Java How to Program Fourth Edition - DCC

222 Control Structures: Part 2 Chapter 5
Fig. Fig. 5.13 5.13 Using a labeled break statement in a nested for structure (part 2 of 2).
The continue statement proceeds with the next iteration (repetition) of the immediately
enclosing while, for or do/while structure. The labeled continue statement,
when executed in a repetition structure (while, for or do/while), skips the remaining
statements in that structure’s body and any number of enclosing repetition structures and
proceeds with the next iteration of the enclosing labeled repetition structure (i.e., a repetition
structure preceded by a label). In labeled while and do/while structures, the program
evaluates the loop-continuation test immediately after the continue statement
executes. In a labeled for structure, the increment expression is executed, and then the
loop-continuation test is evaluated. Figure 5.14 uses the labeled continue statement in a
nested for structure to enable execution to continue with the next iteration of the outer
for structure.
The labeled for structure (lines 14–32) starts at the nextRow label. When the if
structure at line 24 in the inner for structure detects that column is greater than row, the
continue statement at line 25 executes, and program control continues with the increment
of the control variable of the outer for loop. Even though the inner for structure
counts from 1 to 10, the number of * characters output on a row never exceeds the value of
row.
Performance Tip 5.4
The program in Fig. 5.14 can be made simpler and more efficient by replacing the condition
in the for structure at line 21 with column , = and