Merge pull request #33 from trishagee/main

.github/workflows/maven.yml

@@ -16,10 +16,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 21
+      - name: Set up JDK 23
         uses: actions/setup-java@v2
         with:
-          java-version: 21
+          java-version: 23
           distribution: 'temurin'
       - name: Build Java examples with Maven
         run: mvn -B verify --file java-samples/pom.xml

java-samples/pom.xml

@@ -9,7 +9,7 @@
     <version>1.0-SNAPSHOT</version>
 
     <properties>
-        <java.version>21</java.version>
+        <java.version>23</java.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>

java-samples/src/main/java/com/jetbrains/code/jdk22/ImplicitlyDeclaredClass.java

@@ -0,0 +1,4 @@
+
+void main() {
+    System.out.println("Hello, World!");
+}

java-samples/src/main/java/com/jetbrains/code/jdk22/UnnamedVariables.java

@@ -0,0 +1,37 @@
+package com.jetbrains.code.jdk22;
+
+import com.jetbrains.entity.Order;
+
+import java.awt.Point;
+import java.util.Collection;
+import java.util.List;
+import java.util.concurrent.ArrayBlockingQueue;
+
+public class UnnamedVariables {
+    static int suggestReplacingUnusedVariableWithUnderscore(Iterable<Order> orders) {
+        int total = 0;
+        for (Order order : orders)    // order is unused
+            total++;
+        return total;
+    }
+
+    static void demoUseOfUnderscore() {
+        var q = new ArrayBlockingQueue<Integer>(3, true, List.of(1, 2, 3));
+        while (q.size() >= 3) {
+            int x = q.remove();
+            int y = q.remove();
+            int _ = q.remove();            // z is unused
+            new Point(x, y);
+        }
+    }
+
+    static int demoUseOfUnderscoreInException() {
+        String s = "Some string";
+        try {
+            return Integer.parseInt(s);
+        } catch (NumberFormatException _) {
+            System.out.println("Bad number: " + s);
+            return 0;
+        }
+    }
+}

java-samples/src/main/java/com/jetbrains/code/jdk23/PrimitiveTypesInSwitch.java

@@ -0,0 +1,20 @@
+package com.jetbrains.code.jdk23;
+
+public class PrimitiveTypesInSwitch {
+    private void type(Message x) {
+        switch (x.getStatus()) {
+            case 0 -> System.out.println("okay");
+            case 1 -> System.out.println("warning");
+            case 2 -> System.out.println("error");
+            default -> System.out.println("unknown status: " + x.getStatus());
+        }
+    }
+
+    private static class Message {
+        private int status;
+
+        public int getStatus() {
+            return status;
+        }
+    }
+}

java-samples/src/main/java/com/jetbrains/inspections/Deprecation.java

@@ -6,8 +6,6 @@ public class Deprecation {
     private void deprecationWarnings() {
         Thread.currentThread().stop();
 
-        Thread.currentThread().countStackFrames();
-
         final MyClass myClass = new MyClass();
         myClass.deprecatedMethod();
     }