包含标签：Java 的文章
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Why does the Java ArrayList class return a Boolean value to add?
My teacher gave me this analogy to the method I was writing I still don't understand why the add method returns a Bool…… -
Default initialization of private fields in Java
Suppose I have a class named person: class Person{ private int num = 1; } When calling an empty constructor for th…… -
Java – what’s faster – storing data in lists or databases? (robot)
I am currently working on a school project (Android application). We should store user fee and income information in t…… -
Java EE App Server Hello World
I am very familiar with individual Java application development, but I will soon use Java EE application server develo…… -
How to create a random number with a combination of 5 digits and charter flights
I want to generate such a random number > ADF1845CFT > ADF1864ATY > ADF18AT65Y I successfully created a 5-dig…… -
Java – meaning of API
Anyone can tell me the meaning of API in the following paragraph, which is actually about transfer object: Thank you i…… -
Java-8 – Java 8: filtering and mapping on the same method output
We try to refactor the following code into Java 8: List<String> list = new ArrayList<>(); Iterator<Obj&…… -
Java – sort objects by multiple attributes
I've been studying things that require me to classify objects (soft drinks) according to three attributes - Software (…… -
Java – how do I know how many objects will be created using the following code?
For strings, I'm a little confused about the object situation, so I want to know how many objects will be created with…… -
Java – mockito’s spy object in spring
When I try to snoop on objects in unit tests, @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations …… -
Vector – gets the array value from the index set
I am looking for a generalization of the nth function Clojure remove item from vector at a specified location Solution…… -
Java – applet – how do I use this code using strings instead of characters?
I'm slowly trying to write a program that converts hexadecimal numbers to decimal numbers I'm not interested in readin…… -
Java – how do I pass parameters to a thread and get the return value?
public class CalculationThread implements Runnable { public class CalculationThread implements Runnable { int inp…… -
Java – wicket – which ORM?
I am looking for an ORM that is easy to use and integrated for wicket applications I'm thinking about hibernate Is thi…… -
Java – variables are instantiated in kotlin only when kotlin is empty?
It can be said that I have a variable: var myObject：MyObject？ = null It should be cleared somewhere: myObject?.clear…… -
Java – how to prevent HashMap or treemap from replacing previous values
If it already exists, how can I prevent HashMap or treemap from replacing the previous key value? In addition, I want …… -
How to create an autocomplete pop-up window in jtextpane in Java?
I am creating an SQL editor I am using jtextpane as the editor I want to implement autocompletion for table names such…… -
Java encodes the file as a Base64 string to match other encoded strings
private static String encodeFileToBase64Binary(String fileName) private static String encodeFileToBase64Binary(String …… -
Incredible little decimal best Java object
What Java object is best for storing tiny decimal values, such as 10 ^ - 25? When using minimum space, which object ho…… -
Java – is there any way to test 2-way SSL through the browser?
If so, how to set the authentication certificate and what files do you need? Yes pfx？ How would you install it in you…… -
Java – a faster way to find the key for a given value from the map?
I want to find the key of a given value from HashMap. At present, I have to pass all keys and check its value in the m…… -
Java – fast string search, such as startswith() is not equal to ()
I have a sequence list (a dictionary – 100k words) and many words are often searched in this list Therefore, performan…… -
Why is the string method substring () not in camelCase in Java?
According to Java standards, we should follow camelCase But why is the string method substring () not in camelCase? Is…… -
Print a list in Java?
I want to print a list in Java @H_ 301_ 8@ @H_ 301_ 8@ r1 r2 r3 r4 This is the code: @ h_ 301_ 8@ @H_ 301_ 8@ public s…… -
Java – what is the best remote technology for mobile applications?
I have a Java backend that needs to expose services to clients running in the following environments: > J2ME > W…… -
Being confused by Java generics requires a cast
I'm confused about the following code: import java.util.ArrayList; import java.util.LinkedList; import java.util.List;…… -
Java – ArrayList and indexof problems of my objects
I have an ArrayList problem with Java I created an object that contains two attributes X and Y. now I loaded some obje…… -
Java: how to create a loop to create an array?
I need a lot of arrays, now I create them manually: int[] row1 = new int[3]; int[] row2 = new int[3]; int[] row3 = new…… -
Java – wicket – which ORM?
I am looking for an ORM that is easy to use and integrated for wicket applications I'm thinking about hibernate Is thi…… -
Java – find element or check if it exists in array / list?
I'm a novice. I really don't understand how this works I made a list of room information: List<Room> rooms = new…… -
Java – the question I tripped over in the interview
I was asked several Java interview questions. I don't know how to solve them. I can use some answers >Write a metho…… -
Can Java constructors construct subclass objects?
Is there any way to modify the class constructed in the constructor? public class A { A() { //if (condition) ret……