[templates] Add Java template for educational robot (#3309)

Educational robot is a very minimal template designed for educational use
(rather than competition).

wpilibjExamples/src/main/java/edu/wpi/first/wpilibj/templates/educational/EducationalRobot.java

@@ -0,0 +1,77 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+package edu.wpi.first.wpilibj.templates.educational;
+
+import edu.wpi.first.hal.HAL;
+import edu.wpi.first.wpilibj.RobotBase;
+
+/** Educational robot base class. */
+public class EducationalRobot extends RobotBase {
+  public void robotInit() {}
+
+  public void disabled() {}
+
+  public void run() {}
+
+  public void autonomous() {
+    run();
+  }
+
+  public void teleop() {
+    run();
+  }
+
+  public void test() {
+    run();
+  }
+
+  private volatile boolean m_exit;
+
+  @SuppressWarnings("PMD.CyclomaticComplexity")
+  @Override
+  public void startCompetition() {
+    robotInit();
+
+    // Tell the DS that the robot is ready to be enabled
+    HAL.observeUserProgramStarting();
+
+    while (!Thread.currentThread().isInterrupted() && !m_exit) {
+      if (isDisabled()) {
+        m_ds.InDisabled(true);
+        disabled();
+        m_ds.InDisabled(false);
+        while (isDisabled()) {
+          m_ds.waitForData();
+        }
+      } else if (isAutonomous()) {
+        m_ds.InAutonomous(true);
+        autonomous();
+        m_ds.InAutonomous(false);
+        while (isAutonomousEnabled()) {
+          m_ds.waitForData();
+        }
+      } else if (isTest()) {
+        m_ds.InTest(true);
+        test();
+        m_ds.InTest(false);
+        while (isTest() && isEnabled()) {
+          m_ds.waitForData();
+        }
+      } else {
+        m_ds.InOperatorControl(true);
+        teleop();
+        m_ds.InOperatorControl(false);
+        while (isOperatorControlEnabled()) {
+          m_ds.waitForData();
+        }
+      }
+    }
+  }
+
+  @Override
+  public void endCompetition() {
+    m_exit = true;
+  }
+}

wpilibjExamples/src/main/java/edu/wpi/first/wpilibj/templates/educational/Main.java

@@ -0,0 +1,25 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+package edu.wpi.first.wpilibj.templates.educational;
+
+import edu.wpi.first.wpilibj.RobotBase;
+
+/**
+ * Do NOT add any static variables to this class, or any initialization at all. Unless you know what
+ * you are doing, do not modify this file except to change the parameter class to the startRobot
+ * call.
+ */
+public final class Main {
+  private Main() {}
+
+  /**
+   * Main initialization function. Do not perform any initialization here.
+   *
+   * <p>If you change your main robot class, change the parameter type.
+   */
+  public static void main(String... args) {
+    RobotBase.startRobot(Robot::new);
+  }
+}

wpilibjExamples/src/main/java/edu/wpi/first/wpilibj/templates/educational/Robot.java

@@ -0,0 +1,23 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+package edu.wpi.first.wpilibj.templates.educational;
+
+/**
+ * The VM is configured to automatically run this class, and to call the run() function when the
+ * robot is enabled. If you change the name of this class or the package after creating this
+ * project, you must also update the build.gradle file in the project.
+ */
+public class Robot extends EducationalRobot {
+  /**
+   * This function is run when the robot is first started up and should be used for any
+   * initialization code.
+   */
+  @Override
+  public void robotInit() {}
+
+  /** This function is run when the robot is enabled. */
+  @Override
+  public void run() {}
+}

wpilibjExamples/src/main/java/edu/wpi/first/wpilibj/templates/templates.json

@@ -75,5 +75,16 @@
     "gradlebase": "javaromi",
     "mainclass": "Main",
     "commandversion": 2
+  },
+  {
+    "name": "Educational Robot",
+    "description": "Educational Robot - Not for competition use",
+    "tags": [
+      "Educational"
+    ],
+    "foldername": "educational",
+    "gradlebase": "java",
+    "mainclass": "Main",
+    "commandversion": 2
   }
 ]