Contents - Cultural View

Java syntax 182
for loop
for loops in Java include an initializer, a condition and a counter expression. It is possible to include several
expressions of the same kind using comma as delimiter. However, unlike C, comma is just a delimiter and not an
operator.
for (int i = 0; i < 10; i++) {
}
doSomething();
// A more complex loop using two variables
for (int i = 0, j = 9; i < 10; i++, j -= 3) {
}
doSomething();
Like C, all three expressions are optional, the following loop will be infinite:
for (;;) {
}
doSomething();
Enhanced for loop
Enhanced for loops have been available since J2SE 5.0. This type of loop uses built-in iterators over arrays and
collections to return each item in the given collection. Every element will be returned and reachable in the context of
the code block. When the block has been executed the next item will be returned until there are no items remaining.
Unlike C# this kind of loop does not involve a special keyword but instead uses a different notation style.
for (int i : intArray) {
}
doSomething(i);
Jump statements
Labels
Labels are given points in code used by break and continue statements. Despite the presence of the goto keyword, it
cannot be used to jump to specific points in the code.
start:
someMethod();
break statement
The break statement breaks out of the closest loop or switch statement. Execution continues in the statement after the
terminated statement, if any.
for (int i = 0; i < 10; i++) {
}
while (true) {
}
break;
// Will break to this point
It is possible to break out of the outer loop using labels: