Flow Control - Java for COBOL Programmers - page 181

TABLE 7.1 JAVA FLOW CONTROL OPERATORS

Construct Description COBOL Equivalent

if condition…else… Evaluate condition and perform either IF condition …ELSE …

the first or the second code block

for condition… Iteratively perform the next code block PERFORM paragraph

until condition is not true VARYING

while condition… Perform the next code block, until PERFORM paragraph UNTIL

condition is not true

do…while Perform the next code block, evaluate PERFORM paragraph UNTIL

condition, and if true, perform code condition

block again

switch (i) case… Perform the appropriate code block EVALUATE

depending on the value of (i)

case…

break Exit the current loop EXIT

continue Reiterate the current loop from

the beginning

labeled break Exit the loop with this name. GO TO

The statement past the labeled loop
will be the next statement executed.

E XERCISES : F LOW C ONTROL

Time to visit the example classes again and try out all these new ideas.

1. Edit the HelloWorld.java source file in your java4cobol directory with a
text editor. Remove the lines after the if statement where you tested the
value of textMsg .
2. First, you need to adjust the if code block in order to explore the scope of
local variables. After the if statement where you tested the value of
textMsg , add these additional bolded Java statements: