Perform "Switch-case" on String in Java

0 votes
Why can't I switch on a String?

Is this functionality going to be put into a later Java version?

Can someone explain why I can't do this, as in, the technical way Java's switch statement works?
May 8, 2018 in Java by Akrati
• 3,150 points
50 views

1 answer to this question.

0 votes

Switches based on integers can be optimized to very efficent code. Switches based on other data type can only be compiled to a series of if() statements.

For that reason C & C++ only allow switches on integer types, since it was pointless with other types.

The designers of C# decided that the style was important, even if there was no advantage.

The designers of Java apparently thought like the designers of C.

An example of direct String usage since 1.7 may be shown as well:

public static void main(String[] args) {

    switch (args[0]) {
        case "Monday":
        case "Tuesday":
        case "Wednesday":
            System.out.println("boring");
            break;
        case "Thursday":
            System.out.println("getting better");
        case "Friday":
        case "Saturday":
        case "Sunday":
            System.out.println("much better");
            break;
    }

}
answered May 8, 2018 by Rishabh
• 3,540 points

Related Questions In Java

0 votes
1 answer

How can I convert a String variable to a primitive int in Java

You can convert a String to int by using a function: int ...READ MORE

answered Apr 12, 2018 in Java by sharth
• 3,320 points
107 views
0 votes
4 answers

Remove extra spaces from string in java

import java.util.regex.Matcher; import java.util.regex.Pattern; String pattern="[\\s]"; String replace=""; part="name=john age=13 year=2001"; Pattern ...READ MORE

answered Sep 10, 2018 in Java by parth295
• 4,600 points
72 views
0 votes
3 answers

How to reverse a string in java?

public static String reverse(String s) { ...READ MORE

answered Aug 16, 2018 in Java by samarth295
• 2,190 points
72 views
0 votes
1 answer

How can I convert an 'ArrayList<String> to 'String[]' in Java

List<String> list = new ArrayList<String>(); String[] array = ...READ MORE

answered Apr 20, 2018 in Java by Daisy
• 8,040 points
142 views
0 votes
3 answers

Check if a String is numeric in Java

Java 8 Lambda Expression is used: String someString ...READ MORE

answered Sep 3, 2018 in Java by Daisy
• 8,040 points
603 views
0 votes
2 answers

Generate an alpha-numeric string randomly

Java supplies a way of doing this ...READ MORE

answered Jul 18, 2018 in Java by Daisy
• 8,040 points
157 views
0 votes
1 answer

How do I create a Java string from the contents of a file?

If you're looking for an alternative that ...READ MORE

answered Apr 19, 2018 in Java by Rishabh
• 3,540 points
80 views
0 votes
2 answers

Counting no of Occurrence of a particular character inside a string in Java

We can find out the no. of ...READ MORE

answered Sep 7, 2018 in Java by Sushmita
• 6,850 points
219 views
0 votes
2 answers

Integer to String conversion in java

We can do this in 2 ways: String ...READ MORE

answered Jul 27, 2018 in Java by samarth295
• 2,190 points
64 views
0 votes
3 answers

String to Double conversion in java

Double temp = Double.valueOf(str); number = temp.doubleValue(); READ MORE

answered Sep 10, 2018 in Java by Sushmita
• 6,850 points
42 views