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higher.In the HashMap implementation, you can also see that the following code replaces the previous version of JDK1.6 's while loop to ensure that the hash table's capacity is always an integer multiple of 2, replacing the cyclic shift with a shift operation. This code guarantees that the HASHMAP capacity is always 2 of the n-th static final int tablesizefor (int cap) { int n = cap-1;

default. HashMap expansion capacity is the current capacity doubling that is: capacity*2,hashtable expansion capacity is capacity doubling +1 that is: capacity*2+1 (about the expansion and filling factor will be said later) 4. The hash algorithm of the two is different, HashMap is first to the key (key) Hashcode code, and then the code worthy of high and low to Do (and) operations, the

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thread-safe2. Byte type and 0xFF do and operation, turn to the unsigned type of byte (0-255), the previous section also illustratesSource:1 Public synchronized intReadbyteB[],intOffintLen) {2 if(b = =NULL) {3 Throw Newnullpointerexception ();4}Else if(Off off) {5 Throw Newindexoutofboundsexception ();6 }7 8 if(Pos >=count) {9 return-1;Ten } One A intAvail = count-Pos; - if(Len >avail) { -Len =avail; the

) {if (key = = null) return Putfornullkey (value); int hash = hash (Key.hashcode ()); int i = indexfor (hash, table.length); for (entryWe use the put (K,v) method to add the object to the map, first to determine whether the passed key is null, and if NULL, call the Putfornullkey (value) method to correspond to the value of the null key. If it is not empty, first get the hash value of K, and then loop the map, if the value already exists on the update overwrite value and

LinkedListLinkedList is based on a two-way cyclic chain list implementation. It can also be manipulated as a stack, a queue, or a double-ended queue. Non-thread safe. The following directly paste ArrayList Java implementation (only part of the code), source Jdk1.8.0_25/src.zip. /** * * * * * * * * * * * The data structure ********* * contains: Node val

the same, here through submit submitted to the callable task, the return of future is actually futuretask, this can be in Found in the Abstractexecutorservice source code. Public This is the detail in the thread pool, and here it goes, back to our futuretask. Inheritance System By inheriting relationships we know that Futuretask is actually a combination of runnable and future. Data Structure /** * The r

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