do NOT create wrapper type instance when can (#1985)

client/src/main/java/com/taobao/arthas/client/TelnetConsole.java

@@ -285,7 +285,7 @@ public class TelnetConsole {
             }
 
             // ctrl + c event callback
-            consoleReader.getKeys().bind(new Character((char) CTRL_C).toString(), new ActionListener() {
+            consoleReader.getKeys().bind(Character.toString((char) CTRL_C), new ActionListener() {
                 @Override
                 public void actionPerformed(ActionEvent e) {
                     try {
@@ -300,7 +300,7 @@ public class TelnetConsole {
             });
 
             // ctrl + d event call back
-            consoleReader.getKeys().bind(new Character(KeyMap.CTRL_D).toString(), eotEventCallback);
+            consoleReader.getKeys().bind(Character.toString(KeyMap.CTRL_D), eotEventCallback);
 
             try {
                 telnet.connect(telnetConsole.getTargetIp(), telnetConsole.getPort());

core/src/main/java/com/taobao/arthas/core/shell/command/internal/WordCountHandler.java

@@ -25,7 +25,7 @@ public class WordCountHandler extends StdoutHandler implements StatisticsFunctio
         CommandLine commandLine = CLIs.create(NAME)
                 .addOption(new Option().setShortName("l").setFlag(true))
                 .parse(args);
-        Boolean lineMode = commandLine.isFlagEnabled("l");
+        boolean lineMode = commandLine.isFlagEnabled("l");
         return new WordCountHandler(lineMode);
     }