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...
Why do I report an error when I write like this? I don t understand the code is as follows <table border=1> <?php for ($i = 1; $i < 10; $iPP) { ?> <tr> <?php for ($j = 1; $j < 10; $jPP) {?> <...
window uses select to verify socket reading and writing, but the set of r_list file descriptors returned by select seems to be unchanged. The code is as follows. Thank you related codes receiver: import select,socket sk=socket.socket() sk.bind((&qu...
the company project uses angularJS, and also uses some jquery plug-ins in the project, such as bootstrap table, which comes with ajax requests. Now the front end needs to act as an interceptor to handle http requests uniformly. Excuse me, how can we inte...
RT,es6 has a parent class inherited by extend, so why do you want to decorate (Decorator),? isn t it superfluous? ...
recently contacted WeChat Mini Programs developer, want to do a function Click the switch button to switch between showing and hiding the contents of the two view. I have tried many times but failed. Find a simple example ...