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default copy constructor15. What is a depth copy?A shallow copy is the creation of an object that initializes it with a ready-made object simply by copying the member (simple assignment) without copying the resources assigned to the member (such as assigning dynamic memory to its pointer variable members); Deep copy is when an object is created, if the resource is allocated, you need to define your own copy constructor. So that not only copy members but also copy the resources assigned to it.16

() obj.out () output result: OutoutStatic methods allow us to execute methods in a class without having to create an object.V. Types of methodsA class method is a way to manipulate the class itself as an object. The difference between him and the static method is that whether this is called from an instance or from a class, it uses the first parameter to pass the class over . classFoo:annimal='Cat' def __init__(self):Pass defShow (self):Print('SH') #Decorator , using this adorner to de

variables in the classThe name of the class. Already has a variable name #查询变量名对应的内容The class name. New variable name = variable content #增加一个变量The class name. Existing variable name-new variable content #对类中已有的变量名对应的变量内容进行修改Del class name. already has a variable name #对类中的变量惊醒删除操作3. Class names Call methods (functions) in a classClass name. Method Name () #此处调用方法 (function) need to pass arguments to the function2. At the angle of the objectThis process of the class name + (): The process of in

is used for medium-sized and large-scale data applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors.41. In Java, when can objects be garbage collected?This object can be recycled when the object becomes inaccessible to applications that currently use the object.Is there a garbage collection in the permanent generation of 42.JVM?Garbage collection does not occur in a permanent generation, and if it is permanently ful

{returnInput +2 }//What is the curry?//currying refers to the transformation from a multi-parameter function into a series of single-parameter functions.Func Add (Input:int), (INT)Int {return{Valueinch returnInput +Value}} Let AddTwo= Add (Input:2) Let Oupput= AddTwo (8) print (oupput)classBankcard {//Balancevar balance:double =0.0 //How to save moneyfunc Deposit (amount:double) {balance+=Amount Print ("deposit:\ (balance)") } }//Curry?Let card =Bankcard (

to more of the differences.HashSet in 47.Java, how does the interior work? (Answer answer)The interior of the HashSet is implemented using HashMap. Since the MAP requires key and value, all keys have a default value. Similar to Hashmap,hashset does not allow duplicate keys, only a null key is allowed, meaning that only one null object is allowed in HashSet.48. Write a piece of code to remove an element while traversing ArrayList? AnswerThe key to the problem is whether the interviewer is using

know where this erroneous thinking from.16.public interface Set Look at the document.22. "An abstract class can inherit an entity class, but only if the entity class must have a clear constructor." "What do you mean, who rules?"27. This is more complex, such aspublic class Main {public static void Main (string[] args) {SYSTEM.OUT.PRINTLN (Test ());}public static Boolean test () {Boolean B = false;try {return B = 4 > 3;} finally {System.out.println (b);return false;}}}As can be seen in this exam

("Beware of bombs"); J.setdefaultcloseoperation (Jframe.exit_on_close); final JLabel lbl = new JLabel ("Time", Jlabel.center); New content, fill text "Time"//text position centered font font = new Font ("Microsoft Jas Black", Font.plain, 60); Format font, bold, etc., size lbl.setfont (font); text box call font format j.setlayout (null); After opening the layout manager bounds can use Lbl.setbounds (100, 100, 300, 100); Lbl.settext (C.tostring ()) is available at location after the text box posi

similarities and differences between synchronized and java.util.concurrent.locks.Lock ? Main similarities: Lock can complete all functions implemented by synchronizedMain differences: Lock has more precise line semantics and better performance than synchronized. The synchronized automatically releases the lock, and lock must require the programmer to release it manually, and must be released in the finally clause. Lock also has a more powerful function, for example, its Trylock method can be no

(".. /", Dismatchlen). Implode ("/", $arrLeft);return $ret;}Print_r (Sgetrelativepath (b,a)); 3. Write a function that can traverse all the files and subfolders under a folder. function Agetallfile ($folder){$AFILEARR = Array ();if (Is_dir ($folder)){Handle=opendir (folder);while ((File=readdir (handle))!== false){If it is. Or. Then skipif (file== "." | | File = = ".."){Continue}if (Is_file (folder. " /". File)){Afilearr[]=file;}else if (Is_dir (folder. /". File)){Afilearr[file] = age

