append - One string can be appended to another using the + operator. This will create a new string with all the characters in the first string followed by all the characters in the second string., child class - A class in Java can inherit object fields and methods from a parent class. The String class is a child class of the Object class., concatenate - One string can be concatenated after another which is the same as appending one string after another., immutable - Means that something doesn’t change. Strings are immutable. Any method that seems to change a string actually creates a new string., index - A number that represents the position of a character in a string. The first character in a string is at index 0., length - The number of characters in a string., override - A child class can provide the same method as one it inherits from a parent class and in that case the child method will execute instead of the parent method. The child method overrides the parent method., parent class - A class in Java has a parent class and it inherits object fields and public methods from the parent class. The Object class is the parent class of the String class., reference - is a way to find an object in memory. A reference is similar to a package tracking number since it helps you find the package., string - is an object of the String class which holds sequences of characters. The String class also defines methods that you can execute on a string object like getting its length or getting a substring (copy of part of the string). Notice that the String class starts with an uppercase letter. All class names in Java start with an uppercase letter., substring - A new string that contains a copy of part of the original string.,

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