What is the valid data type for variable 'a' to print 'Hello World'?switch(a){ System.out.println('Hello World');}

What is the valid data type for variable "a" to print "Hello World"?

switch(a){
   System.out.println("Hello World");
}

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What is the valid data type for variable "a" to print "Hello World"?switch(a){ System.out.println("Hello World");}