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Flow of control through any given function is implemented with three basic types of control structures: Sequential: Default mode. Statements are executed line by line. Selection: Used for decisions, branching { choosing between 2 or more alternative paths. if - else. switch. conditional statements.
Java's branching control uses the if-else structure (http://docs.oracle.com/javase/tutorial/java/nutsandbolts/if.html) for selecting which blocks of code should run. The if-statement by itself lets us choose whether or not to run a block of code: if ( boolExpr ) { // run these statements only if boolExpr was true; otherwise, skip. }
22 Σεπ 2020 · In this chapter, we look at the main control structures in Java that enable selection and iteration. For selection, we cover “if-else”, “switch”, “break” and “continue” statements, and the ternary operator.
Using Selection: the CoinExample Class • if statement based on using a randomly generated number to represent a coin being flipped • The Java Math class random operation –Returns a random double >= 0.0 and < 1.0 • Use random number in if statement 10 double randomNumber = Math.random(); if (randomNumber < 0.5) {
iteration structures. Selection structures, sometimes also called decision structures, allow the program to take two or more different paths based on different conditions, whereas iteration structures, sometimes called repetition structures, allow a pro-gram to repeat a part .
Making Selections. The “if” keyword is always followed by parentheses. The expression in the parentheses must evaluate to a boolean. The statement can be a single statement or a block. Safer as a block. if (booleanExpression) statement; if (booleanExpression) { statement(s); }
Selection control structures are structures in which blocks of code are either executed, or not, depending on a particular condition or conditions. There are three categories of selection control structures: Single selection control structures. if statements. Double selection control structures. if – else statements.
