Technology & Computing

What is the difference between switch case and if else?

By: Shivani AtreUpdated: February 15, 2021

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Key Differences Between if-else and switch
Expression inside if statement decide whether to execute the statements inside if block or under else block. On the other hand, expression inside switch statement decide which case to execute. You can have multiple if statement for multiple choice of statements.

Keeping this in view, what is the difference between switch and if statement in Java?

The if statement is used to select among two alternatives. It uses a boolean expression to decide which of the alternative should be executed. The switch statement is used to select among multiple alternatives. It uses an expression to determine which alternative should be executed.

Subsequently, question is, can we use if else in switch case?

Switch with if, else if, else, and loops inside case. Let's say value is currently 1, we go to case 1 and our for loop goes through the array to see if each element matches with the whatever_value variable. In this case if it does, we declare the value variable to be equal to 2, and we break out of the loop.

Which is faster switch case or if else?

As it turns out, the switch statement is faster in most cases when compared to if-else , but significantly faster only when the number of conditions is large. The primary difference in performance between the two is that the incremental cost of an additional condition is larger for if-else than it is for switch .

Why is switch better than if else?

switch vs if else. A switch statement is usually more efficient than a set of nested ifs. The compiler can do this because it knows that the case constants are all the same type and simply must be compared for equality with the switch expression, while in case of if expressions, the compiler has no such knowledge.

Related

Why do we use switch case?

Switch statements are used when you clearly know what are possible values for the condition variable. Each value in that list of possible value is called case. When the value given in input matches the value in the case statement, the block of code below case gets executed until it reaches the break statement.

Is else if faster than if?

In general, "else if" style can be faster because in the series of ifs, every condition is checked one after the other; in an "else if" chain, once one condition is matched, the rest are bypassed.

What is if and if else statement?

Definition and Usage
The if/else statement executes a block of code if a specified condition is true. If the condition is false, another block of code can be executed. The if/else statement is a part of JavaScript's "Conditional" Statements, which are used to perform different actions based on different conditions.

Is switch faster than if else Java?

With switch the JVM loads the value to compare and iterates through the value table to find a match, which is faster in most cases. A switch statement is not always faster than an if statement. It scales better than a long list of if-else statements as switch can perform a lookup based on all the values.

What is switch statement example?

Switch statement tests the value of a variable and compares it with multiple cases. Once the case match is found, a block of statements associated with that particular case is executed. Each case in a block of a switch has a different name/number which is referred to as an identifier.

Which one is better switch case or else if ladder?

The switch case is more compact than lot of nested else if. Another difference between switch case and else if ladder is that the switch statement is considered to be less flexible than the else if ladder, because it allows only testing of a single expression against a list of discrete values.

Are switch statements Bad?

Switch case is not a bad syntax, but its usage in some cases categorizes it under code smell. It is considered a smell, if it is being used in OOPS. Thus, Switch case should be used very carefully.

What is the purpose of break statement?

When a break statement is encountered inside a loop, the loop is immediately terminated and the program control resumes at the next statement following the loop. It can be used to terminate a case in the switch statement (covered in the next chapter).

Should I use switch or if?

Use switch instead of if when: You are comparing multiple possible conditions of an expression and the expression itself is non-trivial. You have multiple values that may require the same code. You have some values that will require essentially all of another value's execution, plus only a few statements.

How do you write a switch case in Java?

The Java switch expression must be of byte, short, int, long (with its Wrapper type), enums and string. Each case statement can have a break statement which is optional.

Syntax:
  1. switch(expression){
  2. case value1:
  3. //code to be executed;
  4. break; //optional.
  5. case value2:
  6. //code to be executed;
  7. break; //optional.

What are the various types of errors in Java?

There are three kinds of errors: syntax errors, runtime errors, and logic errors. These are errors where the compiler finds something wrong with your program, and you can't even try to execute it.

What are jump statements in Java?

In Java jump statements are mainly used to transfer control to another part of our program depending on the conditions. These statements can be used to jump directly to other statements, skip a specific statement and so on. In Java we have the following three jump statements: break (simple and labeled) continue.

What is if else if statement in Java?

if-else statement in java. An if statement can be followed by an optional else statement, which executes when the Boolean expression is false.

Can a switch statement be written without a default case?

select switch, "Switch statement does not have a default case." A switch statement without a default case may allow execution to 'fall through' silently, if no cases are matched.

What is the default case?

A switch statement can have an optional default case, which must appear at the end of the switch. The default case can be used for performing a task when none of the cases is true. No break is needed in the default case.

How do you convert if else to switch?

To convert if statement to switch statement
Position the caret on the if which you'd like to be converted to switch statement. Select Convert if to switch statement from the VisualAid's Fixes menu.