From 3539f928b60a07b7b13cb3d92ea6577da2630624 Mon Sep 17 00:00:00 2001
From: datahaki <jan.hakenberg@gmail.com>
Date: Tue, 3 Oct 2023 22:24:33 +0200
Subject: [PATCH] v21

---
 .github/workflows/mvn_test.yml                          | 6 +++---
 pom.xml                                                 | 2 +-
 src/test/java/ch/alpine/subare/book/ch01/tic/Agent.java | 3 +--
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/mvn_test.yml b/.github/workflows/mvn_test.yml
index 09ec626c..84814e2f 100644
--- a/.github/workflows/mvn_test.yml
+++ b/.github/workflows/mvn_test.yml
@@ -1,4 +1,4 @@
-name: mvn test with JDK 20
+name: mvn test with JDK 21
 on:
   push:
     paths:
@@ -12,10 +12,10 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
-      - name: Set up JDK 20
+      - name: Set up JDK 21
         uses: actions/setup-java@v2
         with:
-          java-version: '20'
+          java-version: '21'
           distribution: 'temurin'
       - name: mvn install tensor
         working-directory: .
diff --git a/pom.xml b/pom.xml
index de6efa9c..cfc4a1a9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -67,7 +67,7 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.11.0</version>
 				<configuration>
-					<release>17</release>
+					<release>21</release>
 				</configuration>
 			</plugin>
 			<plugin>
diff --git a/src/test/java/ch/alpine/subare/book/ch01/tic/Agent.java b/src/test/java/ch/alpine/subare/book/ch01/tic/Agent.java
index 29381483..51eff0f6 100755
--- a/src/test/java/ch/alpine/subare/book/ch01/tic/Agent.java
+++ b/src/test/java/ch/alpine/subare/book/ch01/tic/Agent.java
@@ -41,8 +41,7 @@ final void feedState(State state) {
 
   // update estimation according to reward
   final void feedReward(double reward) {
-    Collections.reverse(states);
-    for (State latestState : states) {
+    for (State latestState : states.reversed()) {
       double value = estimation.get(latestState) //
           + stepSize * (reward - estimation.get(latestState));
       estimation.put(latestState, value);