Since: Jdk 1.7
public class SwitchStringExample {
public static void main(String[] args) {
String
day = callSwich("Monday");
System.out.println(day);
/**
NullPointerException */
day
= callSwich(null);
System.out.println(day);
}
private static String callSwich(String day) {
String typeOfDay;
switch (day) {
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" + day);
}
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 bytecode from switch statements that use String objects than from chained if-then-else statements.
Note:
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