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java Programming Glossary: statementWhy is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array of time stopping backing up and restarting. Consider an if statement At the processor level it is a branch instruction You are a.. . As hinted from above the culprit is this if statement if data c 128 sum data c Notice that the data is evenly distributed.. the first half of the iterations will not enter the if statement. After that they will all enter the if statement. This is very..
Why is using a wild card with a Java import statement bad? http://stackoverflow.com/questions/147454/why-is-using-a-wild-card-with-a-java-import-statement-bad is using a wild card with a Java import statement bad It is much more convenient and cleaner to use a single.. It is much more convenient and cleaner to use a single statement like import java.awt. than to import a bunch of individual classes.. ... What is wrong with using a wildcard in the import statement java import wildcard share improve this question The only..
PreparedStatement IN clause alternatives? http://stackoverflow.com/questions/178479/preparedstatement-in-clause-alternatives rather than a list of values. Consider the following SQL statement SELECT my_column FROM my_table where search_column IN Using.. workarounds are available java security jdbc prepared statement in clause share improve this question An analysis of the..
http://stackoverflow.com/questions/2707322/what-is-null-in-java to see how using null can complicate things. The first statement says that if the key isn't mapped null is returned. The second.. that if the key isn't mapped null is returned. The second statement says that even if the key is mapped null can also be returned...
Avoiding “!= null” statements in Java? http://stackoverflow.com/questions/271526/avoiding-null-statements-in-java &ldquo null&rdquo statements in Java I work with Java all day long. The most used idiom.. it isn't a valid response. 2 is easy. Either use assert statements assertions or allow failure for example NullPointerException.. toString output will be included in the error. An assert statement throws an Error AssertionError if the condition is not true...
What is the reason behind “non-static method cannot be referenced from a static context”? http://stackoverflow.com/questions/290884/what-is-the-reason-behind-non-static-method-cannot-be-referenced-from-a-static public static void main String strArgs The following statement causes the error. You know why.. java.util.List String someList..
Fastest way to determine if an integer's square root is an integer http://stackoverflow.com/questions/295579/fastest-way-to-determine-if-an-integers-square-root-is-an-integer return false Notes According to John's tests using or statements is faster in C than using a switch but in Java and C# there.. of 64 boolean values . Then instead of either switch or or statement I would just say if lookup int n 0x3F test else return false..
Switch Statement with Strings in Java http://stackoverflow.com/questions/338206/switch-statement-with-strings-in-java why I can't do this as in the technical way Java's switch statement works java string switch statement share improve this question.. way Java's switch statement works java string switch statement share improve this question Switch statements with String.. switch statement share improve this question Switch statements with String cases have been implemented in Java SE 7 at least..
What is a stack trace, and how can I use it to debug my application errors? http://stackoverflow.com/questions/3988788/what-is-a-stack-trace-and-how-can-i-use-it-to-debug-my-application-errors MY_ENTITY_UK_1 duplicate value s for column s MY_COLUMN in statement ... at org.hsqldb.jdbc.Util.throwError Unknown Source at org.hsqldb.jdbc.jdbcPreparedStatement.executeUpdate..
How to parse XML using the SAX parser http://stackoverflow.com/questions/4827344/how-to-parse-xml-using-the-sax-parser be pretty obvious by now. Take a look at the else if statement in the startElement method. Due to the fact that we have the..
How to get the insert ID in JDBC? http://stackoverflow.com/questions/1915166/how-to-get-the-insert-id-in-jdbc question If it is an auto generated key then you can use Statement#getGeneratedKeys for this. You need to call it on the same Statement.. for this. You need to call it on the same Statement as the one being used for the INSERT . You first need to create.. the INSERT . You first need to create the statement using Statement.RETURN_GENERATED_KEYS to notify the JDBC driver to return the..
java.lang.IllegalStateException: Cannot forward after response has been committed http://stackoverflow.com/questions/2123514/java-lang-illegalstateexception-cannot-forward-after-response-has-been-committe chk_select i if chkboxVal.equals ticked fwdurl true Statement st1 con.createStatement GroupId request.getParameter GroupId.. ticked fwdurl true Statement st1 con.createStatement GroupId request.getParameter GroupId i GroupDesc request.getParameter..
JDBC MySql Connection Pooling practices http://stackoverflow.com/questions/2313197/jdbc-mysql-connection-pooling-practices way private void close Connection connection ResultSet rs Statement stmt try if rs null rs.close catch Exception ex finally try.. ensure that you acquire and close all of them Connection Statement and ResultSet in a try finally block in the very same method.. throws SQLException Connection connection null PreparedStatement statement null try connection database.getConnection statement..
http://stackoverflow.com/questions/2658922/xss-prevention-in-java
http://stackoverflow.com/questions/2788080/reading-a-text-file-in-java part parts ... Tutorial Language Basics Control Flow Statements The for Statement You can use Integer#valueOf to convert a.. Tutorial Language Basics Control Flow Statements The for Statement You can use Integer#valueOf to convert a String into an Integer..
http://stackoverflow.com/questions/2839321/java-connectivity-with-mysql it same as above Connection conn dataSource.getConnection Statement stmt conn.createStatement ResultSet rs stmt.executeQuery SELECT.. conn dataSource.getConnection Statement stmt conn.createStatement ResultSet rs stmt.executeQuery SELECT ID FROM USERS ... rs.close..
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure http://stackoverflow.com/questions/2983248/com-mysql-jdbc-exceptions-jdbc4-communicationsexception-communications-link-fai import java.sql.DriverManager import java.sql.PreparedStatement import java.sql.ResultSet import java.sql.SQLException import.. import java.sql.SQLException import java.sql.Statement public class SqlTest public static void main String args throws.. jdbc mysql localhost 3306 projects user user1 password 123 Statement st conn.createStatement ResultSet rs st.executeQuery select..
Difference between Statement and PreparedStatement http://stackoverflow.com/questions/3271249/difference-between-statement-and-preparedstatement between Statement and PreparedStatement The Prepared Statement is a slightly.. between Statement and PreparedStatement The Prepared Statement is a slightly more powerful version.. between Statement and PreparedStatement The Prepared Statement is a slightly more powerful version of a Statement and should..
Switch Statement with Strings in Java http://stackoverflow.com/questions/338206/switch-statement-with-strings-in-java Statement with Strings in Java Why can't I switch on a String in Java..
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