entryset

oldCount = mRecordMap record. get (name); int count = oldCount + 1; // update record mRecordMap. put (name, count); // concatenate StringBuilder stringBuilder = new StringBuilder (); for (Map. entry Entry: mRecordMap. entrySet () {String key = entry. getKey (); Integer value = entry. getValue (); stringBuilder. append (execution method: + key); stringBuilder. append (, execution times: + value); stringBuilder. append ();} output (stringBuild

------------------------entryset-------------------------\ n");Traversing the entryset of a class collectionFor (entryClass numberInteger key = Entry.getkey ();List CollectionmapTraversal List CollectionFor (entryString Stuno = Entry2.getkey ();String stuname = Entry2.getvalue ();System.out.println (key+ "\t===>\t" +stuno+ "\t-->\t" +stuname);}}System.out.println ("\ n-------------------------------keySet--

. Nextint(Ten));Map. Put("three"R. Nextint(Ten));Print out the map System. out. println("Map:"+MAP);Traverse Key-value Iterator iter via Iterator = map. EntrySet(). Iterator();while (ITER. Hasnext()) {Map. EntryEntry = (Map. Entry) ITER. Next();System. out. println("Next:"+ Entry. GetKey() +" - "+entry. GetValue());}//HashMap number of key-value pairs System. out. println("Size:"+map. Size());ContainsKey (Object Key): Whether the key is included in th

member class. If each instance of the member class needs a reference pointing to its peripheral instance, the member class is made non-static; otherwise, it is made static. Suppose a nested class is inside a method. If you only need to create its instance in one place and a pre-stored type already exists, you can describe the features of this class, then it is made into an anonymous class; otherwise it is made into a local class.6. understand and use the libraryBe familiar with java. lang, java

. toString ());}/*** @ Param I: filter set. Delete the earliest inserted key. Do not delete the key that is not deleted.*/Private static void trimToSize (int I ){While (true ){Synchronized ("trimToSize "){// Meet the conditions and exitIf (sum Break;}// Obtain the first element of the linked list, that is, the element first put in.Map. Entry A: for (Map. Entry . EntrySet ()){ToEvict = entry;If (toEvict! = Null ){For (Entry .

method 1 */Set set = map. keySet (); Iterator it = set. iterator (); while (it. hasNext () {String key = (String) it. next (); String value = (String) map. get (key); System. out. println (key + "=" + value);} System. out. println ("------------------------");/** 2. traditional method 2 */Set set1 = map. entrySet (); Iterator it1 = set1.iterator (); while (it1.hasNext () {Map. entry entry = (Entry) it1.next (); String key = (String) entry. getKey ();

Create an Excel file and insert a value in javaPublic class test {/*** Exported CVS file* @ Param exportData the data set to be imported into Excel* @ Param rowMapper Excel Header* @ Param outputPath: location where the Excel file is saved* @ Return Excel File*/@ SuppressWarnings ("rawtypes ")Public static File createCSVFile (List exportData, LinkedHashMap rowMapper, String outputPath ){File csvFile = null;BufferedWriter csvFileoutputStream = null;Try {String temp = "Comparison and Analysis of D

(CommonUtils. isNotEmpty (map) {// write header information String filein = ""; for (Iterator tileIterator = map. entrySet (). iterator (); tileIterator. hasNext ();) {java. util. map. entry propertyEntry = (java. util. map. entry) TileIterator. next (); filein + = (String) propertyEntry. getValue () = null? "": (String) propertyEntry. getValue (); if (tileIterator. hasNext () {filein = filein + "" ;}}try {writer = new FileWriter (txtFile, true); wri

= (LinkedHashMap) iterator. next (); int cell = 0; for (Iterator titleIterator = titleMap. entrySet (). iterator (); titleIterator. hasNext ();) {java. util. map. entry titleEntry = (java. util. map. entry) titleIterator. next (); // note that in Excel, the first parameter table represents the column, and the second parameter represents the row ws. addCell (new jxl. write. label (cell, row, (String) titleEntry. getValue (); cell ++;} row ++;} // Add

* configuration * @ return */public static String toXML (Object bean, XStreamConfig xStreamConfig) {XStream xstream = constructXStream (xStreamConfig); return xstream. toXML (bean);}/*** convert the xml string into the corresponding object ** @ param xml * @ return */public static T fromXML (String xml) {return fromXML (xml, null);} public static T fromXML (String xml, XStreamConfig xStreamConfig) {XStream xstream = constructXStream (xStreamConfig); return (T) xstream. fromX

