There are basically two types of arrays in Java, i.e. Array elements are accessed by the numeric indexes, with the first element stored at 0 indexes. Array size needs to be defined at the time of array creation, and it remains constant. In Java, an array variable is declared similar to the other variables with sign after the data type of it. In this way, there would be no need to specify the variable name to each student name, and whenever we want to update, insert and retrieve the values, indices of this array can be used. The programmer can create an array of Student_names and specify its size at the time of the array object creation. So to handle these types of situations, Arrays are used. As the name of Student is of String data type, but it would be incorrect to store the name of each student in a different variable as it would not only occupy a lot of space but also creates confusion in a program too by increasing almost the same lines of code. Consider a situation in which we want to store the names of all the students of a class.
By similar type, we mean the values of the same datatype. Before understanding 3D arrays in Java, we should know what the array is and why is it used in programming languages? Arrays are basically a group of similar type of values which is referred by the same name.
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