Web-android Engineer first-6-3 how to use arrays in Java

Source: http://www.imooc.com/code/1525

Working with arrays in Java requires only four steps:

1. Declaring arrays

Syntax: OR

Where the array name can be any valid variable name, such as:

2. Allocate space

In short, it is the maximum number of elements that can be stored in the specified array

Grammar:

Where the array length is the number of elements that can be stored in an array, such as:

In other words, we can also combine the above two steps to allocate space for it while declaring an array, such as:

3. Assign Value

After allocating space, the data can be placed into the array, and the elements in the array are accessed by subscripts, such as storing student scores in the scores array

4. Working with data in arrays

We can manipulate and manipulate the array after the assignment, such as getting and outputting the values of the elements in the array

Another way to create an array directly in Java is to combine declaring an array, allocating space, and assigning values, such as

It is equivalent to:

Task

Small partners, the use of the array of steps you have mastered it, let us test it.

An array subjects is defined in the editor to hold the exam account information, please complete the code in section 5, and output the fourth account information in the array.

Operation Result:

1  Public classHelloWorld {2      Public Static voidMain (string[] args) {3         4         //defines a string array of length 5, saving test account information5String[] Subjects =                    ;6         7         //assign a value to an element in the array, respectively8Subjects[0] = "Oracle";9SUBJECTS[1] = "PHP";TenSUBJECTS[2] = "Linux"; OneSUBJECTS[3] = "Java"; ASUBJECTS[4] = "HTML"; -          -System.out.println ("The first 4 accounts in the array are:" +           ); the     } -}

1  Public classHelloWorld {2      Public Static voidMain (string[] args) {3         4         //defines a string array of length 5, saving test account information5String[] Subjects =NewString[5];6         7         //assign a value to an element in the array, respectively8Subjects[0] = "Oracle";9SUBJECTS[1] = "PHP";TenSUBJECTS[2] = "Linux"; OneSUBJECTS[3] = "Java"; ASUBJECTS[4] = "HTML"; -          -System.out.println ("The first 4 accounts in the array are:" + subjects[3]); the     } -}

Web-android Engineer first-6-3 how to use arrays in Java