Conditionals and Control Flow
If-Then Statement

The if-then statement is the most simple control flow we can write. It tests an expression for truth and executes some code based on it.

if (flip == 1) { System.out.println("Heads!"); }
  • The if keyword marks the beginning of the conditional statement, followed by parentheses ().
  • The parentheses hold a boolean datatype.

For the condition in parentheses we can also use variables that reference a boolean, or comparisons that evaluate to a boolean.

The boolean condition is followed by opening and closing curly braces that mark a block of code. This block runs if, and only if, the boolean is true.

boolean isValidPassword = true; if (isValidPassword) { System.out.println("Password accepted!"); } // Prints "Password accepted!" int numberOfItemsInCart = 9; if (numberOfItemsInCart > 12) { System.out.println("Express checkout not available"); } // Nothing is printed.

If a conditional is brief we can omit the curly braces entirely:

if (true) System.out.println("Brevity is the soul of wit");

Note: Conditional statements do not end in a semicolon.



The code editor contains an Order class to track retail shipments.

Write an if-then statement that prints High value item! when itemCost is greater than 24.00.

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