19F. Java Basics for Selenium - If Else and Switch Case Interview Questions

What is the difference between an if statement and a switch statement?
An if-then-else statement is preferable when we need to check ranges of values or multiple conditions.
A switch statement is better suited when testing a single variable against many single values. If you have to use relational or logical operators then you can’t use switch case.
Describe the if-then and if-then-else statements. What types of expressions can be used as conditions?
Both statements tell our program to execute the code inside of them only if a particular condition evaluates to true. However, the if-then-else statement provides a secondary path of execution in case the if clause evaluates to false.
Describe the switch statement. What object types can be used in the switch clause?
Switch allows the selection of several execution paths based on a variables’ value.
Each path is labelled with case or default, the switch statement evaluates each case expression for a match and executes all statements that follow the matching label until a break statement is found. If it can’t find a match, the default block will be executed instead
What happens when we forget to put a break statement in a case clause of a switch?
This means that it will continue the execution of all case labels until if finds a break statement, even though those labels don’t match the expression’s value.
Can we use Switch statement with Strings?
Prior to Java 7 we can use only int values and enum constants in Switch. Starting with Java 7 we can use strings in Switch statement. If we use strings in switch statement prior to Java 7 we will get compile time error “only int and enum constants are permitted”.