Java 11 local variable samples

winterbe · winterbe · commit 81a0fa3aa1d6 · 2018-09-04T17:45:02.000+02:00
diff --git a/src/com/winterbe/java11/LocalVariableSyntax.java b/src/com/winterbe/java11/LocalVariableSyntax.java
@@ -0,0 +1,37 @@
+package com.winterbe.java11;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Predicate;
+
+public class LocalVariableSyntax {
+
+    public static void main(String[] args) {
+        var text = "Banana";
+//      Incompatible types:
+//      text = 1;
+
+
+//        Cannot infer type:
+//        var a;
+//        var nothing = null;
+//        var bla = () -> System.out.println("Hallo");
+//        var method = LocalVariableSyntax::someMethod;
+
+        var list1 = new ArrayList<>();   // ArrayList<Object>
+
+        var list2 = new ArrayList<Map<String, List<Integer>>>();
+
+        for (var current : list2) {
+            // current is of type: Map<String, List<Integer>>
+            System.out.println(current);
+        }
+
+        Predicate<String> predicate1 = (@Deprecated var a) -> false;
+
+    }
+
+    void someMethod() {}
+
+}
