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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.
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.
Types of Control Flow Flow of control through any given function is implemented with three basic types of control structures: I Sequential: Default mode. Statements are executed line by line. I Selection: Used for decisions, branching { choosing between 2 or more alternative paths. I if I if - else I switch I conditional statements
A control structure is a control statement and the statements whose execution it controls. Overall Design Question: What control statements should a language have, beyond selection and pretest logical loops? Single entry/single exit are highly desirable. a lesson learned from structured programming. 4. Selection Statements. Design Issues:
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); }
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) {
24 Δεκ 2013 · Selection structures are explained in this chapter using flowcharts, pseudocode, and the corresponding Java code. The if-then, if-then-else, and nested if structures, including if-then-else-if and if-then-if structures, are introduced. The dangling-else problem is also discussed.
