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Operator == != > < >= <= Result Equal to Not equal to Greater than Less than Greater than or equal to Less than or equal to

where variable is the variable name and value is the value you want to assign the variable For example, to set the environment variable FOO to the value BAR, type

The outcome of these operations is a boolean value The relational operators are most frequently used in the expressions that control the if statement and the various loop statements Any type in Java, including integers, floating-point numbers, characters, and Booleans can be compared using the equality test, ==, and the inequality test, != Notice that in Java equality is denoted with two equal signs, not one (Remember: a single equal sign is the assignment operator) Only numeric types can be compared using the ordering operators That is, only integer, floating-point, and character operands may be compared to see which is greater or less than the other As stated, the result produced by a relational operator is a boolean value For example, the following code fragment is perfectly valid:

int a = 4; int b = 1; boolean c = a < b;

Whenever you set environment variables in this way, they stay local to the running shell If you want that value to be passed to other processes that you launch, use the export built-in command The format of the export command is as follows:

In this case, the result of a<b (which is false) is stored in c If you are coming from a C/C++ background, please note the following In C/C++, these types of statements are very common:

Execution!

where variable is the name of the variable In the example of setting the variable FOO, you would enter this command:

4:

Systemoutprintln(name + " got: " + SharedaigetAndSet(i)); } }

TIP You can combine the steps for setting an environment variable with the export command, like so: [yyang@fedora-serverA ~]$ export FOO=BAR

In the program, a static AtomicInteger named ai is created by Shared Then, three threads of type AtomThread are created Inside run( ), Sharedai is modified by calling getAndSet( ) This method returns the previous value and then sets the value to the one passed as an argument The use of AtomicInteger prevents two threads from writing to ai at the same time In general, the atomic operations offer a convenient (and possibly more efficient) alternative to the other synchronization mechanisms when only a single variable is involved

Given the power and flexibility found in the new concurrency utilities, it is natural to ask the following question: Do they replace Java s traditional approach to multithreading and synchronization The answer is a resounding no! The original support for multithreading and the built-in synchronization features are still the mechanism that should be employed for many, many Java programs, applets, and servlets For example, synchronized, wait( ), and notify( ) offer elegant solutions to a wide range of problems However, when extra control is needed, the concurrency utilities are now available to handle the chore

If the value of the environment variable you want to set has spaces in it, surround the variable with quotation marks Using the preceding example, to set FOO to Welcome to the BAR of FOO , you would enter