Created
May 29, 2021 06:34
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Java11 - LVTI
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import java.util.Arrays; | |
import java.util.function.Predicate; | |
import java.util.stream.IntStream; | |
public class LocalVariableTypeInferenceClass { | |
//var cannot be used in class or instance variables | |
//static var classVar = 10; | |
//var instanceVar = 20; | |
public static void main(String[] args) { | |
//var can be used if compiler can figure out the value. | |
// Here it infers to an object of type int. | |
var aNumber = 5; | |
//var is not a datatype and not a keyword | |
var var = "Hello"; | |
//Infers to an object of type SomeClassWhichDoesSomething | |
var someClass = new SomeClassWhichDoesSomething(); | |
//compound declarations not allowed | |
//var a, b = 3; | |
//LVTI for lambda expression | |
var arr = new String[]{"Hello", "Hi", "Hey", "Heya", "Bye", "Hallo"}; | |
Predicate<String> longPredicate = (var x) -> x.equals("Bye"); | |
Arrays.stream(arr).anyMatch(longPredicate); | |
} | |
} | |
class SomeClassWhichDoesSomething { | |
int firstVar; | |
int secondVar; | |
} |
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