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Java 7 new feature - Using String literals in switch statements.

Updated on September 17, 2014

Introduction -

In this Java tutorial, you will learn concept related to Java 7 new feature. Java 7 has come up with some great features. In this tutorial, you will learn how to use String literals in Switch statements. Before Java 7, only integers were used in Switch statements. The integers can be of form byte, char, short etc. The use of String as a valid arguments in Switch statements makes it easy to remove chains of if statements. Multiple if conditions using String can be removed now by Switch statements using String. This feature has made code more readable and efficient for Java programmers. It helps in removing Java comments from the code. This tutorial has a video and highly commented Java code to demonstrate how to use String literals in Switch statement. Watch the video tutorial and follow 'steps to implement' section of this hub to get better understanding of the program.

Java video tutorial - Using String literals in Switch statement

Above, Java video tutorial provides complete walk through on how to use String literals in switch statements. Java 7 new feature has been demonstrated into this video tutorial. The source code explained in this video tutorial is been presented below. The code shown below is highly commented. The steps to implement is documented as comments in to the source code. It will help you in understanding video tutorial and source code.

Java source code - Using String literals in Switch statement - Eclipse Snapshot

Java source code - Using String literals in Switch statement - Eclipse Snapshot
Java source code - Using String literals in Switch statement - Eclipse Snapshot

Java 7 new feature code - Using String literals in Switch statement

// Import Scanner class present in java.util package.
// It helps in taking user inputs from the console.
import java.util.Scanner;

// Create a Java class. Here, Java class is named as 
// StringsInSwitch.
public class StringsInSwitch { 

	// Create main method, which is the starting point 
	// of execution of our program.
	public static void main(String[] args) {

		// Create a Scanner instance. It takes in a System.in 
		// as argument which reads user inputs from console.
		Scanner scanner = new Scanner(System.in); 

		// Ask the user a question as, Which is your favorate sports ?
		System.out.println("Which is your favorate sports ? ");

		// Using Scanner class nextLine method take String entered
		// by user and assign it to sports variable.
		String sports = scanner.nextLine();	

		// Apply Java 7 new feature - Using String literals in switch statement.
		// Here, based on sports String different cases are executed. 
		switch(sports) {

		// If user enters as Cricket, Football, BasketBall below cases are 
		// mapped and respective code is executed, else default code is 
		// executed.
		case "Cricket":
			System.out.println("You chose Cricket");
			break;

		case "Football":
			System.out.println("You chose Football");
			break;

		case "Basketball":
			System.out.println("You chose Basketball");
			break;

		default:
			System.out.println("Wrong selection");
		}		
	}
}

Steps to implement -

Step 1 - Import Scanner class present in java.util package. It helps in taking user inputs from the console.

Step 2 - Create a Java class. Here, Java class is named as StringsInSwitch.

Step 3 - Create main method, which is the starting point of execution of our program.

Step 4 - Create a Scanner instance. It takes in a System.in as argument which reads user inputs from console.

Step 5 - Ask the user a question as, Which is your favorate sports ?

Step 6 - Using Scanner class nextLine method take String entered by user and assign it to sports variable.

Step 7 - Apply Java 7 new feature - Using String literals in switch statement. Here, based on sports String different cases are executed. Switch statement is created based on sports String variable. This switch statement has various cases with a String values such as, Cricket, Football, Basketball. It has print statements and break keyword. The break is used to terminate switch statement, or else after executing a particular case next case starts executing and ends after executing default statements below.

Step 8 - If user enters as Cricket, Football, Basketball respective cases are mapped and respective code is executed, else default code is executed.

Output of the program -

Output of the program - Using String literals in Switch statement - Eclipse Snapshot
Output of the program - Using String literals in Switch statement - Eclipse Snapshot
Output of the program - Using String literals in Switch statement - Eclipse Snapshot
Output of the program - Using String literals in Switch statement - Eclipse Snapshot
Output of the program - Using String literals in Switch statement - Eclipse Snapshot
Output of the program - Using String literals in Switch statement - Eclipse Snapshot

Output of the program - Explanation

On running above Java code, the user is asked a question "Which is your favorite sports ?". When user enters 'Cricket' and press enter key. It prints "You chose Cricket". When user enters Cricket, the switch statement having case as Cricket gets executed. When user enters 'Football' and press enter key. It prints "You chose Football". When user enters Football, the switch statement having case as Football gets executed. When user enters 'Rugby' and press enter key. It prints "Wrong selection". When user enters Rugby, the switch statement having case as default gets executed. If no case matches the string passed than default block gets executed.

Conclusion -

With coming of Java 7, String literals in switch statements feature is been widely used. It has removed series of if statements based on String. It has made code more efficient and readable. Instead of having groups of if statements, a single switch statement is used having a String as a case condition. Hope you like this Java tutorial !!!. Please do rate and comment below.

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