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To solve this problem, java provides control statements. 1. Selection Statement. Like all high-level programming languages, Java provides selection statements: statements that let you choose actions with alternative courses. The program can decide which statements to execute based on a condition.
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 Criteria. • if-else statement: Implements a decision structure for two alternatives Syntax: if (condition) statement executed if condition is true; else statement executed if condition is false; Selection Criteria (continued) The condition is evaluated to its numerical value: A non-zero value is considered to be true.
8 4.4 Control Structures • Java has a sequence structure “built-in” • Java provides three selection structures – if – If…else – switch • Java provides three repetition structures – while – do…while – do • Each of these words is a Java keyword
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) {
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. }
11 Ιουν 2024 · In this tutorial, we’ll explore control structures in Java. There are three kinds of control structures: Conditional Branches, which we use for choosing between two or more paths. There are three types in Java: if/else/else if, ternary operator and switch.
