diff --git a/代码/workspace_robo4/robocode.api/src/main/java/robocode/JuniorRobot.java b/代码/workspace_robo4/robocode.api/src/main/java/robocode/JuniorRobot.java
index 8531c7b..23675ca 100644
--- a/代码/workspace_robo4/robocode.api/src/main/java/robocode/JuniorRobot.java
+++ b/代码/workspace_robo4/robocode.api/src/main/java/robocode/JuniorRobot.java
@@ -103,38 +103,38 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 *
 	 * @see #fieldWidth
 	 */
-	public int fieldWidth;
+	public static final int fieldWidth;
 
 	/**
 	 * Contains the height of the battlefield.
 	 *
 	 * @see #fieldWidth
 	 */
-	public int fieldHeight;
+	public static final int fieldHeight;
 
 	/**
 	 * Current number of other robots on the battle field.
 	 */
-	public int others;
+	public static final int others;
 
 	/**
 	 * Current energy of this robot, where 100 means full energy and 0 means no energy (dead).
 	 */
-	public int energy;
+	public static final int energy;
 
 	/**
 	 * Current horizontal location of this robot (in pixels).
 	 *
 	 * @see #robotY
 	 */
-	public int robotX;
+	public static final int robotX;
 
 	/**
 	 * Current vertical location of this robot (in pixels).
 	 *
 	 * @see #robotX
 	 */
-	public int robotY;
+	public static final int robotY;
 
 	/**
 	 * Current heading angle of this robot (in degrees).
@@ -147,7 +147,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #turnBackLeft(int, int)
 	 * @see #turnBackRight(int, int)
 	 */
-	public int heading;
+	public static final int heading;
 
 	/**
 	 * Current gun heading angle of this robot (in degrees).
@@ -158,7 +158,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #turnGunTo(int)
 	 * @see #bearGunTo(int)
 	 */
-	public int gunHeading;
+	public static final int gunHeading;
 
 	/**
 	 * Current gun heading angle of this robot compared to its body (in degrees).
@@ -169,7 +169,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #turnGunTo(int)
 	 * @see #bearGunTo(int)
 	 */
-	public int gunBearing;
+	public static final int gunBearing;
 
 	/**
 	 * Flag specifying if the gun is ready to fire, i.e. gun heat <= 0.
@@ -179,7 +179,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #fire()
 	 * @see #fire(double)
 	 */
-	public boolean gunReady;
+	public static final boolean gunReady;
 
 	/**
 	 * Current distance to the scanned nearest other robot (in pixels).
@@ -193,7 +193,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #scannedVelocity
 	 * @see #scannedHeading
 	 */
-	public int scannedDistance = -1;
+	public static final int scannedDistance = -1;
 
 	/**
 	 * Current angle to the scanned nearest other robot (in degrees).
@@ -207,7 +207,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #scannedVelocity
 	 * @see #scannedHeading
 	 */
-	public int scannedAngle = -1;
+	public static final int scannedAngle = -1;
 
 	/**
 	 * Current angle to the scanned nearest other robot (in degrees) compared to
@@ -222,7 +222,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #scannedVelocity
 	 * @see #scannedHeading
 	 */
-	public int scannedBearing = -1;
+	public static final int scannedBearing = -1;
 
 	/**
 	 * Current velocity of the scanned nearest other robot.
@@ -239,7 +239,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #scannedEnergy
 	 * @see #scannedHeading
 	 */
-	public int scannedVelocity = -99;
+	public static final int scannedVelocity = -99;
 
 	/**
 	 * Current heading of the scanned nearest other robot (in degrees).
@@ -253,7 +253,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #scannedEnergy
 	 * @see #scannedVelocity
 	 */
-	public int scannedHeading = -1;
+	public static final int scannedHeading = -1;
 
 	/**
 	 * Current energy of scanned nearest other robot.
@@ -266,7 +266,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #scannedBearing
 	 * @see #scannedVelocity
 	 */
-	public int scannedEnergy = -1;
+	public static final int scannedEnergy = -1;
 
 	/**
 	 * Latest angle from where this robot was hit by a bullet (in degrees).
@@ -276,7 +276,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #onHitByBullet()
 	 * @see #hitByBulletBearing
 	 */
-	public int hitByBulletAngle = -1;
+	public static final int hitByBulletAngle = -1;
 
 	/**
 	 * Latest angle from where this robot was hit by a bullet (in degrees)
@@ -287,7 +287,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #onHitByBullet()
 	 * @see #hitByBulletAngle
 	 */
-	public int hitByBulletBearing = -1;
+	public static final int hitByBulletBearing = -1;
 
 	/**
 	 * Latest angle where this robot has hit another robot (in degrees).
@@ -297,7 +297,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #onHitRobot()
 	 * @see #hitRobotBearing
 	 */
-	public int hitRobotAngle = -1;
+	public static final int hitRobotAngle = -1;
 
 	/**
 	 * Latest angle where this robot has hit another robot (in degrees)
@@ -308,7 +308,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #onHitRobot()
 	 * @see #hitRobotAngle
 	 */
-	public int hitRobotBearing = -1;
+	public static final int hitRobotBearing = -1;
 
 	/**
 	 * Latest angle where this robot has hit a wall (in degrees).
@@ -318,7 +318,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #onHitWall()
 	 * @see #hitWallBearing
 	 */
-	public int hitWallAngle = -1;
+	public static final int hitWallAngle = -1;
 
 	/**
 	 * Latest angle where this robot has hit a wall (in degrees)
@@ -329,7 +329,7 @@ public class JuniorRobot extends _RobotBase implements IJuniorRobot {
 	 * @see #onHitWall()
 	 * @see #hitWallAngle
 	 */
-	public int hitWallBearing = -1;
+	public static final int hitWallBearing = -1;
 
 	/**
 	 * The robot event handler for this robot.