// enumerations/SmartCasting.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// {NewFeature} Since JDK 16

public class SmartCasting {

static void dumb(Object x) {

if(x instanceof String) {

String s = (String)x;

if(s.length() > 0) {

System.out.format(

"%d %s%n", s.length(), s.toUpperCase());

}

}

}

static void smart(Object x) {

if(x instanceof String s && s.length() > 0) {

System.out.format(

"%d %s%n", s.length(), s.toUpperCase());

}

}

static void wrong(Object x) {

// "Or" never works:

// if(x instanceof String s || s.length() > 0) {}

// error: cannot find symbol ^

}

public static void main(String[] args) {

dumb("dumb");

smart("smart");

}

}

/* Output:

4 DUMB

5 SMART

*/