The Conditional Operator

The Conditional Operator

üJava has a conditional operator that evaluates a boolean condition that determines which of two other expressions is evaluated

üThe result of the chosen expression is the result of the entire conditional operator

üIts syntax is:

ü  condition ? expression1 : expression2

üIf the condition is true, expression1 is evaluated;  if it is false, expression2 is evaluated.

The Conditional Operator

üThe conditional operator is similar to an if-else statement, except that it forms an expression that returns a value

üFor example:

ü  larger = ((num1 > num2) ? num1 : num2);

ü    if (num1 > num2)

  larger = num1;

else

  larger = num2;

üThe conditional operator is ternary because it requires three operands.

The Conditional Operator

üAnother example:

   System.out.println ("Your change is " + count +

           ((count == 1) ? "Dime" : "Dimes"));

If count equals 1, then "Dime" is printed

If count is anything other than 1, then "Dimes" is printed.

Repetition Statements

üRepetition statements allow us to execute a statement multiple times

üOften they are referred to as loops

üLike conditional statements, they are controlled by boolean expressions

üJava has three kinds of repetition statements:

üthe while loop

üthe do loop

üthe for loop

üThe programmer should choose the right kind of loop for the situation