point math broken? 28 Solution Oh, I like these... These are caused by inaccuracie…… -
Assigning objects in Java
I have this Code: this.elements = elements; Where the element is list Copy list or just pointer copy, both represent t…… -
Java coding practices, runtime exceptions, and this scenario
In the following scenario, I try to understand how to handle this code and its relationship with runtimexception As I'…… -
What is the priority of static blocks in Java?
public class Static public class Static { static { int x = 5; } static int x,y; public st…… -
Java – how do I find a value between two strings?
How do I "find" and "get" the value between two strings? Namely: < a > 3 < / a > I'm reading a file to fin…… -
Java – problems in instance variable initialization
Here are some sample code, class Base { private int val; Base() { val = lookup(); } public int lookup() { …… -
Java – how to get the availability details of a running instance
I am traversing the list of running instances returned by the describeinstances API I want to know how to retrieve the…… -
How to change the default Java icon in Jfilechooser
I want to change the built - in Java icon from Jfilechooser JFrame class has seticon image() method of set icon But I …… -
Write a Java class and create only five instances of it
I want to write a Java class that can only be instantiated five times, just like a singleton class with only one insta…… -
Java – slidingmenu width incorrect
I use jfeinstein1's slidingmenu library. In my project I want to slide the slide menu out to about 3 / 4 of the screen…… -
Java – why does a function not have a parameterized return type because it has parameterized input?
This always forces us to return one parameter in case I need to return multiple, such as a list and a string There is …… -
Java string to int
I have a string of about 150 numbers, such as string num = "64513246563....."; I'm trying to add every number of this …… -
Java – if (pause = = null) {does not work
When pause is null, I use if (pause = = null) to perform some operations But I made a mistake For parameter type long,…… -
How to use equalsignorecase() for multiple elements in Java
if(string.equalsIgnoreCase("first") || if(string.equalsIgnoreCase("first") || string.equalsIgnoreCase("second") || s…… -
Java – traverses the array in reverse without minus sign
I was asked this question in today's interview I'm sure it's a very simple technique, but I can't think of it How do I…… -
Java – sort a list of non comparable elements
Today, I was asked this interview question: I know I need to make the person class implement comparable and then overr…… -
Are there tools for documenting Java applications?
I wonder if there is a tool for recording Java applications I mean, if I want to specify in my code what each function…… -
How to set the first day of the week in a Java application calendar
We use a Java application that has a date selection field when you click there to open a small calendar The first day …… -
Java – strange null pointer exception: ternary conditional operators do not use string concatenation
StringBuffer sb=null; StringBuffer sb=null; // Some more logic that conditionally assigns value to the StringBuffer …… -
Java recursive insertion sort?
So I tried to turn the following code into a recursive method to insert sorting, but although I tried, I couldn't Who ……