update README.md

Author: peiquan

README.md

@@ -50,9 +50,7 @@ stackoverflow-Java-top-qa
 - [Why is char[] preferred over String for passwords?](http://stackoverflow.com/questions/8881291/why-is-char-preferred-over-string-for-passwords)
 - [Generating random integers in a range with Java](http://stackoverflow.com/questions/363681/generating-random-integers-in-a-range-with-java)
 - [Why is printing “B” dramatically slower than printing “#”?](http://stackoverflow.com/questions/21947452/why-is-printing-b-dramatically-slower-than-printing)
-- [What is a serialVersionUID and why should I use it?](http://stackoverflow.com/questions/285793/what-is-a-serialversionuid-and-why-should-i-use-it)
 - [Is there a unique Android device ID?](http://stackoverflow.com/questions/2785485/is-there-a-unique-android-device-id)
-- [How to test a class that has private methods, fields or inner classes](http://stackoverflow.com/questions/34571/how-to-test-a-class-that-has-private-methods-fields-or-inner-classes)
 - [Why does this code using random strings print “hello world”?](http://stackoverflow.com/questions/15182496/why-does-this-code-using-random-strings-print-hello-world)
 - [How can I create an executable jar with dependencies using Maven?](http://stackoverflow.com/questions/574594/how-can-i-create-an-executable-jar-with-dependencies-using-maven)
 - [How to avoid Java code in JSP files?](http://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files)
@@ -79,7 +77,6 @@ stackoverflow-Java-top-qa
 - [What's the simplest way to print a Java array?](http://stackoverflow.com/questions/409784/whats-the-simplest-way-to-print-a-java-array)
 - [Why can't I switch on a String?](http://stackoverflow.com/questions/338206/why-cant-i-switch-on-a-string)
 - [How to create a Java String from the contents of a file?](http://stackoverflow.com/questions/326390/how-to-create-a-java-string-from-the-contents-of-a-file)
-- [Why does Java have transient variables?](http://stackoverflow.com/questions/910374/why-does-java-have-transient-variables)
 - [How can I convert a stack trace to a string?](http://stackoverflow.com/questions/1149703/how-can-i-convert-a-stack-trace-to-a-string)
 - [How do you assert that a certain exception is thrown in JUnit 4 tests?](http://stackoverflow.com/questions/156503/how-do-you-assert-that-a-certain-exception-is-thrown-in-junit-4-tests)
 - [What is a JavaBean exactly?](http://stackoverflow.com/questions/3295496/what-is-a-javabean-exactly)
@@ -119,7 +116,6 @@ stackoverflow-Java-top-qa
 - [What is the equivalent of the C++ Pair<L,R> in Java?](http://stackoverflow.com/questions/156275/what-is-the-equivalent-of-the-c-pairl-r-in-java)
 - [What is the difference between JSF, Servlet and JSP?](http://stackoverflow.com/questions/2095397/what-is-the-difference-between-jsf-servlet-and-jsp)
 - [How do I “decompile” Java class files?](http://stackoverflow.com/questions/272535/how-do-i-decompile-java-class-files)
-- [What is an efficient way to implement a singleton pattern in Java?](http://stackoverflow.com/questions/70689/what-is-an-efficient-way-to-implement-a-singleton-pattern-in-java)
 - [Useful Eclipse Java Code Templates [closed]](http://stackoverflow.com/questions/1028858/useful-eclipse-java-code-templates)
 - [Which @NotNull Java annotation should I use?](http://stackoverflow.com/questions/4963300/which-notnull-java-annotation-should-i-use)
 - [How to call SOAP web service in Android](http://stackoverflow.com/questions/297586/how-to-call-soap-web-service-in-android)