java se 8 programmer

|0086): This can be +86 or 0086.2. String is a regular correlation API2.1. Matches methodThe parameters of the matches () method require that we pass in a regular expression that is described by a string, and then use the string formatting rules described by the regular expression to match the current string, if satisfied then the method returns True. Otherwise, false is returned.For example:String emailRegEx ="^[a-zA-Z0-9_.-][emailprotected]([a-zA-Z0-9-]+\\.)+[a-zA-Z0-9]{2,4}$";String email ="[

"Stop in Main" check box. If selected, when debugging a Java program based on the main method, the program stops executing at the first line of the Main method.7. Environment variablesInstead of adding environment variables to System properties, we can easily add them in the Edit Configuration dialog box.8.Drop to FrameThis is one of my favorite features. During debugging, you can jump back to the beginnin

box. -Tf.addkeylistener (NewKeyadapter () { the @Override + Public voidkeypressed (KeyEvent e) { A if(E.iscontroldown () e.getkeycode () = =keyevent.vk_enter) { theSystem.out.println ("Enter run ..."); + } - } $ }); $ -F.addwindowlistener (NewWindowadapter () { - @Override the Public voidwindowclosing (windowevent e) { -System.exit (0);Wuyi } the }); - Wu //add a mouse listener on the b

};for (int i=0; ipublic class Maopaosort{public static void Main (String args[]) {int [] a =new int{1,2,6,3,9,5,8,4,7};for (int i=0; iin fact, the two sorting methods are very similar, but in the order of the time when the comparison is not the same, this is the interview when the most frequently tested two sorts. 2. Find1. Two points Searchpublic class Halfselect{public static void Main (String args[]) {int [] a = {1,2,6,9,11,55,63,88};int min, max, mid;min = 0m Ax = Aa.length-1;mid = (min + ma

) Execution process:A: Calculate the value of an expression firstB: Match each case, and if there is one, execute the corresponding statement body and see the break end.C: If there is no match, execute the default statement body n+1.(4) Precautions:A:case can only be constants, cannot be variables, and values after multiple case cannot appear the sameCan B:default be omitted?It can be omitted, but it is not recommended, because it is used to prompt for incorrect conditions.Special cases:Case opt

){ + return1; -}Else{ the if(!Map.containskey (n)) { *Map.put (n, Fibo2 (n-1) + Fibo2 (n-2)); $ }Panax Notoginseng returnmap.get (n); - } the } + A @Test the Public voidtest1 () { + LongStart =System.currenttimemillis (); - Longresult = Fibo (50); $ LongEnd =System.currenttimemillis (); $SYSTEM.OUT.PRINTLN ("Calculated result:" +result); -SYSTEM.OUT.PRINTLN ("Time Consuming:" + (End-start) + "millis

. Almost all of the tool classes are static methods. 8, static code block, static{} loaded with the load of the class, executed only once, used to initialize the class, construct a block of code, and initialize the object. Initialization order, class variables are directly initialized, static blocks of code (class declaration order), instance variables are directly initialized, code blocks constructed, constructors. NBSP;9, documentation notes,/**

. The current thread must have the current object lock. 　　 Waite ()and theNotify ()must be insynchronizedfunction orsynchronized　Blockto make a call in the. 　　 3.yield Method Pauses the currently executing thread object. 　　 yield ()just to get the current thread back to the executable state, so executeyield ()threads are likely to be executed immediately after they have entered the executable state. 　　 yield ()only threads with the same priority or higher priority have an opportunity to execut

name by different parameter lists.Small exercise:1 classFunctionTest2{//objective to print the 99 multiplication table3 //Analysis: A dual for loop is used, and no return value4 Public Static voidPrint99 (inttem)5 {6 intx, y;7 for(x=1;x//limit the number of rows in the 99 multiplication table8 {9 for(y=1;y//because only print to 7*7,8*8 and so on, so yTen { OneSOP (x+ "*" +y+ "=" +x*y+ '

start at a fixed rate of repetition at a specified time. void scheduleAtFixedRate(TimerTasktask, longdelay, longperiod)Schedules the specified task to begin repeating a fixed rate of execution after a specified delay. Interview questions1: There are several implementations of multithreading, which are the different?two kinds. Inheriting the thread class implements a runnable interface extension: implements the callable interface.This has to b

