What is the benefit of ConcurrentHashMap<K,V>?

The "java" command line tool is used to:

JDBC addresses the issue of transactions.

Is it a good pratcice to catch "Throwable"?

The "static" keyword marks something as:

What are all the different types of access modifiers in Java

The keyword that ensures a field is coherently accessed by multiple threads is:

which statement is True ?

Given the code: Integer i= new Integer("1"); if (i.toString() == i.toString()) System.out.println("Equal"); else System.out.println("Not Equal");

Which one of the following statements is true about threads in Java

Which four options describe the correct default values for array elements of the types indicated? 1. int -> 0 2. String -> "null" 3. Dog -> null 4. char -> '\u0000' 5. float -> 0.0f 6. boolean -> true