. In this way, you can directly set the background color on the frame to penetrate layers. The actual running effect is also very good, it is not affected by the actual set L F, and the custom component attributes are perfect. * It was found that this change was too violent, and some components experienced unexpected UI collapse, such as JFileChooser .. In addition to the background color, of course, there should be various other attributes that can be changed by default in this way, but what

Four Methods of Map traversal in Java, javamap How to traverse Map objects in Java Method 1: This is the most common and is also the most desirable Traversal method in most cases. Used when key values are required. 1 Map Method 2: traverse keys or values in the for-each loop. If you only need the key or value in map, you can use keySet or values to traverse, instead of entrySet. 1 Map This method performs better (10% faster) than

Java Map learning and javamap Learning I. Common APIs: Clear () Delete all mappings from Map Remove (Object key) Delete keys and associated values from Map Put (Object key, Object value) Associate a specified value with a specified key PutAll (Map t) Copy all mappings in the specified Map to this map EntrySet () Returns the Set view of the ing contained in the Map. Each element in the Set is

= function (fn ){If (typeof fn! = 'Function '){Return;}Var len = this. keys. length;For (var I = 0; I Var k = this. keys [I];Fn (k, this. data [k], I );}};/*** Get the key-value array (similar to Java's entrySet ())* @ Return: array of {key, value} key value object*/This. entrys = function (){Var len = this. keys. length;Var entrys = new Array (len );For (var I = 0; I Entrys [I] = {Key: this. keys [I],Value: this. data [I]};}Return entrys;};/*** Dete

until the end of the program in which the variable is located. That is, the static variable life cycle = Class life cycle.　　9. Do not create some unused objects, do not import some unused classes.　　10. Using buffered I/O streams:Buffered I/O streams can greatly improve I/O efficiency. BufferedWriter, BufferedReader, Bufferedinputstream, Bufferedoutputstream.　　11. Wrapper class data converted to string use: toString　　　　Integer i = 1;Wrapper class data conversion to string method speed ranking:i.

=NewURL (Realurl); URLConnection URLConnection=urlstring.openconnection (); HttpURLConnection HttpURLConnection=(httpurlconnection) URLConnection; Httpurlconnection.setrequestmethod ("GET");//Set Request MethodHttpurlconnection.setconnecttimeout (30000);//Connection host timeout timeHttpurlconnection.setreadtimeout (30000);//Read Data timeout timeHttpurlconnection.setrequestproperty ("Content-type", "application/x-www-form-urlencoded");//format the request dataHttpurlconnection.setrequestpropert

); // indicates the application to write data to a URL Connection. String content = getContent (params); // resolution parameter (request content) con. setRequestProperty ("Content-Type", "application/x-www-form-urlencoded"); // sets the Content con. setRequestProperty ("Content-Length", content. length () + ""); // set the content length OutputStream OS = con. getOutputStream (); OS. write (content. getBytes ("UTF-8"); // sends the parameter content OS. flush (); OS. close (); if (con. getRespo

conducive to our expansion. What should we do if we want to change the container? We need to refactor our code. This is not what we want in program design. We can use interfaces to block the use of specific containers, so that aop can customize containers. How can we achieve this? It's actually very simple. You can see: 1. class chart Transformation 2. Public service interface: public interface IProxyMehds { public void beforeBean(); public void afterBean(); }3. Public service cont

. setRequestMethod (POST); conn. setRequestPrope Rty (Connection, Keep-Alive); conn. setRequestProperty (User-Agent, Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv: 1.9.2.6); conn. setRequestProperty (Content-Type, multipart/form-data; boundary = + BOUNDARY); OutputStream out = new DataOutputStream (conn. getOutputStream (); // textif (textMap! = Null) {StringBuffer strBuf = new StringBuffer (); Iterator iter = textMap. entrySet (). iterator (); w

) // compare the equivalence between the specified Object and the Map HashCode () // return the hash code of this Map 2. Map update method. You can change the content of Map. Put (Object key, Object value) // Add a key-value pair. If the key already exists, the old value is overwritten. PutAll (Map t) // copy all mappings in the specified Map to this map Remove (Object key) // Delete the value associated with the key from the Map Clear () // Delete All mappings from the Map 3. Map Method of th