diff --git a/src/main/java/com/alibaba/druid/pool/DruidDataSourceC3P0Adapter.java b/src/main/java/com/alibaba/druid/pool/DruidDataSourceC3P0Adapter.java
index dba9e942e3..18b79451dd 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidDataSourceC3P0Adapter.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidDataSourceC3P0Adapter.java
@@ -36,21 +36,15 @@ public class DruidDataSourceC3P0Adapter implements DataSource, DruidDataSourceC3
         dataSource = new DruidDataSource();
 
         // setDefault
-        this.setInitialPoolSize(3);
-        this.setAcquireIncrement(3);
-        this.setAcquireIncrement(30);
-        this.setAcquireRetryDelay(1000);
-        this.setAutoCommitOnClose(true);
-        this.setAutomaticTestTable(null);
-        this.setCheckoutTimeout(0);
-        this.setDebugUnreturnedConnectionStackTraces(false);
-        this.setMaxIdleTime(0);
-        this.setMaxPoolSize(15);
-        this.setMaxStatements(0);
-        this.setMaxStatementsPerConnection(0);
-        this.setMinPoolSize(3);
-        this.setTestConnectionOnCheckin(false);
-        this.setTestConnectionOnCheckout(false);
+        dataSource.setInitialSize(3);
+        acquireIncrement = 3;
+        dataSource.setTimeBetweenConnectErrorMillis(1000);
+        dataSource.setDefaultAutoCommit(true);
+        dataSource.setLogAbandoned(false);
+        dataSource.setMaxActive(15);
+        dataSource.setMinIdle(3);
+        dataSource.setTestOnReturn(false);
+        dataSource.setTestOnBorrow(false);
     }
 
     @Override
diff --git a/src/main/java/com/alibaba/druid/support/http/stat/WebAppStat.java b/src/main/java/com/alibaba/druid/support/http/stat/WebAppStat.java
index dd3e43d2cc..712784ca3f 100644
--- a/src/main/java/com/alibaba/druid/support/http/stat/WebAppStat.java
+++ b/src/main/java/com/alibaba/druid/support/http/stat/WebAppStat.java
@@ -864,9 +864,6 @@ public class WebAppStat {
             osWindows2000Count.incrementAndGet();
         } else if (userAgent.startsWith("Windows NT 5.0", 25)) {
             osWindows2000Count.incrementAndGet();
-
-        } else {
-            System.out.print("");
         }
     }
 
@@ -889,8 +886,6 @@ public class WebAppStat {
             osWindowsXPCount.incrementAndGet();
         } else if (userAgent.startsWith("Windows XP", 34)) {
             osWindowsXPCount.incrementAndGet();
-        } else {
-            System.out.print("");
         }
     }
 
diff --git a/src/main/java/com/alibaba/druid/support/http/util/IPAddress.java b/src/main/java/com/alibaba/druid/support/http/util/IPAddress.java
index a6e2917c8d..72791ccc01 100644
--- a/src/main/java/com/alibaba/druid/support/http/util/IPAddress.java
+++ b/src/main/java/com/alibaba/druid/support/http/util/IPAddress.java
@@ -118,7 +118,7 @@ public class IPAddress implements Cloneable {
      * @exception InvalidIPAddressException Throws this exception when the specified string doesn't represent a valid IP
      * address.
      */
-    public IPAddress(String ipAddressStr) {
+    public IPAddress(String ipAddressStr){
         ipAddress = parseIPAddress(ipAddressStr);
     }
 
@@ -212,7 +212,7 @@ public class IPAddress implements Cloneable {
      * @exception InvalidIPAddressException Throws this exception if the specified IP address is not compliant to the
      * decimal-dotted notation xxx.xxx.xxx.xxx.
      */
-    protected int parseIPAddress(String ipAddressStr) {
+    final int parseIPAddress(String ipAddressStr) {
         int result = 0;
 
         if (ipAddressStr == null) {
@@ -269,35 +269,15 @@ public class IPAddress implements Cloneable {
 
         return result;
     }
-    
-    public int hashCode () {
+
+    public int hashCode() {
         return this.ipAddress;
     }
 
