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Wednesday, May 14, 2014

Features of Java 7

Using Strings in switch Statements

Do you know , In the JDK 7 release, you can use a String object in the expression of a switch statement:


public String getTypeOfDayWithSwitchStatement(String dayOfWeekArg) {

     String typeOfDay;

     switch (dayOfWeekArg) {

         case "Monday":

             typeOfDay = "Start of work week";

             break;

         case "Tuesday":

         case "Wednesday":

         case "Thursday":

             typeOfDay = "Midweek";

             break;

         case "Friday":

             typeOfDay = "End of work week";

             break;

         case "Saturday":

         case "Sunday":

             typeOfDay = "Weekend";

             break;

         default:

      throw new IllegalArgumentException("Invalid day of the week: " + dayOfWeekArg);

     }

     return typeOfDay;

}

The switch statement compares the String object in its expression with the       expressions associated with each case label as if it were using the String.equals method; consequently, the comparison of String objects in switch statements is case sensitive. The Java compiler generates generally more efficient byte code from switch statements that use String objects than from chained if-then-else statements.


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