Add java11-features module: runnable demos and captured output for the ankurm.com java11-features article

2026-10-20 17:13:58 +00:00
parent 77c782abbf
commit 8b9447a393
19 changed files with 223 additions and 0 deletions
@@ -0,0 +1,7 @@
+$ javac src/StringMethods.java && java StringMethods     (11.0.32.1)
+trim() length   : 9
+strip() length  : 5
+isBlank("  ")   : true   isEmpty: false
+lines()         : [a, b, c]
+repeat(3)       : ababab
+stripLeading    : [x ]  stripTrailing: [  x]
@@ -0,0 +1,3 @@
+$ javac src/FilesDemo.java && java FilesDemo     (11.0.32.1)
+read back       : one|two|three
+Path.of         : a/b/c.txt
@@ -0,0 +1,4 @@
+$ javac src/HttpClientDemo.java && java HttpClientDemo     (11.0.32.1)
+sync            : 200 hello from server version=HTTP_1_1
+header          : X-Demo=yes
+async           : hello from server
@@ -0,0 +1,3 @@
+$ javac src/VarLambda.java && java VarLambda     (11.0.32.1)
+(var a, var b)  : 5
+with annotation : x-y
@@ -0,0 +1,2 @@
+$ java src/SingleFile.java     (11.0.32.1)
+launched from source, java.version=11.0.32.1
@@ -0,0 +1,4 @@
+$ javac src/NestMates.java && java NestMates     (11.0.32.1)
+nest host       : NestMates
+inner can read  : 42
+access$ methods on outer: 0
@@ -0,0 +1,20 @@
+$ javac broken/JaxbRemoved.java     (1.8.0_504)
+(compiled cleanly)
+
+$ javac broken/JaxbRemoved.java     (11.0.32.1)
+broken/JaxbRemoved.java:1: error: package javax.xml.bind does not exist
+import javax.xml.bind.JAXBContext;
+                     ^
+broken/JaxbRemoved.java:6: error: cannot find symbol
+        System.out.println(JAXBContext.class.getName());
+                           ^
+  symbol:   class JAXBContext
+  location: class JaxbRemoved
+2 errors
+
+$ javac broken/VarWithoutLambda.java     (11.0.32.1)
+broken/VarWithoutLambda.java:6: error: invalid lambda parameter declaration
+        BiFunction<Integer, Integer, Integer> f = (var a, Integer b) -> a + b;
+                                                  ^
+  (cannot mix 'var' and explicitly-typed parameters)
+1 error
@@ -0,0 +1,33 @@
+# trim vs strip on the same string, Java 8 has no strip(); the Java 8 compile of src/StringMethods.java:
+$ javac src/StringMethods.java     (1.8.0_504)
+src/StringMethods.java:9: error: cannot find symbol
+        System.out.println("strip() length  : " + padded.strip().length());
+                                                        ^
+  symbol:   method strip()
+  location: variable padded of type String
+src/StringMethods.java:10: error: cannot find symbol
+        System.out.println("isBlank(\"  \")   : " + "  ".isBlank() + "   isEmpty: " + "  ".isEmpty());
+                                                        ^
+  symbol:   method isBlank()
+  location: class String
+src/StringMethods.java:11: error: cannot find symbol
+        System.out.println("lines()         : " + "a\nb\r\nc".lines().collect(Collectors.toList()));
+                                                             ^
+  symbol:   method lines()
+  location: class String
+src/StringMethods.java:12: error: cannot find symbol
+        System.out.println("repeat(3)       : " + "ab".repeat(3));
+                                                      ^
+  symbol:   method repeat(int)
+  location: class String
+src/StringMethods.java:13: error: cannot find symbol
+        System.out.println("stripLeading    : [" + "  x ".stripLeading() + "]  stripTrailing: [" + "  x ".stripTrailing() + "]");
+                                                         ^
+  symbol:   method stripLeading()
+  location: class String
+src/StringMethods.java:13: error: cannot find symbol
+        System.out.println("stripLeading    : [" + "  x ".stripLeading() + "]  stripTrailing: [" + "  x ".stripTrailing() + "]");
+                                                                                                         ^
+  symbol:   method stripTrailing()
+  location: class String
+6 errors