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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.
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.
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) {
FREE Java Selection Structures Tutorial. Learn from Cramerz simple and free books, tutorials and videos.
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.
A control structure is any mechanism that departs from the default of straight-line execution. » selection • if statements • case statements » iteration • while loops (unbounded) • for loops • iteration over collections » other • goto • call/return • exceptions • continuations Control Structures (1/2)
