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Flow-control structures: Difference between revisions
→{{header|Java}}: honorable mention for break and continue
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=={{header|Java}}==
"goto" is a reserved keyword in Java; but you cannot use it. There are currently no goto statements.
Java does provide two other statements that provide flow control: <tt>break</tt> and <tt>continue</tt>.
===break===
The <tt>break</tt> statement can be used to terminate a <tt>case</tt> clause in a <tt>switch</tt> statement and to terminate a <tt>for</tt>, <tt>while</tt> or <tt>do-while</tt> loop. In loops, a <tt>break</tt> can be ''labeled'' or ''unlabeled''.
<lang Java>switch (xx) {
case 1:
case 2:
/* 1 & 2 both come here... */
...
break;
case 4:
/* 4 comes here... */
...
break;
case 5:
/* 5 comes here... */
...
break;
default:
/* everything else */
break;
}
for (int i = 0; i < 10; ++i) {
...
if (some_condition) { break; }
...
}
_Time_: do {
for (int i = 0; i < 10; ++i) {
...
if (some_condition) { break _Time_; /* terminate the do-while loop */}
...
}
...
} while (thisCondition);</lang>
===continue===
The <tt>continue</tt> statement skips the current iteration of a <tt>for</tt>, <tt>while</tt>, or <tt>do-while</tt> loop. As with <tt>break</tt> the <tt>continue</tt> statement can be ''labeled'' or ''unlabeled'' to allow iterating a loop level other than the current one in nested loops.
<lang Java>while (condition) {
...
if (someCondition) { continue; /* skip to beginning of this loop */ }
...
}
top: for (int 1 = 0; i < 10; ++i) {
...
middle: for (int j = 0; j < 10; ++j) {
...
bottom: for (int k = 0; k < 10; ++k) {
...
if (top_condition) { continue top; /* restart outer loop */ }
...
if (middle_condition) { continue middle; /* restart middle loop */ }
...
if (bottom_condition) { continue bottom; /* restart bottom loop */ }
...
if (bottom_condition) { continue; /* this will also restart bottom loop */ }
...
}
...
}
....
}</lang>
=={{header|JavaScript}}==
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