Java Core Classes and Threads

This is the correct answer. There is no Subclass named charWriter. The correct name is CharArrayWriter which is used for writing to a char array. So this is the correct answer.

As I explained both the classes in option 2 & 3 are the only subclasses of InputStream class. So this is the correct answer.

As I explained that all of the given methods are defined in the File class. So this is the correct answer.

As I explained the reason all of the functions are defined in the String class. So this is the correct answer.

This is the correct answer. Because there is no method defined in the String class named toLower(). So it cannot be invoked using the object of String class.The correct method is toLowerCase() which converts the characters to lowercase. So this is the correct answer.

For overridden methods, return type and signature should be the same.

System.gc() is the garbage collection method, even though it won't guarantee.

Length is an attribute of Array.

.toLowerCase() converts a string to lowercase.

A thread goes to dead state once its run method completes.

Deadlock is the situation in which all processes wait for one another and no one gets an exclusive lock.

ArrayIndexOutOfBoundsException is thrown while trying to access an object at invalid index number.

This block deals with the processing of rest of statements irrespective of whether an exception is raised or not.

This function searches for the last occurrence of a character or a substring.

The getChars() function is used in Java to extract more than one character at a time.