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(addresses) of objects ).1 import java. util. *; 2 class CollectionDemo 3 {4 public static void main (String [] args) 5 {6 method (); 7 base_Method (); 8 9 10} 11 // calculates the intersection 12 public static void method () 13 {14 ArrayList al = new ArrayList (); 15 al. add ("java01"); 16 al. add ("java02"); 17 al. add ("java03"); 18 al. add ("java04"); 19 sop ("al original set" + al); 20 21 ArrayList al = new ArrayList (); 22 al2.add ("java01 ");

; 2 [4] => 3)Echo'';$ Values = array_shift ($ c); // leavesPrint_r ($ c); // Array ([0] => bcd [1] => 1 [2] => 2 [3] => 3)Echo'';Unset ($ c [2]); // deletes the specified position element.Print_r ($ c); // Array ([0] => bcd [1] => 1 [3] => 3)Echo''; // Array_rand () returns the array subscript randomly.$ Arr = array );

(, 1) uses a [] to represent an array consisting of all elements from a [3] to a [6] = array ([3, 4, 5, 6]); you can add step, but do not include the last element. A [:-1], which contains a negative number, indicates starting from the back. If the step size is a negative number, it indicates the reverse order, for example, a [7: 1: -

XML read exception invalid byte 1 of 1-byte UTF-8 Sequence To put it simply, this error may occur when you parse other users' XML formats, that is, when others generate xml, they do not save it as a UTF-8 character encoding format. In Windows of the Chinese version, Java is encoded as GBK by default, that is, although we have identified that we want to save XML in UTF-8 format, the files are actually saved

generaal '': 14 dec 1582 was followed by 25 dec 1582 Holland: 1 Jan 1583 was followed by 12 Jan 1583 Limburg and the southern provinces (currently Belgium ): 20 dec 1582 was followed by 31 Dec 1582 Or 21 dec 1582 was followed by 1 Jan 1583 Groningen: 10 Feb 1583 was followed by 21 Feb 1583 Went back to Julian in the summer of 1594 31 Dec 1700 was followed by 12 Jan 1701 Gelderland:

// If this bit is 1, the counter is added with 1; 12 If (K % 10 = 1 ) 13 CNT ++; 14 15 K = K/ 10 ; 16 }17 18 Return CNT; 19 } 20 21 // Returns the number of 1 contained in N integers from 1 to n. 22 Int Numbersof1sfrom1ton (unsign

($second/60): 1; Get the number of minutesif ($minute >= $minute $hour = Floor ($minute/60); Get the number of hoursElseIf ($minute >=) $minute $day = Floor ($minute/(60 * 24)); Get the number of daysElseIf ($minute >=) $minute $month = Floor ($minute/(60 * 24 * 30)); Get the number of months} elseif ($minute >= (60 * 24 * 365)) {//If the number of minutes is greater than or equal to the number of minut

Javascript (1) Summary of javascript Array usage (1), javascript Array /* 1. The js array, like the arrays in other languages, is an ordered list of data, but the difference is that each item of the js array can save any type of data. In addition, the js array size can be dynamically adjusted. 2. Create an Array: * // (1