包含标签：Java 的文章
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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 …… -
Java – why doesn’t my JFrame display?
I'm trying to display a solved Sudoku puzzle in a window with 81 boxes I did this: import java.awt.GridLayout; import …… -
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 …… -
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Java – reproduce simpledateformat non thread safety in testing
I have an application that has this stack trace in the log from time to time: java.lang.Arrayindexoutofboundsexception…… -
Java – an alternative method to compare three ints for equality
int a = 10; int a = 10; int b = 10; int c = 10; I tried to find out if there was an alternative way to compare three i…… -
java – fragment_ display_ Message: My First Android application error
This is my first time developing mobile applications Environment: Eclipse Kepler, Java 1.7 backend: I follow these ste…… -
Java – cannot convert generic set?
I have an interesting problem today Consider the following code public static class Parent {} public static class Chil…… -
Java – good UI Design: how to handle empty listview?
My application connects to the network and populates listview Sometimes nothing is returned What is the best way to no…… -
Java – learn about ArrayList indexoutofboundsexception in Android
I get a lot of indexoutofboundseception from any ArrayList I use Most of the time it works, but sometimes I encounter …… -
Java – can any unused object escape from the garbage collector?
Are there any objects that may not be referenced anywhere and still exist on the heap I mean, an unused object may esc…… -
Java – JSTL and time zone
I have some questions about the time zone We store all dates in UTC time, but we need to display some of them both in …… -
Java code optimization, it will optimize this
For newer compilers, I find myself trying to write more readable code, but if the optimization I want to do under the …… -
Java – Android: how do I get two digits after a decimal value? Do not want to truncate the value
How to get a double precision value with only two digits after the decimal point For example, if a = 190253 8084615384…… -
Java exception handling?
The following code calculates the average of the numbers stored in the text file Solution If necessary, you can use Ja…… -
Java – how to operate on large numbers that cannot be stored in a variable
In Java, I want to be able to operate on very large integers (which cannot be stored for a long time). What should I d…… -
Java – use check boxes to wrap text in a text area
I created a dialog box for editing data in swing It contains a jtextarea, two JButton instances (OK & cancel) and …… -
java. lang.OutOfMemoryError：
I'm trying to create a video file from the bytes retrieved from the database The plan worked well a few hours ago Afte…… -
Java – intelligent garbage collection?
You simply call system GC () can do garbage collection in Java, but sometimes this "delays" the application Collecting…… -
Java – can each thread have a unique static variable?
I have a static variable and I want each thread to be unique Is this the case with all static variables? Or there is n…… -
Java – enabling websecurityconfigurer via @ profile does not work
I think I have a very simple and basic setup for running spring boot webapp with some authentication locally I hope th…… -
What is the best way to use hibernate’s detachedcriteria to limit results in Java?
I use hibernate 3.5.0 in Java 6-Final. Because I can't access hibernate session, I use detachedcriteria So, I want to …… -
Get the certificate and add it to the Java trust store, only HTTPS URL?
I'm trying to send push notifications to Android devices through Google cloud messaging server The URL we use is: http……