Is set thread safe java?
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how can you retrive information from database by using hashmap/arraylist ,plz explain with example briefly?
What do you mean by the term transient?
Why singleton is not thread safe?
Is void a wrapper class?
Can there be an abstract method without an abstract class?
Which java version is latest?
Have you used any version control ? if so explain about it?
when i write string s1="java"; in one program(application) and string s2="java"; in another application on the same jvm will both objects s2,s2 will refer to same memory location where "java" is stored in string pool.
What means public static?
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Can we sort list in java?
What is a flag value?
Core Java 
