java code analysis tools

Comh Ashcode (); 4 Comhashcode B = new Comhashcode (); 5 System.out.println (A.hashcode ()); 870919696 6 System.out.println (B.hashcode ()); 298792720 7 8 Long num1 = new Long (8), 9 long num2 = new Long (8), System.out.println (num1.hashcode ()); 811 System.out.println (Num2.hashcode ()); 812 }13}Summarize:(1) binding. when the Equals method is overridden, it is often necessary to override the hashcode method to

Introduction: Conversion and conversion manipulation tools for basic data processing in JavaFirst, the realization function1, int pre-byte mutual transfer2, int and byte[] turn each other3, short and byte to turn each other4, short and byte[] mutual transfer5, 16 bit short and byte[] mutual transfer6, long pre-byte[] Mutual transfer7, byte[] and InputStream Mutual transfer8, byte and string transfer9, 16 binary character representable int10, decimal t

[TOC] Java Asynchronous nonblocking io NiO uses the NIO implementation of the Code Analysis Timeserver program to implement the complete codeTimeserver program from the book "Netty Authoritative Guide", NiO code is really a bit difficult to understand (this is one of the reasons behind the need to use Netty), but

Launcher Startup Class This article is the source analysis part of the parent delegation mechanism, and the parent delegation model in the class loading mechanism is very important for the stable operation of the JVM. But the source is actually relatively simple, then briefly introduce let's start with the startup class. there is a Launcher class Sun.misc.Launcher; take a closer look at this short line of comments to get useful information PS: Direc

Source code analysis: Memory Allocation of Java objects (1) Java objects are allocated in two ways: Fast allocation and slow allocation. The lock-free pointer collision technology is used to distribute the objects in the new generation Eden zone, the slow distribution has different invocation Layers Based on the imple

tools, including various plug-in tools, to help develop a variety of Java applications. The true advantage of this IDE is that it allows developers to use different languages, for example, it can also provide C/C ++ and php ide. This makes it an all-in-one resource for Java development. Http://www.eclipse.org/ 3. NetB

I. Overview of HashMap HashMap is an asynchronous implementation based on the map interface of a hash table. This implementation provides all the optional mapping operations and allows NULL values and NULL keys to be used. This class does not guarantee the order of mappings, especially if it does not guarantee that the order is immutable. II. data structure of HashMapIn the Java programming language, the most basic structure is two kinds, one is the

.containsValue (Object value) to find if the map contains the specified value1 System.out.println (Hashmap.get ("A")); // - 2 System.out.println (Hashmap.containskey ("A")); // true 3 System.out.println (Hashmap.containsvalue (100)); // trueView Code modifying elements 1.put (K key, V value) finds value with the same key value, overwriting with the new value value1 Hashmap.put ("A", +); 2 System.o

Java class set framework-wide list source code analysis Shortlist The linked list is implemented based on a two-way cyclic linked list. It can also be used as a stack, queue, or double-end queue for operations. Non-thread security. The following describes the Java Implementation of ArrayList (only part of the

can be skipped ")SYSTEM.OUT.PRINTLN ("Can develop to designers")//you has a quality that ordinary people do not have: a compromise.}}}}--------------------------------------------------------------------------------------------Import java. Boulevard to Jane Chapter I. *;Package 345;public class 345{public static void Main (string[] args){string you;if (you== "programmer"){SYSTEM.OUT.PRINTLN ("To analyze things clearly");It takes time to work actively

through the adapter pattern, TreeMap, HashMap, The implementation classes such as Weakhashmap are implemented by inheriting Abstractmap, in addition, the hashtable of the map interface is implemented directly by the less commonly used, and vector is the collection class introduced by JDK1.0. Iterator is an iterator that iterates through the collection (cannot traverse the map, only to traverse the collection), and the collection implementation class implements the iterator () function, which r

of initialcapacity and a load factor of 0.75.HashMap (int initialcapacity, float loadfactor): Creates a HashMap with the specified initial capacity, specified load factor.The HashMap base constructor hashmap (int initialcapacity, float loadfactor) has two parameters, which are the initial capacity initialcapacity and the load factor loadfactor.The maximum capacity of the initialcapacity:hashmap, which is the length of the underlying array.Loadfactor: Load factor loadfactor is defined as: the nu

Code Analysis in JAVA, javapcm TheAudio Data of PCM voice changes. After struggling for a week, I finally found a framework implemented in pure Java-TarsosDSP. Very powerful! Real-time audio processing! Of course, I only used to process files. Actually, the logic is the same. GitHub address for TarsosDSP: The https://g

entryIterating through the iterative interface directly using a doubly linked list, here do not repeat, you can see the source code is easy to understand. Note that the implementation of the listing overrides the related build iterator method in the parent class.TreeMap and Currenthashmap can open a separate article to analyze. Here's a brief. TreeMap is based on a B-tree map, sorted by key. Currenthashmap is a powerful class in concurrent packages t

buffer", which wakes the waiting thread on Notfull when the buffer data is read.(02) In the main function of ConditionTest2, 10 "Write Threads" are started, the data is written to Boundedbuffer continuously (0-9), and 10 "read Threads" are started, and the data is read continuously from Boundedbuffer.(03) Simple analysis of the results of the operation. 1, the P1 thread writes 1 to the buffer. at this point, the buffer data: | 1 | | |

parameter (that is, the required capacity), and the element is then copied to the new array using the Arrays.copyof () method. 　　3. Many methods have joined the synchronized synchronization statement to ensure thread safety.4. Also in the search for a given element index value, and so on, the source of the value of the element is divided into null and NOT null two case processing, the vector also allows the element is null.5. Many other places are similar to the ArrayList, and vectors are now l

, TreeMap, HashMap, Weakhashmap and other implementation classes are implemented by inheriting Abstractmap, in addition, the less commonly used Hashtable directly implement the map interface, which and vector are JDK1.0 introduced in the collection class.Iterator is an iterator that iterates through a collection (it cannot traverse the map, only to traverse collection), and collection implements the iterator () function, which returns a iterator object that iterates through the collection. Listi

, TreeMap, HashMap, Weakhashmap and other implementation classes are implemented by inheriting Abstractmap, in addition, the less commonly used Hashtable directly implement the map interface, which and vector are JDK1.0 introduced in the collection class.Iterator is an iterator that iterates through a collection (it cannot traverse the map, only to traverse collection), and collection implements the iterator () function, which returns a iterator object that iterates through the collection. Listi

real specific subclass, it is embodied in the way of the inner class.3. The source of the iterator:1 Public InterfaceIterator {2 BooleanHasnext ();3 Object Next ();4 }5 6 Public Interfaceiterable {7 Iterator Iterator ();8 }9 Ten Public InterfaceCollectionextendsiterable { One Iterator Iterator (); A } - - Public InterfaceListextendsCollection { the Iterator Iterator (); - } - - Public classArrayListImplementsList { + PublicIterator Iterator () { - return NewItr (); +

native voidNotifyall();Public final native voidwait(LongTimeoutthrowsInterruptedexception;Public final voidwait(LongTimeout, intNanosthrowsinterruptedexception {if(Timeout 0) {throw NewIllegalArgumentException ("Timeout value is negative"); }if(Nanos 0|| Nanos >999999) {throw NewIllegalArgumentException ("nanosecond timeout value out of range"); }off(Nanos >=500000|| (Nanos! =0 Timeout = =0)) {timeout++; } Wait (timeout); }Public final voidwait()throwsinterruptedexceptio