Just study the dynamic Network Forum code, found a page hint Mark i feel very magical, see a half-day to understand the original is called "webdings" font, in fact very simple, only need 0 1 2 3 4 5 6 7 8 9 a B c D e F g h i j k l m n o p q R S t u v w x y z a b c d e F g h i j k l m n o p q r S T U V W X Y Z,. /' [] \ \ =-Each of the above graphs corresponds to one character, and the font is Webdings0 1 2 3 4 5 6 7 8 9 a B c D e F g h i j k l m n o p q R S t u v w x y z a b c d e F g h i j k l

errors encountered in PHP. Tip : It's all very normal information, not a big mistake, and some won't even show it to the user. For example, access to non-existent variables. warning : This is a bit of a serious error that will present the warning message to the user, but will not affect the output of the code, such as containing some files that do not exist. Error : This is a real serious error, such as accessing a nonexistent PHP class. Question: How do I define Constants in P

not speak here):1 r = Filter (lambda u:a.index (u)% 2 = = 1, a) # in order to get the index value of the element in the list,Call List.index (). 2 print (list (r)) # results are: [5, 9, 12]　Once you have the element in the even position, use the map function to add 3 to each element:1 s = map (Lambda y:y+3, List (R))2print(list (s)) # results are: [8, 12, 15 ]　　So we add 3 to the element of the dual position, and here the SUM function is the simplest, and finally the co

("Pthread_mutex_unlock Error errmsg[%s]\n", Strerror (errno)); Exit (0); } //if (Pthread_cond_broadcast (cond_a)) if(Pthread_cond_signal (cond_a)) {printf ("pthread_cond_broadcast Error errmsg[%s]\n", Strerror (errno)); Exit (0); }} printf ("\ n"); Pthread_exit (NULL);}intAppinit () {G_flag=0; Pthread_mutex_init (Mylock, NULL); Pthread_cond_init (cond_a, NULL); return 0; }intAppdone () {Pthread_cond_destroy (cond_a); Pthread_mutex_destroy (Mylock); return 0;}intMainintargcChar*arg

longer needed, but because long-life-cycle objects hold their references and cannot be recycled, this is where memory leaks occur in Java, in layman's words, Is that the programmer might have created an object that would never be used in the future, and this object has been referenced, that is, the object is useless but cannot be reclaimed by the garbage collector, which is a possible memory leak in Java, for example, the cache system, we loaded an object in the cache ( For example, in a global

method of storing elements. The Map collection class is used to store element pairs (called "Keys" and "values"), where each key is mapped to a value.They all have the method of increasing the pruning and checking.For set, the approximate method is Add,remove, contains, etc.For map, the approximate method is put,remove,contains, etc.The list class will have a method such as get (int index), because it can take elements sequentially, and the set class does not have a method such as get (int inde

Indexing principleFull-Text search technology has a long history, the vast majority are based on inverted index to do, there have been some other programs such as file fingerprints. Inverted index, as the name implies, it is the opposite of an article contains what words, it starts from the word, it records the word in which documents appear, consisting of two parts-dictionary and inverted list.The dictionary structure is particularly important, there are many kinds of dictionary structure, each

(XXX), time does not need too much, 100 milliseconds almost, and then get Lock2 object lock. This is done primarily to prevent thread 1 from starting all at once to obtain an object lock for the Lock1 and Lock2 two objects in a row(3) thread 2 Run) (method in the synchronous code block first get Lock2 object lock, and then get Lock1 object Lock, of course, then Lock1 object lock has been held by thread 1 lock, thread 2 must be waiting for thread 1 to release Lock1 object lockIn this way, the th

In the interview process of the Python-related position, the list of lists will be inspected. (Note that it is sometimes required to ensure that the order of the heavy )1. Intuitive method1 li=[1,2,3,4,5,1,2,3]2 new_li=[]3 for in Li: 4 if not in new_li:5 new_ Li.append (i)6print(new_li)First create a new empty list, by traversing the original list, and then using the logical relationship not in to come and go heavy.Summary: This can be done, but the process is not simple enough. Howe

webservice是什么？ 　　1.基于WEB的服务，服务端整出一些资源让客户端应用访问（提供数据） 　　2.webservice是一个跨语言跨平台的规范（抽象） 　　3.是多个跨语言跨平台的应用间通信整合的方案（实际）webservice相当于什么？ 　　http + xml + schema如何发布一个webservice 　　1.定义SEI（接口） @webservice（类） @webMethod（暴露的方法） 　　2.定义SEI的实现 　　 3.发布Endpoint.publish(url,new SEI的实现对象)如何请求一个webservice 　　1.根据wsdl文档生成客户端代码 jdk wsimport -keep wsdl路径 cxf wsdl2java wsdl路径 　　 2.根据生成的代码调用webservice 找到wsdl文档中service标签的name属性对应的类，找到这个port标签的name属性 调用这个方法wsdl（WebService Definition Language）是什么？ 　　1.webservice定义语言，对应