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The correct option is (a) True

Easy EXPLANATION - The STRING class objects can be used for any string consisting of characters. The characters include NUMBERS, ALPHABETS and few special characters. String class is not necessary to be used but provides a HUGE set of inbuilt functions to make the string operations easier.

Right option is (a) Second ARGUMENT INDICATES the occurrence number of SPECIFIED character from starting

Explanation: The STRING may have more than one occurrence of a character. We use this function to get the index at which the specified number of times a specific character has OCCURRED in a string. For example, we can get the index of 5th occurrence of character “j” in a string.

The correct option is (b) 2

The explanation is: The first argument is the target CHARACTER. This target character will be REPLACED by another character. The NEW character is the SECOND argument to the function. Only the characters can be passed as argument, not a string.

The CORRECT OPTION is (d) Remove white space from both the ends of STRING

For explanation: The FUNCTION is used to remove any white space from both the ends of a given string. The white space include space, tab, next line etc. It will be removed both from the starting of string and from the end of string.

Correct option is (c) Convert the WHOLE string CHARACTERS to uppercase

To explain: The function is used to convert each character of the string. If the character is already uppercase then it REMAINS the same. But if some character is in lowercase then it will be converted to uppercase.

Right CHOICE is (c) COMPARE string OBJECT to another string object

For explanation: The source and target must be objects of the string class. The compare is always CASE sensitive. To compare two string objects without case sensitivity then we can use compareToIgnoreCase() function.

Right answer is (b) CASE sensitive, Case insensitive

The best I can EXPLAIN: Both the functions RETURN Boolean VALUE. The function equal() is case sensitive and returns false even if a single character is case DIFFERENT in two strings. The other function ignores the case sensitivity and only checks if the spellings are same.

Right choice is (a) Get the INDEX of last OCCURRENCE of specified character in argument

For EXPLANATION: The function is used to get the last occurrence index of a character present in a string. The return TYPE is char. Single character is returned. The function is used with a string object and the target character is passed as its argument.

The CORRECT OPTION is (d) String starting from first index and ENDING at second index position

Easy explanation - A value of string type is returned from this function. The returned string is a substring that starts from the first ARGUMENT position, till the second index position. The indices must be less than the LENGTH of actual string.

The CORRECT option is (C) It returns the string from specified index till the END

To explain I would say: The substring FUNCTION returns a string value. The string is the substring starting from the specified index till the end. The substring function have to be called with the OBJECT of string class.

The CORRECT ANSWER is (b) Returns length of string excluding null character

Best explanation: The length function returns the length of string. The length is the number of characters in the string but the last null character is not COUNTED. The string length can be USED to loop through each character in the string.

The CORRECT ANSWER is (a) String object_Name = value;

The best I can explain: The class name String is given. And then the object name is mentioned. There are two ways to declare and INITIALIZE the string. Either by giving direct string value or by using new keyword. But if new operator is used, CONSTRUCTOR of String class have to be called. From the given options, the direct string value declaration is correct.

The correct option is (a) Object are IMMUTABLE

The explanation is: The object of string class are mostly immutable. This means that the String objects are CONSTANT. These can’t be CHANGED once created.

Right choice is (b) OBJECTSTREAMCLASS

To explain: The ObjectStreamClass object can be created to handle serializations. The class is provided specially for the serializations. It is descriptor LIKE we have a file descriptor to handle/access FILES.

Right option is (c) Read and write to a random access file

To explain I WOULD SAY: The RandomAccessFile class INSTANCE can be created to HANDLE input and output operations to a random access file. It first checks the permissions on the file and then any required operation can be DONE on a random access file. Comparatively faster than other files access.

Right CHOICE is (a) True

Easy explanation - The PushBackReader allows the character streams handling. The MAIN feature is that the STREAM can be PUSHED back to the stream. This is USED in special cases of handling input stream.

Correct ANSWER is (B) UnsupportedEncodingException

The explanation is: The encoding that is UNSUPPORTED in a system can be handled. The EXCEPTION handler is UnSupportedEncodingException class. An object of this class can be created which will catch the exception and handle it.

