Use java 17.

Use simple implementation for equals.

pom.xml

@@ -8,20 +8,10 @@
 	<packaging>jar</packaging>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<maven.compiler.source>11</maven.compiler.source>
-		<maven.compiler.target>11</maven.compiler.target>
+		<maven.compiler.source>17</maven.compiler.source>
+		<maven.compiler.target>17</maven.compiler.target>
 	</properties>
 	<dependencies>
-		<dependency>
-			<groupId>org.openjfx</groupId>
-			<artifactId>javafx-controls</artifactId>
-			<version>11</version>
-		</dependency>
-		<dependency>
-			<groupId>org.openjfx</groupId>
-			<artifactId>javafx-fxml</artifactId>
-			<version>11</version>
-		</dependency>
 		<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>

src/main/java/cz/jezek/lab11/Player.java

 package cz.jezek.lab11;
 
+import java.util.Objects;
+
 public class Player {
 
 	private String firstName;
@@ -34,33 +36,18 @@ public class Player {
 
 	@Override
 	public int hashCode() {
-		final int prime = 31;
-		int result = 1;
-		result = prime * result + ((firstName == null) ? 0 : firstName.hashCode());
-		result = prime * result + ((lastName == null) ? 0 : lastName.hashCode());
-		return result;
+		return Objects.hash(firstName, lastName);
 	}
 
 	@Override
 	public boolean equals(Object obj) {
 		if (this == obj)
 			return true;
-		if (obj == null)
-			return false;
-		if (getClass() != obj.getClass())
-			return false;
-		Player other = (Player) obj;
-		if (firstName == null) {
-			if (other.firstName != null)
-				return false;
-		} else if (!firstName.equals(other.firstName))
-			return false;
-		if (lastName == null) {
-			if (other.lastName != null)
-				return false;
-		} else if (!lastName.equals(other.lastName))
-			return false;
-		return true;
+		if (obj instanceof Player other) {
+			return Objects.equals(firstName, other.firstName) && Objects.equals(lastName, other.lastName);
+		}
+		return false;
+		
 	}
 
 	@Override

src/main/java/module-info.java

 module cz.jezek.lab10 {
-    requires transitive javafx.controls;
-    requires javafx.fxml;
-    opens cz.jezek.lab11 to javafx.fxml;
     exports cz.jezek.lab11;
 }
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