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Copy pathLocalVariableInLambda.java
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34 lines (27 loc) · 894 Bytes
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package java11;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
/*
* var instroduced for Lambada parameter in Java 11
why ?
*/
public class LocalVariableInLambda {
private static void varLambdaParameter() {
List<String> list = Arrays.asList("a", "b", "c");
String result = list.stream().map((var x) -> x.toUpperCase()).collect(Collectors.joining(","));
System.out.println(result);
}
// why ?
// @NonNull is either used by a validation framework
private static void varLambdaParameterWhy() {
List<String> list = Arrays.asList("a", "b", "c", null);
// NOW WE CAN ADD ANNOTATION ALSO eg. @NotNull
String result = list.stream().map((@NotNull var x) -> x.toUpperCase()).collect(Collectors.joining(","));
System.out.println(result);
}
public static void main(String[] args) {
varLambdaParameter();
varLambdaParameterWhy();
}
}