Right ANSWER is (d) A character stream whose source is STRING only

Explanation: The StringReader can only WORK with the string type data. Even if a character array is given, it MIGHT produce some errors in code. Hence only the string values can be handled properly.

Right choice is (C) InteruptedIOException

Explanation: The only class which handles the IO class INTERRUPTS is InteruptedIOException class. This class is SPECIALLY provided to HANDLE any case that INVOLVES the execution interrupt.

Correct option is (b) ABSTRACT CLASS to read character streams

For explanation: The Reader class is an abstract class that can be used to read characters STREAM. It can’t be used for any kind of input. It can just read the EXISTING data.

Right OPTION is (a) LineNumberInputStream

Easy EXPLANATION - The LineNumberInputStream class makes false assumptions. The false assumption is that it assumes, all the byte data is a CHARACTER. Which is actually not the case, INSTEAD the character have one byte MEMORY space.

Right answer is (d) This class is used to REPRESENT file access permissions

For explanation: The FilePermission can’t GET access to the device access permissions. The PERMISSION is given to a file when it is CREATED or otherwise when a privileged user changes it. Then these permission rights can be accessed USING the FilePermission class.

The correct answer is (d) Gets the input STREAM from any open file only

Explanation: The most specific answer is that the FileInputStream can only be used for the opened files. The class can work only for the file TYPE. No SOCKET or another source are allowed to be accessed.

The correct ANSWER is (a) A HANDLE for machine specific structure of an open FILE

Easiest explanation - The machine specific structure of an open file have to be handled in some special ways. FileDescriptor class can handle those FILES. The FileDescriptor can also handle open socket, another SOURCE, sink of bytes.

Correct answer is (C) An abstract which can be used to represent path names or file

Easy EXPLANATION - The File class is made to operate with the files. The file can be of any type. All the input and OUTPUT operations that have to be performed on a file can be DONE using File class object.

The correct OPTION is (a) Console

To explain I would say: The Console class contains the METHODS to access the character BASED devices. The devices which can stream the data as character set. All those devices can be made use of by USING the methods of class Console.

Correct option is (d) DATA streams, SERIALIZATION and file system

To explain I would say: The IO classes are MADE such that those can support the input and output from any TYPE of source or destination. The input can be taken from system file and standard input and also some special devices if conned. Same is CASE to show the output.

Right OPTION is (C) java.util

Easiest explanation - The package java.util contains all the utility classes. This package also contains GENERIC data structures, date, time etc. These can be USED in any java program, you just have to include java.util package.

The correct answer is (d) PUT

For explanation: Put is not a SYSTEM CLASS variable. The most GENERAL and BASIC variables are err, out and in. The variables can handle most of the tasks performed in a program.

Correct answer is (b) System

The explanation: The RUNFINALIZATION() Function is defined in the System class. The function is used to FINALIZE an object which undergo DESTRUCTION. The action is required to TERMINATE the object properly.

The correct answer is (a) exit(INT);

To explain: The exit function should be used to terminate the program. The function is PASSED with an ARGUMENT. The argument INDICATED the type of error occurred.

Correct ANSWER is (c) Array_name.length

Easy explanation - The array name is given of which the length have to be calculated. The array length is stored in the attribute length. Hence we ACCESS it using dot OPERATOR.

Right option is (c) Each CLASS has an associated ARRAY class

The best I can EXPLAIN: The Array class is associated with all the other classes. This GIVES us the flexibility to declare an array of any type. The INDEX goes from 0 to n, where n is some fixed size for array.

The correct CHOICE is (c) FUNCTION definitions

The best explanation: The classes contain the definitions of the SPECIAL functions that are PROVIDED for the programmers use. Those functions can be used to make the programming easy and to reuse the already existing code.

The correct OPTION is (a) MUST be included before use

The best EXPLANATION: The inbuilt classes must be included in the program. WHENEVER some functions are used, they must have a declaration before use. The same is the case with classes.

Correct choice is (a) The predefined classes in a LANGUAGE

To explain I would say: The classes that are already provided in a PROGRAMMING language for USE are inbuilt classes. These classes provide some functions or objects that can be used by the programmer for EASIER code.