Improve code's readability by applying modifiers standard order

Author: JeanDeboutGat

webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java

@@ -86,11 +86,11 @@ public class Spider implements Runnable, Task {
 
     protected boolean exitWhenComplete = true;
 
-    protected final static int STAT_INIT = 0;
+    protected static final int STAT_INIT = 0;
 
-    protected final static int STAT_RUNNING = 1;
+    protected static final int STAT_RUNNING = 1;
 
-    protected final static int STAT_STOPPED = 2;
+    protected static final int STAT_STOPPED = 2;
 
     protected boolean spawnUrl = true;
 

webmagic-core/src/main/java/us/codecraft/webmagic/model/HttpRequestBody.java

@@ -20,7 +20,7 @@ public class HttpRequestBody implements Serializable {
 
     private static final String ENCODING_ERROR ="illegal encoding "; 
 
-    public static abstract class ContentType {
+    public abstract static class ContentType {
 
         public static final String JSON = "application/json";
 

webmagic-core/src/main/java/us/codecraft/webmagic/utils/HttpConstant.java

@@ -7,7 +7,7 @@
  */
 public abstract class HttpConstant {
 
-    public static abstract class Method {
+    public abstract static class Method {
 
         public static final String GET = "GET";
 
@@ -25,13 +25,13 @@ public static abstract class Method {
 
     }
 
-    public static abstract class StatusCode {
+    public abstract static class StatusCode {
 
         public static final int CODE_200 = 200;
 
     }
 
-    public static abstract class Header {
+    public abstract static class Header {
 
         public static final String REFERER = "Referer";