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...
does bootstrap have a tree component? ...
has been working for 8 years, it is absolutely no problem to write business code in php, and I also know something about architecture. I know how to deal with high concurrency and database optimization, and there are some deficiencies in system tuning or...
in "JavaScript you don t know ", there is a paragraph about the inherited mixin implementation. The code is as follows: function mixin( sourceObj, targetObj ) { sourceObjtargetObjkey,targetObj for (var key in sourceObj) { if (!(key i...
my business scenario is: when it is determined that the web page is opened in Wechat, click the payment button to jump ( location.href ) to the Wechat authorization page to obtain code (silent form), then redirect to the payment page, and bring back code...
<a href="xx">< a> ...