What is buffer method in Java?

What are StringBuffer methods in Java?

Important methods of StringBuffer class

Modifier and Type Method
public synchronized StringBuffer append(String s)
public synchronized StringBuffer insert(int offset, String s)
public synchronized StringBuffer replace(int startIndex, int endIndex, String str)
public synchronized StringBuffer delete(int startIndex, int endIndex)

What is StringBuffer method?

A string buffer is like a String, but can be modified. It contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls. They are safe for use by multiple threads. Every string buffer has a capacity.

What is the use of StringBuffer in Java?

StringBuffer in java is used to create modifiable String objects. This means that we can use StringBuffer to append, reverse, replace, concatenate and manipulate Strings or sequence of characters. Corresponding methods under StringBuffer class are respectively created to adhere to these functions.

What is a buffer in Java Mcq?

This section of our 1000+ Java MCQs focuses on StringBuffer class of Java Programming Language. 1. … Explanation: StringBuffer represents growable and writable character sequence. 2. Which of this method of class StringBuffer is used to concatenate the string representation to the end of invoking string?

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What is the String method?

In Java, the length() string method returns the total number of characters – the length – of a String . String Methods. Introduction to String Methods. As you may recall, a String, which is widely used in Java, is an object that represents a sequence of characters.

What is String method in Java?

All String Methods

Method Description Return Type
toString() Returns the value of a String object String
toUpperCase() Converts a string to upper case letters String
trim() Removes whitespace from both ends of a string String
valueOf() Returns the string representation of the specified value String

What is the use of this keyword?

The this keyword refers to the current object in a method or constructor. The most common use of the this keyword is to eliminate the confusion between class attributes and parameters with the same name (because a class attribute is shadowed by a method or constructor parameter).

What is the size of StringBuffer?

Constructs a string buffer that contains the same characters as the specified CharSequence . The initial capacity of the string buffer is 16 plus the length of the CharSequence argument.

What is use of final keyword in Java?

Java final keyword is a non-access specifier that is used to restrict a class, variable, and method. If we initialize a variable with the final keyword, then we cannot modify its value. If we declare a method as final, then it cannot be overridden by any subclasses.

Why StringBuilder is used in Java?

The StringBuilder in Java represents a mutable sequence of characters. Since the String Class in Java creates an immutable sequence of characters, the StringBuilder class provides an alternative to String Class, as it creates a mutable sequence of characters.

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What is a Java array?

An array in Java is a set of variables referenced by using a single variable name combined with an index number. Each item of an array is an element. All the elements in an array must be of the same type. … An int array can contain int values, for example, and a String array can contain strings.

What is the return type of reverse () method?

StringBuffer. reverse() is an inbuilt method which is used to reverse the characters in the StringBuffer. The method causes this character sequence to be replaced by the reverse of the sequence. … Return Value : The method returns the StringBuffer after reversing the characters.

Why is StringBuffer mutable in Java?

Answer: The String class is considered as immutable, so that once it is created a String object cannot be changed. If there is a necessity to make alot of modifications to Strings of characters then StringBuffer should be used.

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