unit test & comments

core/src/main/java/com/taobao/arthas/core/util/matcher/FalseMatcher.java

@@ -5,6 +5,11 @@ package com.taobao.arthas.core.util.matcher;
  */
 public class FalseMatcher<T> implements Matcher<T> {
 
+    /**
+     * always return false
+     * @param target
+     * @return true/false
+     */
     @Override
     public boolean matching(T target) {
         return false;

core/src/main/java/com/taobao/arthas/core/util/matcher/RegexMatcher.java

@@ -1,7 +1,7 @@
 package com.taobao.arthas.core.util.matcher;
 
 /**
- * 正则表达式匹配
+ * regex matcher
  * @author ralf0131 2017-01-06 13:16.
  */
 public class RegexMatcher implements Matcher<String> {

core/src/main/java/com/taobao/arthas/core/util/matcher/TrueMatcher.java

@@ -5,6 +5,11 @@ package com.taobao.arthas.core.util.matcher;
  */
 public final class TrueMatcher<T> implements Matcher<T> {
 
+    /**
+     * always return true
+     * @param target
+     * @return
+     */
     @Override
     public boolean matching(T target) {
         return true;

core/src/main/java/com/taobao/arthas/core/util/matcher/WildcardMatcher.java

@@ -1,7 +1,7 @@
 package com.taobao.arthas.core.util.matcher;
 
 /**
- * 通配符表达式匹配
+ * wildcard matcher
  * @author ralf0131 2017-01-06 13:17.
  */
 public class WildcardMatcher implements Matcher<String> {