Contents - Cultural View

Java syntax 179
import statement
The import statement loads a specific class or classes from a referenced package. It must be placed at the top of a
code file after the package declaration.
import java.io.InputStream; /*Now it is allowed to use InputStream
class without referencing its full name including the package*/
import java.util.*; /*This is a star import which loads all
classes contained in java.util package*/
Since J2SE 5.0 it is allowed to do static imports, which allows to access members (fields and methods) defined in the
imported class as public static without specifying the class name:
import static java.lang.System.out;
public class HelloWorld {
}
public static void main(String[] args) {
}
Operators
out.println("Hello World!"); /*Without the static import it would
be required to write "System.out" instead of just "out".*/
Operators in Java are mostly similar to those in C++. There's no delete operator due to garbage collection
mechanisms in Java and no operations on pointers since Java does not support them, another difference is that Java
has unsigned right shift operator (>>>). Operators in Java cannot be overloaded.
Precedence Operator Description Associativity
1 () Method invocation Left-to-right
[] Array access
. Class member selection
2 ++ -- Postfix increment and decrement
3 ++ -- Prefix increment and decrement Right-to-left
+ - Unary plus and minus
! ~ Logical NOT and bitwise NOT
(type) Type cast
new Class instance or array creation