Switch Case Java String Null

Unlike if then and if then else statements the switch statement can have a number of possible execution paths.

Switch case java string null. Java switch and null s. Java switch case uses string equals method to compare the passed value with case values so make sure to add a null check to avoid nullpointerexception. Public class program public static void main. After java 7 release switch statement support string class also.

In java null s may show up in switch statement when we switch on primitive type wrappers like integer or on string or on enum type. Character byte short and integer discussed in numbers and strings. In that case java will throw nullpointerexception as is demonstrated by program. According to java 7 documentation for strings in switch java compiler generates more efficient byte code for string in switch statement than chained if else if statements.

Java switch case with string is more readable than the multiple if else if else blocks. Important points for string in switch case. It also works with enumerated types discussed in enum types the string class and a few special classes that wrap certain primitive types. The switch case matching is case sensitive so java will not match for input string java.

A switch works with the byte short char and int primitive data types. Switch statement existed before java 7 as well but it supported only int and enum types. If the input string is null switch case will throw nullpointerexception. Therefore it is best to switch on strings only in cases in which the controlling data is already in string form.

String should not be null.