, regardless of the condition.Example: Using a For loop to print a rectangle:Class Fordemo{public static void Main (String args[]) {for (int i = 0, i Printing results:***************It is concluded that the outer loop controls the number of rows in the rectangle, and the inner loop controls the number of each row, that is, the number of columns.This allows you to print:***************Class Fordemo{public static void Main (String args[]) {for (int i = 0, i If you print:***************Class Fordem

number itself.So the hash () function will only readjust its value if it is greater than or equal to 216 for a non-null hash value.But what good is the adjustment?Let's first look at the put, the hash value is how to deal with (part of the source code):When looking for a bucket, this hash value is the zise-1 with the table above, the initial is 16, we take 16来 example.Think that the algorithm is HashValue Size-1, at this time size-1=15 binary is 1 1 1 1, that is, any like 16 binary 0x?0 (binar

{public static void main (string[] args) {//define a string s = "hello1234worldkh6212260502006 823456 ";//I want to remove all the numbers, replace the string regex with" * "=" \\d "; String SS = "*"; String result = S.replaceall (regex, SS); SYSTEM.OUT.PRINTLN (result);}}Operation Result:4.8.5 the acquisition function of regular expressionsUse of the pattern class and the Matcher class/* Get function: * Get the three-character word in the following String * da Jia ting wo shuo,jin tian Yao xia

==null) { Synchronized (Single.class) {if (s==null)//double-judge S = new single ();}} return s;}} Three: Create an object in detailPerson p = new person ();What does the creation object do in memory?1. Load the Person.class file of the specified location on the hard disk into the memory first2. When the main method is executed, the space of the main method is opened in the occupied memory, and then a variable p is assigned to the stack area of the main method.3. Open an entity space in the heap

use conn.php package, and then use require to the desired page. 1) $conn = mysql_pconnect ("localhost", "root", "") or Die (Mysql_error ()); 2) mysql_select_db (" database name ", $conn);// connect to the specified database. 3) mysql_query ("Set names UTF8"); 4) $sql = ""; 5) $resultSet = mysql_query ($sql) or Die ("Invalid query:". mysql_error);// return sql statement result set; 6) while ($v = mysql

boundary \a The beginning of the input \g the end of the last matching \z input, only for the final terminator (if any) \z the end of the input greedy quantity word X?x, no X, once or once*x, 0 times or more x+x, one or more x{n} x, exactly n times x{n,} x, at least n times x{n,m} x, at least n times, but no more than M-times and capture-capturing groups can be numbered by calculating their opening brackets from left to right. For example, in an expression ((A) (B (C))), there are four such gro

* Must be back before class. Words to Remember:Double decimal string character characterInteger integer Scanner scanner score ScoreBoolean Boolean type True True False1. Variable three elements:①: Variable Type②: Variable Name③: Variable ValueEight types of data commonly used in 2.javaInteger type: int (+) long (+) byte (8) Short (16)Decimal type: Double (64) Double precision Float (32) Single precisionCharacter type: CharBoolean Type: Boolean3.

1 Packagetest;2 3 /**4 * content is output a hollow diamond5 * @authorA blind cat meets a dead tiger6 *7 */8 9 Public classlinxing {Ten One Public Static voidMain (string[] args) { A intN=15; - lingxing (n); - the } - - //outputs a diamond of n rows - Public Static voidLingxing (intN) { + //outputs the upper half of the first part - for(inti=0;i//Output N Rows + for(intj=0;j//print N+

go, how to calculate the strength gap between the two sides, and how should the team work? In fact, these efforts are no more than the time that Daniel spends studying technology. Daniel because of the 80% of his energy to improve himself, but in the "real life" this all players can not get out of the big environment mixed with the vivid. What's the bargain? It was a problem, and when I realized it, I was shocked.2. Limited time24 hours a day, eat and sleep 11 hours, then the day has 13 hours l

property controls the length of the input box.The 11.12.CSS Style:Syntax Format: selector {attribute 1: value; property 2: Value; property 3: value; ...}1. This syntax can be written in the CSS file, and then in the HTML file through the 2. Selector: element selector (tag Selector): Directly write the letter of the label, such as: body{attribute 1: Value; property 2: value;} input{Property 1: Value; Property 2: Value}ID Selector: #id {Property 1: Value; Property 2: Value}Class selector:. class{