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java Programming Glossary: returnshttp://stackoverflow.com/questions/101100/csv-api-for-java reader.readNext iterate over reader.readNext until it returns null String line reader.readNext There were some other choices..
Java: maintaining aspect ratio of JPanel background image http://stackoverflow.com/questions/11959758/java-maintaining-aspect-ratio-of-jpanel-background-image area . Fit Fill Basically I work with scale factors This returns the scaling factor for a particular size. I use this to make..
How to round a number to n decimal places in Java http://stackoverflow.com/questions/153724/how-to-round-a-number-to-n-decimal-places-in-java use the String.format method String.format .5g n 0.912385 returns 0.91239 which is great however it always displays numbers with.. if they are not significant String.format .5g n 0.912300 returns 0.91230 Another method is to use the DecimalFormatter DecimalFormat.. df new DecimalFormat #.##### df.format 0.912385 returns 0.91238 However as you can see this uses half even rounding...
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android app ActivityManager.html#getProcessMemoryInfo int This returns a low level MemoryInfo structure with all of this data The proportional..
How to upload files to server using JSP/Servlet? http://stackoverflow.com/questions/2422468/how-to-upload-files-to-server-using-jsp-servlet multipart form data to the form then request.getParameter returns null . During research I stumbled upon Apache Common FileUpload.. older than 3.1.2 had a bug wherein the getParameter still returns null . If you are targeting such a container and can't upgrade..
Avoiding “!= null” statements in Java? http://stackoverflow.com/questions/271526/avoiding-null-statements-in-java for something. Now you might make the contract that it returns null if there's no appropriate action. That leads the null checking..
How to use java.net.URLConnection to fire and handle HTTP requests? http://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests 1024 User Agent It can happen that a request returns an unexpected response while it works fine with a real web browser...
Design Patterns web based applications http://stackoverflow.com/questions/3541077/design-patterns-web-based-applications . Basically it should provide a creational method which returns a concrete implementation of an abstract interface type. In..
Generating random numbers in a range with Java http://stackoverflow.com/questions/363681/generating-random-numbers-in-a-range-with-java In Java there is a method random in the Math class which returns a double value between 0.0 and 1.0. In the class Random there.. In the class Random there is a method nextInt int n which returns a random value in the range of 0 inclusive and n exclusive ... inclusive and n exclusive . I couldn't find a method which returns a random value between two numbers. I have tried the following..
http://stackoverflow.com/questions/4112686/how-to-use-servlets-and-ajax inside the servlet and call it by the webbrowser it returns a new page containing that text. Is there a way to print the..
Remove Top-Level Container on Runtime http://stackoverflow.com/questions/6309407/remove-top-level-container-on-runtime jvisualvm one can see that periodic collection never quite returns to baseline. I've exaggerated the vertical axis by starting..
HTTP URL Address Encoding in Java http://stackoverflow.com/questions/724043/http-url-address-encoding-in-java java.net.URLEncoder.encode url.toString ISO 8859 1 returns me http 3A 2F 2Fsearch.barnesandnoble.com 2Fbooksearch 2Ffirst..
Why is char[] preferred over String for passwords? http://stackoverflow.com/questions/8881291/why-is-char-preferred-over-string-for-passwords passwords In Swing the password field has a getPassword returns char method instead of the usual getText returns String method... returns char method instead of the usual getText returns String method. Similarly I have come across a suggestion not..
How do I implement a Linked List in Java? [closed] http://stackoverflow.com/questions/10042/how-do-i-implement-a-linked-list-in-java Link first LinkList constructor public LinkList first null Returns true if list is empty public boolean isEmpty return first null..
http://stackoverflow.com/questions/13999506/threads-with-key-bindings y coordinates to our set return mask return our set Returns true if there is a collision between object a and object b public..
add thumnails to spring layout like a grid? http://stackoverflow.com/questions/15961412/add-thumnails-to-spring-layout-like-a-grid int align int hgap int vgap super align hgap vgap Returns the preferred dimensions for this layout given the i visible.. Container target return layoutSize target true Returns the minimum dimensions needed to layout the i visible i components.. target false minimum.width getHgap 1 return minimum Returns the minimum or preferred dimension needed to layout the target..
Byte order mark screws up file reading in Java http://stackoverflow.com/questions/1835430/byte-order-mark-screws-up-file-reading-in-java byte 0x00 byte 0xFE byte 0xFF UTF 32 big endian Returns a code String code representation of this code BOM code value... value. public final String toString return description Returns the bytes corresponding to this code BOM code value. public.. this.bom BOM.NONE break if read 0 in.unread bom 0 read Returns the code BOM code that was detected in the wrapped code InputStream..
How to handle calendar TimeZones using Java? http://stackoverflow.com/questions/230126/how-to-handle-calendar-timezones-using-java tz cal.getTimeZone log.debug input calendar has date date Returns the number of milliseconds since January 1 1970 00 00 00 GMT..
How to retrieve and display images from a database in a JSP page? http://stackoverflow.com/questions/2340406/how-to-retrieve-and-display-images-from-a-database-in-a-jsp-page Prepare. String name request.getPathInfo .substring 1 Returns foo.gif . You may want to do nullchecks here to avoid NPE's...
http://stackoverflow.com/questions/2707322/what-is-null-in-java from java.lang.System public static Console console Returns The system console if any otherwise null . This is a very common.. public String readLine throws IOException Returns A String containing the contents of the line not including any.. example this time from java.util.Map K V V get Object key Returns the value to which the specified key is mapped or null if this..
Validating input using java.util.Scanner http://stackoverflow.com/questions/3059333/validating-input-using-java-util-scanner pattern to the Scanner . API links hasNext String pattern Returns true if the next token matches the pattern constructed from..
http://stackoverflow.com/questions/3389348/parse-any-date-in-java pattern matching with the given date string. Returns null if format is unknown. You can simply extend DateUtil with..
How can a Java program get its own process ID? http://stackoverflow.com/questions/35842/how-can-a-java-program-get-its-own-process-id to the docs there are no guarantees about this value Returns the name representing the running Java virtual machine. The..
How to use the toString method in Java? http://stackoverflow.com/questions/3615721/how-to-use-the-tostring-method-in-java improve this question From the Object.toString docs Returns a string representation of the object. In general the toString..
Best way to represent a fraction in Java? http://stackoverflow.com/questions/474535/best-way-to-represent-a-fraction-in-java res.numerator this.denominator res.denominator Returns this f. public BigFraction add BigFraction f if f null throw.. f.numerator denominator.multiply f.denominator Returns this b. public BigFraction add BigInteger b if b null throw.. numerator.add denominator.multiply b denominator true Returns this n. public BigFraction add long n return add BigInteger.valueOf..
Deep clone utility recomendation http://stackoverflow.com/questions/665860/deep-clone-utility-recomendation Lists when using clone This is what clone for HashMap says Returns a shallow copy of this HashMap instance the keys and valuesthemselves..
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