-  
     public boolean equals(Object another) {
         if (another instanceof IPAddress) {
             return ipAddress == ((IPAddress) another).ipAddress;
         }
         return false;
     }
-
-
-    public Object clone() {
-        return new IPAddress(ipAddress);
-    }
-
-    public static void main(String[] args) {
-
-        System.out.println(Integer.toBinaryString(255));
-
-        // try {//"192.168.1.1"
-        // IPAddress ip = new IPAddress(Integer.toBinaryString(3));
-        // System.out.println(ip.getIPAddress());
-        // System.out.println(ip.toString());
-        // System.out.println(ip.parseIPAddress("192.168.4.4"));
-        // } catch (InvalidIPAddressException e) {
-        // e.printStackTrace();
-        // }
-    }
 }
diff --git a/src/main/java/com/alibaba/druid/support/http/util/IPRange.java b/src/main/java/com/alibaba/druid/support/http/util/IPRange.java
index f7cd78f7f5..b2e21a0c90 100644
--- a/src/main/java/com/alibaba/druid/support/http/util/IPRange.java
+++ b/src/main/java/com/alibaba/druid/support/http/util/IPRange.java
@@ -193,7 +193,7 @@ public class IPRange {
      * @param range String representation of the IP range.
      * @exception InvalidIPRangeException Throws this exception if the specified range is not a valid IP network range.
      */
-    protected void parseRange(String range) {
+    final void parseRange(String range) {
         if (range == null) {
             throw new IllegalArgumentException("Invalid IP range");
         }
diff --git a/src/main/java/com/alibaba/druid/support/json/JSONParser.java b/src/main/java/com/alibaba/druid/support/json/JSONParser.java
index d8456370e5..9098b41994 100644
--- a/src/main/java/com/alibaba/druid/support/json/JSONParser.java
+++ b/src/main/java/com/alibaba/druid/support/json/JSONParser.java
@@ -153,7 +153,7 @@ public class JSONParser {
         throw new IllegalArgumentException("illegal token : " + token + ", expect " + token);
     }
 
-    void nextToken() {
+    final void nextToken() {
         if (index == Integer.MIN_VALUE) {
             token = Token.EOF;
             return;
diff --git a/src/main/java/com/alibaba/druid/util/ConcurrentIdentityHashMap.java b/src/main/java/com/alibaba/druid/util/ConcurrentIdentityHashMap.java
index 13e2c0594c..b1d03c5305 100644
--- a/src/main/java/com/alibaba/druid/util/ConcurrentIdentityHashMap.java
+++ b/src/main/java/com/alibaba/druid/util/ConcurrentIdentityHashMap.java
@@ -39,7 +39,7 @@ import java.util.concurrent.locks.ReentrantLock;
  * @param <K> the type of keys maintained by this map
  * @param <V> the type of mapped values
  */
-public class ConcurrentIdentityHashMap<K, V> extends AbstractMap<K, V> implements ConcurrentMap<K, V> {
+public final class ConcurrentIdentityHashMap<K, V> extends AbstractMap<K, V> implements ConcurrentMap<K, V> {
 
     /**
      * The default initial capacity for this table, used when not otherwise specified in a constructor.
diff --git a/src/main/java/com/alibaba/druid/wall/WallConfig.java b/src/main/java/com/alibaba/druid/wall/WallConfig.java
index 6810ccdf7f..231c2481b9 100644
--- a/src/main/java/com/alibaba/druid/wall/WallConfig.java
+++ b/src/main/java/com/alibaba/druid/wall/WallConfig.java
@@ -90,7 +90,7 @@ public class WallConfig implements WallConfigMBean {
         this.dir = dir;
     }
 
-    public void init() {
+    public final void init() {
         loadConfig(dir);
     }