✔ Java's Conditional If Statement | (Video 15) смотреть онлайн

Java “if” Statements are flow control structures/statements which controls an execution flow. There are 3 types of if statements.

(1) If Then
(2) If Then Else
(3) If Then Else-If

When the 1st “if” condition returns true then its statement is executed. When the 1st “if” condition returns false then subsequent condition(s) are evaluated and potentially executed. The subsequent condition(s) are “else-if” statements which do not execute if they return false. As a result, a default else clause extends the “if” statement and automatically execute its statement when all previous conditions return false.

All 3 Java if statements are demonstrated step by step in this video.

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► Transcript
Hello Everybody, Welcome To Selenium 4 Beginners. My name is Rex Allen Jones II. We are going to discuss the if Statement which is a Java Conditional Statement. Conditional Statements are part of Java’s Flow Control Structures also known as Flow Control Statements. A Flow Control Statement directs a program’s flow. Regarding the if Statement, this flow executes a particular statement if the condition returns true or false.
You can download the transcript, presentation and code at https://tinyurl.com/Java-If-Statements

Java provides 3 types of if Statements. First is the If Then Statement. Second is the If Then Else Statement. Third, is the If Then Else-If Statement. The syntax for If Then begins with if (condition). If is a keyword that always start the if Statement. The condition generates a boolean result which returns true or false. After the condition, is an optional opening curly bracket followed by a statement.

This statement can be a block of statements that’s only executed if the condition is true. A Semi-colon completes the statement. The second bracket is a closing bracket and only required if there is an opening bracket.

Next is the syntax for If Then Else which contains an if (condition), statement, and optional brackets just like the previous Statement. However, this statement includes an else clause. After the else clause, is a statement that can be executed.

We see an if keyword, condition, opening bracket, statement, semi-colon, and closing bracket. The same information that was already covered for If Then Statement except the second statement. Now, we get a better picture of the statements. If the condition, returns true then the first statement is executed but if the condition returns false then the second statement is executed. The else clause extends the if Statement when the condition returns false.

The last if Statement is If Then Else-If. It looks like the previous Statement but there’s some clauses before the else clause. We have a clause for else if followed by a condition. There’s also a statement. Depending on our program, we may add more else if clauses with a condition and statement.

We have an if Statement, condition, opening bracket, statements, semi-colon, and closing bracket. An else if statement extends the if statement. There are 3 descriptions that explains statement. The first statement executes if the first condition returns true. The second and third statements execute if one of the else if conditions return true. All of the conditions are evaluated using a top down approach.

For example, a top down approach using this syntax evaluates the if condition. When the if condition returns a false result then the program flow evaluates the first else if condition. After the first else if condition is evaluated, the program flow evaluates the second else if condition.

The same top down approach would continue if there were more else if conditions that returned a false result. Soon as a true condition is found, the statement associated with that true condition is executed and the remaining conditions are not evaluated.

Let’s provide a test since the if Statement is used to make a decision. We build our test by assigning a value to a variable such as int age = 34; Start by writing if. We have the option of writing our if statement from scratch or use intellisense. You can click CTRL + SPACE to bring up intellisense. We see an if and if else statement. I am going to select if and you see the syntax is already designed for us. The condition will be our test where our program flow must make a decision. For our condition, let’s go ahead and write if (age == 24). Remember from the 9th video Java Variables and Operators

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