The break Statement example in Java
By: Norman Chap in Java Tutorials on 2007-10-13
The break statement has two forms: labeled and unlabeled. You saw the unlabeled form in the previous discussion of the switch statement. You can also use an unlabeled break to terminate a for, while, or do-while loop, as shown in the following BreakDemo program:
class BreakDemo {
public static void main(String[] args) {
int[] arrayOfInts = { 32, 87, 3, 589, 12, 1076,
2000, 8, 622, 127 };
int searchfor = 12;
int i;
boolean foundIt = false;
for (i = 0; i < arrayOfInts.length; i++) {
if (arrayOfInts[i] == searchfor) {
foundIt = true;
break;
}
}
if (foundIt) {
System.out.println("Found " + searchfor
+ " at index " + i);
} else {
System.out.println(searchfor
+ " not in the array");
}
}
}
This program searches for the number 12 in an array. The break
statement, shown in boldface, terminates the for loop when that
value is found. Control flow then transfers to the print statement at the end of
the program. This program's output is:
Found 12 at index 4
An unlabeled break statement terminates the innermost switch,
for, while, or do-while statement, but a
labeled break terminates an outer statement. The following program,
BreakWithLabelDemo, is similar to the previous program, but uses
nested for loops to search for a value in a two-dimensional array.
When the value is found, a labeled break terminates the outer for
loop (labeled "search"):
class BreakWithLabelDemo {
public static void main(String[] args) {
int[][] arrayOfInts = { { 32, 87, 3, 589 },
{ 12, 1076, 2000, 8 },
{ 622, 127, 77, 955 }
};
int searchfor = 12;
int i;
int j = 0;
boolean foundIt = false;
search:
for (i = 0; i < arrayOfInts.length; i++) {
for (j = 0; j < arrayOfInts[i].length; j++) {
if (arrayOfInts[i][j] == searchfor) {
foundIt = true;
break search;
}
}
}
if (foundIt) {
System.out.println("Found " + searchfor +
" at " + i + ", " + j);
} else {
System.out.println(searchfor
+ " not in the array");
}
}
}
This is the output of the program.
Found 12 at 1, 0
The break statement terminates the labeled statement; it does not
transfer the flow of control to the label. Control flow is transferred to the
statement immediately following the labeled (terminated) statement.
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