URL is not hierarchical ...
String b = "abcd " String a = "a " String c = "bcd " String d=a+c system.out.println (dashed constants) false Why false should be true according to the principle that there is only one copy of the java string constant. what does the memory d...
the java interface should not be instantiated, so why make the program work properly in the following form? (the screenshot on the ebook, the program actually clicked, but I don t know why) ...
java rookie, read java Core Technology introduction Graphics2D class is a subclass of Graphics, in which there is a code public void paintComponent (Graphics g) { Graphics2D g2 = (Graphics2D) g ...... } will there be no error in the downward transitio...
objects are transmitted in binary mode on the network. so for serialization, different serialization, the transferred object should be a binary stream. then why json and xml are also described as serialization. It is not very clear that both of them ha...
< H2 > NewFile.java < H2 > private File configurationFile; public NewFile(File file){ this.configurationFile = file; } public void newFile() throws IOException{ if (!configurationFile.exists()) configurationFile.createNewFile(); ...
the first code can be locked successfully public class Main { public static void main(String[] args){ LockThread lock1 = new LockThread(true); LockThread lock2 = new LockThread(false); Thread thread1 = new Thread(lock1); Thread th...
but what if I call system.in.read () again after closing it? does its instance BufferedInputStream shut down automatically immediately after it is used up? Or are you waiting for recycling? ...
Student.java private int age; private String name; public Student(int age, String name){ this.name = name; this.age = age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setNam...
try { fetchJsonp("xxx.php", { headers: { Content-Type : application json }, jsonpCallbackFunction: portraitCallBack }) ; let dataS = promise.json(); console.log(dataS); dataS.then(data => { console.log(data...
I am embarrassed to say that I have written the address wrong, please ignore the following = it is clear that when a cross-domain PUT request is sent, an options pre-check request will be sent. However, options returns 404. Please take a look at ~ ...
problem description how to pass parameters when sharing with Wechat official account? the environmental background of the problems and what methods you have tried Wechat official account sharing function needs to be realized. Once the user shares,...
when the yii framework did the function of increasing the number of articles read today, it was found that the number of readings increased by 2 each visit. later found that whenever I render the template and layout in the controller, the controller i...
ask me, vue ie11 opens blank, what is the reason for the error? XMLHttpRequest: network error 0x2efd, this operation cannot be completed due to error 00002efd ...