java - Why == for Integer.valueOf(500) returns false but true for 5? -

-

इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 5 जवाब 
  System.out .println (पूर्णांक.वल्यूउफ़ (5) == पूर्णांक.वल्यूओफ़ (5)); System.out.println (पूर्णांक.वल्यूओफ़ (500) == पूर्णांक.वल्यूओफ़ (500));

आउटपुट है 

  true false

पहली पंक्ति क्यों सच रिटर्न करती है, लेकिन दूसरी पंक्ति झूठी वापसी करती है ? यहाँ क्या चाल है क्योंकि दोनों कॉलिंग valueOf () पर पूर्णांक वर्ग कर रहे हैं।

कम संख्या वाली पूर्णांक ऑब्जेक्ट्स के कैश्ड उदाहरण हैं, लेकिन उच्च मूल्य वाले पूर्णांक ऑब्जेक्ट नहीं हैं।

यदि आपने पहले नोटिस नहीं किया है, तो आप वस्तुओं की तुलना कर रहे हैं, नहीं ints।


Comments

Post a Comment

Popular posts from this blog

Active Directory Authenticated Proxy Server with Squid or CNTLM -

-
I need to configure a proxy server for a local network that authenticates with Active Directory and gives me access The control list enables you to configure the domain groups within AD. I am using: Static with Squid 2.7: Windows 2008 Server R2 I have followed this guide here: The proxy does not currently ask for any Active Directory accounts, as soon as I add the following lines, it starts denying this connection: ACL localnet proxy_auth Required src 192.168. 0.0 / 24 http_access permission localname This is my squid.conf: pastebin.com/ERuKtirc I see logs and 'none' or 'direct' L It comes together TCP_DENIED message 1415014073.069 1 192.168.0.63 TCP_DENIED / 407/1904 Received / -. None / - Text / html 1415014073.07 9 4 192.168.0.63 TCP_DENIED / 407 2304 Received / - None / - Text / html 1415014073.084 2 192.168.0.63 TCPDAD / 407 1904 Received / - None - - Text / html itemprop = "text"> This proxy returns a 407 request with a browse...
Read more

java - @PluginTarget(Node.class) not registering as neo4j plugin -

-
Simple class below will not show as a plugin package com.danmacias neoneoteplugin ; Import java.util.ArrayList; Import java.util.list; Import org.neo4j.graphdb. *; Import org.neo4j.server.plugins *; Import org.neo4j.graphalgo *; // import org.neo4j.tooling.GlobalGraphOperations; @ Description (expansion of Neo4j server to achieve all nodes or relationships) Public class GetPaths expanded the server plugin {@ name ("breadth_first_paths") @ Description ("first wide travel traversal of specific node"). @plugin target (node ​​class) public shaky & lt; Path & gt; GetPaths (@ Source Node Graphidi) {ArrayList & lt; Path & gt; Path = new arreelist & lt; & Gt; (); Return path; }} curl return {"extension": {"GetAll": {"get_all_nodes": "http: // localhost: 7474 / db / ext / GetAll / graphdb / get_all_nodes "} ...}, But when I Node.class both conditions GraphDatabaseService I change with Class ,...
Read more

python - Calculate STD manually using Groupby Pandas DataFrame -

-
Image
I was trying to write a solution, which is a different and a manual for calculating a mean and STD The way. I have created a = ["Apple", "Banana", "Cherry", "Apple"] B = [3,4,7,3] C = [5,4,1,4] D = [7,8,3,7] Pd DF = PD to import pandals DataFrame (index = class (4), column = list ("ABCD")) DF ["A"] = A DF ["B"] = BDF ["C"] = C DF ["D"] = D Again, I made a list of A duplication. Then I went through the group all the time of the objects and calculated the solution. import as np l = list (set (df.A)) df.groupby ('A', As_index = False) listMean = [0] * len (df.C) ListSTD = [0] * L in the LAN (df.C) X: s = np.mean (df [df ['A'] == x] for C =.) = Z = [index for index, enumerate In the object (df ['a']. Value] x == item i for z: listMean [i] = s in: s = np.std (df [df ['a'] == X] .cvalues) z = index for index, enumerate item (df ['a']. Value) if x ==...
Read more