Editing Java syntax (section)

===Jump statements===

====Labels====
Labels are given points in code used by <code>break</code> and <code>continue</code> statements. The Java <code>goto</code> keyword cannot be used to jump to specific points in code.

<syntaxhighlight lang="java">
start:
someMethod();
</syntaxhighlight>

====<code>break</code> statement====
The <code>break</code> statement breaks out of the closest loop or <code>switch</code> statement. Execution continues in the statement after the terminated statement, if any.

<syntaxhighlight lang="java">
for (int i = 0; i < 10; i++) {
    while (true) {
        break;
    }
    // Will break to this point
}
</syntaxhighlight>

It is possible to break out of the outer loop using labels:

<syntaxhighlight lang="java">
outer:
for (int i = 0; i < 10; i++) {
    while (true) {
        break outer;
    }
}
// Will break to this point
</syntaxhighlight>

====<code>continue</code> statement====
The <code>continue</code> statement discontinues the current iteration of the current control statement and begins the next iteration. The following <code>while</code> loop in the code below reads characters by calling <code>getChar()</code>, skipping the statements in the body of the loop if the characters are spaces:

<syntaxhighlight lang="java">
int ch;
while (ch == getChar()) {
    if (ch == ' ') {
        continue; // Skips the rest of the while-loop
    }

    // Rest of the while-loop, will not be reached if ch == ' '
    doSomething();
}
</syntaxhighlight>

Labels can be specified in <code>continue</code> statements and <code>break</code> statements:

<syntaxhighlight lang="java">
outer:
for (String str : stringsArr) {
    char[] strChars = str.toCharArray();
    for (char ch : strChars) {
        if (ch == ' ') {
            /* Continues the outer cycle and the next
            string is retrieved from stringsArr */
            continue outer;
        }
        doSomething(ch);
    }
}
</syntaxhighlight>

====<code>return</code> statement====
The <code>return</code> statement is used to end method execution and to return a value. A value returned by the method is written after the <code>return</code> keyword. If the method returns anything but <code>void</code>, it must use the <code>return</code> statement to return some value.

<syntaxhighlight lang="java">
void doSomething(boolean streamClosed) {
    // If streamClosed is true, execution is stopped
    if (streamClosed) {
        return;
    }
    readFromStream();
}

int calculateSum(int a, int b) {
    int result = a + b;
    return result;
}
</syntaxhighlight>

<code>return</code> statement ends execution immediately, except for one case: if the statement is encountered within a <code>try</code> block and it is complemented by a <code>finally</code>, control is passed to the <code>finally</code> block.

<syntaxhighlight lang="java">
void doSomething(boolean streamClosed) {
    try {
        if (streamClosed) {
            return;
        }
        readFromStream();
    } finally {
        /* Will be called last even if 
        readFromStream() was not called */
        freeResources();
    }
}
</syntaxhighlight>