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This article mainly introduces the example analysis of arrays and common exceptions in Java, which is very detailed and has a certain reference value. Interested friends must read it!

Definition of array

1: a single variable can store information

2: used to store data collections with the same data type, you can use a common name to refer to the data stored in the array.

Characteristics

Arrays can store any type of data, including raw data types and reference data types, but once the type of array is specified, it can only be used to store data of the specified type.

The use of arrays

Declare an array variable to hold the array

Grammar

Data type [] array name

Data type array name []

/ / declare an array of int type named numebr int [] number;int number []; / / either of the above methods can

Create a new array object and assign it to the array variable you created in the previous step:

1: use the new operator

Int [] number = new [5]; / / it means that the length of the array number is set to 5, but once the length of the array is set, it cannot be changed.

2: initialize the array directly

Int [] number = {1, 2, 3, 4, 5, 6} / / you can also assign values directly and write values of the same type.

3: access or modify the data stored in this array

A: if you need to access elements in an array, you need to access it in the form of array name [subscript]

B: note that the maximum subscript of the array is: the length of the array is-1; the initial subscript is: 0

C: the length of an array can be obtained by using the length attribute of the array. Each array object has a length attribute to represent the length of the array, that is, the number of array elements.

/ / output number value the second digit System.out.println (number [1])

4: traverse the array:

To output all the elements in the array, you can use the for loop

Int [] numebr = {1, int 2, 3, 4, 5} for

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