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Chpt. 7 Flow Control

If expressions are the meat of programming, than I suppose that loops and other control statements are the recipes for using the meat. (Maybe that's taking the analogy a bit too far.) Control statements tell Java what to do when. They bring order and reason to a program and help avoid repeating code.

Generally speaking, a control statement is a statement that directs the execution of other statements. More specifically, a selection statement is one that tells Java which statement should be executed, depending on the evaluation of an expression. A loop statement is one that doubles back on itself, repeating the same statements over and over until a certain condition is met.

There are five main types of control statements used in Java:

Name Form Type
if if (expression) statement;
      OR
if (expression) statement;
else statement;
selection
while while (expression) statement; loop
do-while do statement while (expression); loop
for for (initialization; condition; increment)
  statement;
loop
switch switch (expression) {
  case value1:
    statement1;
    break;
  case value2:
    statement2;
    break;
  ...
  default:
    defaultStatement;
}
selection

Don't worry if these don't make sense yet. We'll be going into each one individually. So, let's begin.



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