JavaLanguage Section Index

Project Coin refers to a number of small changes to the Java language that were included in JDK 7.

New in Java 7, JSR 292 allows dynamic languages to run faster in the JVM than in previous JDK versions.

Here are the major language changes in JDK7.

The split() method of String takes a regular expression. The pattern "[s,]+" should to the trick. It says the separator will be one or more white space characters or comma.

How can the following throw a NullPointerException? Integer i = ...; int j = i;

Magic numbers are literal numeric constants, typically stuck in the middle of code with no obvious reason for existance. Instead of using magic numbers, they should be declared as constants (priva...more

You're not alone here. JSR 310 is attempting to remedy this situation (http://www.jcp.org/en/jsr/detail?id=310). In the meantime, you can try out Joda time (http://joda-time.sourceforge.net/), wh...more

Chet Haase at Sun claims "Java on Vista: Yes, it Works" at http://weblogs.java.net/blog/chet/archive/2006/10/java_on_vista_y.html. There is more said there than can be written here.more

Class<String> is the generics way of writing String.class. It allows you to improve type safety.

Class<String> is the generics way of writing String.class. It allows you to improve type safety.

Boolean.FALSE < Boolean.TRUE

Java SE v1.3.1_18 (and later) Java SE v1.4.2_11 (and later) Java SE 5.0 u6 (and later) Java SE 6 SE

My application is using the the classes from some jar file. I have made my application as jar and when I run my jar file I am getting the error "java.lang.NoClassDefFoundError:". These classes are ...more

Subclasses of SQLException have two types, transient and non-transient. Transient exceptions are those that when retried could succeed without changing anything. Non-transient exceptions are tho...more

How can I find the dates of all the weekend days in a year?