Java syntax: Difference between revisions

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==Operators==

Operators in Java are similar to those in [[C++]]. However, there is no <code>delete</code> operator due to [[Garbage collection (computer science)|garbage collection]] mechanisms in Java, and there are no operations on [[Pointer (computer programming)|pointers]] since Java does not support them. Another difference is that Java has an unsigned right shift operator (<code>>>></code>), while C's right shift operator's signedness is type-dependent. Operators in Java cannot be [[Operator overloading|overloaded]]. The only overloaded operator is <code>operator+</code> for string concatenation.

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===Iteration statements===

Iteration statements are statements that are repeatedly executed when a given condition is evaluated as true. Since [[J2SE 5.0]], Java has four forms of such statements. The condition must have type <code>boolean</code> or Boolean, meaning C's<syntaxhighlight code>java.lang="c".Boolean</code>.

For example, the following code is valid in C but results in a compilation error in Java.

<syntaxhighlight lang="c">

while (1) {

doSomething();

}

</syntaxhighlight>results in a compilation error.

====<code>while</code> loop====

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</syntaxhighlight>

Like C, all three expressions are optional. The following loop isnever infiniteterminates:

<syntaxhighlight lang="java">

for (;;) {

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</syntaxhighlight>

====Enhanced <code>for</code>Foreach loop====

{{Main|Enhanced forForeach loop}}

[[enhanced for loop|Enhanced <code>for</code>Foreach loop]]s 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 is returned and reachable in the context of the code block. When the block is executed, the next item is returned until there are no items remaining. This for loop from Java was later added to [[C++11]]. Unlike [[C Sharp (programming language)|C#]], this kind of loop does not involve a special keyword, but instead uses a different notation style.

<syntaxhighlight lang="java">