Java String Fundamentals Quiz

A sequence of characters used in Java programming. It's an object in Java, meaning it has methods to manipulate it.

Each character in a string has a numerical position starting from 0. For example, "Hello World!" has a length of 12 characters.

You can create a string by directly assigning a literal value to a string object. Example: String greeting = "Hello World!";

A string enclosed in double quotes represents a series of characters that stay constant. Example: "Hello World!"

You can create a string using the new keyword and the String constructor. Example: String strGreet = new String("Hello World!");

A block of code that initializes a newly created object. It's used to give an initial value to a new string object.

The most common String constructor. It creates a new String object and stores the given value in it. Example: String s = new String("Hello World!");

A special String constructor that creates an empty String object. Example: String s = new String();

A method in Java that converts all characters in a string to lowercase.

A method in Java that returns the number of characters present in a string.

A method that combines (concatenates) two strings into a new, single string.

A method in Java that finds the index (position) of the first occurrence of a specific character or substring within a string.

In Java, the indexOf() method can optionally take a second argument, fromIndex, which tells the method where to start searching in the string.

A method in Java that converts all characters in a string to uppercase.

Used to indicate a specific character in the indexOf() method.

Represents the index from which to start the search for a character using the indexOf() method in Java.

A data type in Java that represents a sequence of characters. In Java, they are objects, so they can have methods to manipulate their content.

A method used to create a new String object containing an array of characters. Think of it as converting characters into a string.

A method used to create a new String object containing characters from a specified part of a character array. It allows you to extract only a portion of an array.

A special type of variable in Java that holds the address of a block of memory. Objects in Java are stored in the heap area.

A special feature in Java that allows you to group related classes together. They help organize code.

The process of storing and retrieving data from computer memory, specifically using addresses within the heap area.

A method that returns the character at a specific position within a String. The index starts from 0 for the first character.

A method that removes leading and trailing whitespace characters from a String.

A method that replaces all occurrences of a specific character or text with a new character or text within a String.

A method that compares two Strings to check if they are identical. It returns true if they are the same, and false if they are different.

A character sequence within a String that is being searched for or manipulated.

A special type of character used to mark the end of a String in Java. It is represented by a backslash followed by a zero ("\0").

Immutability refers to the concept that the content of a String object cannot be directly modified. New String objects are created when changes are made.

A method that searches for a specific character or substring within a string and returns its first occurrence's index. This method can optionally take a starting index from where to begin the search.

This method is used to compare two strings based on their Unicode values. The comparison is similar to the alphabetical order in a dictionary.

The 'fromIndex', can be used to specify where the search should start. It allows you to find the index of a substring within a string starting from a specific position.

The index of a character in a string is its position within the string, starting from zero. For example, in "Hello World!", the index of 'H' is 0 and the index of 'W' is 6.