using switch in strings

Question

Trying to use switch in strings by first coverting string into char and then apply switch but still didnt done it....here is my code..

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import javax.swing.JOptionPane;

class HappyBirthday {

    public static void main(String[] args) throws IOException {
        String Month;
        char[] Months = Month.toCharArray();
        BufferedReader dataIn = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Please enter your month.");

        Month = JOptionPane.showInputDialog("enter month");
        String month1 = { "January", "feb"};
        char[] month2 = month1.toCharArray();

        // String s=month1.equals(Month);
        // System.out.print(month2Array[0]);
        switch (month2) {

        case 0:
            System.out.println("kool");
            break;

        case 1:
            System.out.println("not kool");
            break;
        default:
        }
    }
}
/**
 * if (month1[1].equals(Month)) System.out.println("kool"); else
 * if(month1[0].equals(Month)) System.out.println("kooooooooooooool"); else
 * System.out.println("Big kooooool");
 **/

I was pretty close to downvoting the question just because the code formatting is a desaster! Please, for the next time, take a minute an clean it up before posting. — Andreas Dolk
– Andreas Dolk, Commented May 29, 2010 at 9:59

Bozhidar Batsov · Accepted Answer · 2010-05-29 09:57:28Z

4

Have a look at this excellent article on the subject.

answered May 29, 2010 at 9:57

Bozhidar Batsov

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polygenelubricants · Accepted Answer · 2010-05-29 10:33:51Z

Currently, you can not switch on a String. The language specification is clear on what you can switch on:

JLS 14.11 The `switch` statement

SwitchStatement:
      switch ( Expression ) SwitchBlock
The type of the Expression must be char, byte, short, int, Character, Byte, Short, Integer, or an enum type, or a compile-time error occurs.

Depending on what you want to do, you can switch on each char of a String:

    String s = "Coffee, tea, or me?";
    int vowelCount = 0;
    int punctuationCount = 0;
    int otherCount = 0;
    for (char letter : s.toUpperCase().toCharArray()) {
        switch (letter) {
            case 'A': 
            case 'E':
            case 'I':
            case 'O':
            case 'U':
                vowelCount++;
                break;
            case ',':
            case '.':
            case '?':
                punctuationCount++;
                break;
            default:
                otherCount++;
        }
    }
    System.out.printf("%d vowels, %d punctuations, %d others",
        vowelCount, punctuationCount, otherCount
    ); // prints "7 vowels, 3 punctuations, 9 others"

Bill the Lizard · Accepted Answer · 2012-08-01 04:25:37Z

1

Note that switching on strings will be supported in Java 7.

edited Aug 1, 2012 at 4:25

Bill the Lizard

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answered May 29, 2010 at 10:04

Brian Agnew

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1 Comment

Stephen C Over a year ago

According to the changelogs, this code has made it into the codebase. bugs.sun.com/view_bug.do?bug_id=6827009

Andreas Dolk · Accepted Answer · 2010-05-29 10:01:57Z

0

You can't switch on a char[] type. Switch on char[0] and use case 'J': and so on (although - because some months start with the same letter, the algorithm would be sub-optimal)

answered May 29, 2010 at 10:01

Andreas Dolk

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