在java 7中切换忽略大小写

Question

I am doing a POC on Java 7 new features. I have code to use String in switch statement and it works. I want to make it work in case insensitive also. Is there a way to check out with ignoreCase on String?

package com.java.j7;

public class Test {
    final private String _NEW ="NEW";
    final private String _PENDING = "PENDING";
    final private String _CLOSED = "CLOSED";
    final private String _REJECTED ="REJECTED";

public static void main(String... strings){

    Test j = new Test();
    j.processItem("new");
    j.processItem("pending");
    j.processItem("closed");
    j.processItem("rejected");

}

void processItem(String s){
    switch (s) {
    case _NEW:
        System.out.println("Matched to new");
        break;
    case _PENDING:
        System.out.println("Matched to pending");
        break;
    case _CLOSED:
        System.out.println("Matched to closed");
        break;
    case _REJECTED:
        System.out.println("Matched to rejected");
        break;

    default:
        System.out.println("Not matching any more");
        break;
    }

}
}

Answer 1

no, but you could switch on s.toUpperCase() . so:

switch (s.toUpperCase()) {
   //same as before
}

and while we're nitpicking, you better upper-case things in the english locale to avoid issues with turkish

Answer 2

using String in switch Example from oracle docs Using Strings in switch Statements

 public class StringSwitchDemo {

        public static int getMonthNumber(String month) {

            int monthNumber = 0;

            if (month == null) {
                return monthNumber;
            }

            switch (month.toLowerCase()) {
                case "january":
                    monthNumber = 1;
                    break;
                case "february":
                    monthNumber = 2;
                    break;
                case "march":
                    monthNumber = 3;
                    break;
                case "april":
                    monthNumber = 4;
                    break;
                case "may":
                    monthNumber = 5;
                    break;
                case "june":
                    monthNumber = 6;
                    break;
                case "july":
                    monthNumber = 7;
                    break;
                case "august":
                    monthNumber = 8;
                    break;
                case "september":
                    monthNumber = 9;
                    break;
                case "october":
                    monthNumber = 10;
                    break;
                case "november":
                    monthNumber = 11;
                    break;
                case "december":
                    monthNumber = 12;
                    break;
                default: 
                    monthNumber = 0;
                    break;
            }

            return monthNumber;
        }

        public static void main(String[] args) {

            String month = "August";

            int returnedMonthNumber =
                StringSwitchDemo.getMonthNumber(month);

            if (returnedMonthNumber == 0) {
                System.out.println("Invalid month");
            } else {
                System.out.println(returnedMonthNumber);
            }
        }
    }

Answer 3

From oracle docs switch with string

The String in the switch expression is compared with the expressions associated with each case label as if the String#equals method were being used.

You can use

switch(s.toUpperCase()){
...
.....
}

See also

• String#toUpperCase