Posted on Feb 3

Day17; Switch Statements & Ternary Operator

Switch Statements:

==> The switch statement in Java is a multi-way branch statement.

==> In simple words, the Java switch statement executes one
statement from multiple conditions

Syntax:

switch(expression) { case value1 : // Statements break; // break is optional case value2 : // Statements break; // break is optional .... .... .... default : // default Statement }

Example Program:

// Class public class Days { public static void main(String[] args) { int day = 5; String dayString; // Switch statement with int data type switch (day) { case 1: dayString = "Monday"; break; case 2: dayString = "Tuesday"; break; case 3: dayString = "Wednesday"; break; case 4: dayString = "Thursday"; break; case 5: dayString = "Friday"; break; case 6: dayString = "Saturday"; break; case 7: dayString = "Sunday"; break; // Default case default: dayString = "Invalid day"; } System.out.println(dayString); } }

Output:

 Friday

Default Ex pr:

public class Days { public static void main(String[] args) { int day = 8; String dayString; // Switch statement with int data type switch (day) { case 1: dayString = "Monday"; break; case 2: dayString = "Tuesday"; break; case 3: dayString = "Wednesday"; break; case 4: dayString = "Thursday"; break; case 5: dayString = "Friday"; break; case 6: dayString = "Saturday"; break; case 7: dayString = "Sunday"; break; // Default case default: dayString = "Invalid day"; } System.out.println(dayString); } }

Output:

 Invalid day

Ternary Operator :

==> Ternary operator is the only operator in java that takes three operands.

==> A ternary operator starts with a condition followed by a question mark (?), then an expression to execute if the condition is ‘true; followed by a colon (:), and finally the expression to execute if the condition is ‘false’.

==> This operator is frequently used as a one line replacement for if…else statement.

Syntax of Ternary Operator:

variable = Condition ? Expression1: Expression2

Example program:

public class JavaExample { public static void main(String[] args) { // declared and initialized a int variable int num = -101; //Using ternary operator, we are assigning the "Positive" //or "Negative" String value to the String variable 'sign' //If num>0 then "Positive" is assigned to 'sign' else "Negative" String sign = (num > 0) ? "Positive" : "Negative"; //Display output System.out.println(num+ " is a "+sign+ " Number"); } }