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This article introduces the relevant knowledge of "introduction and use of java array". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Introduction

Arrays are one of the most important data structures for every programming language. It refers to a set of related types of variables, and these variables operate in a uniform way, using a fixed size of storage space to store data.

How the array is declared

DataType [] arrayRefVar; / / preferred method

Or

DataType arrayRefVar []; / / the effect is the same, but not the preferred method

How the array is created

ArrayRefVar = new dataType [arraySize]

Or

DataType [] arrayRefVar = {value0, value1,..., valuek}

Operation of array

The array type and size are determined, so when dealing with array elements, you can operate through the for loop or through the array subscript; (note: array subscript starts at 0)

Examples are as follows:

Public class TestArray {

Public static void main (String [] args) {

Double [] myList = {1.9,2.9,3.4,3.5}

/ / print all array elements

For (int I = 0; I

< myList.length; i++) { System.out.println(myList[i] + " "); } // 计算所有元素的总和 double total = 0; for (int i = 0; i < myList.length; i++) { total += myList[i]; } System.out.println("Total is " + total); // 查找最大元素 double max = myList[0]; for (int i = 1; i < myList.length; i++) { if (myList[i] >

Max) max = myList [I]

}

System.out.println ("Max is" + max)

}

}

Multidimensional array

A multidimensional array is equivalent to an array that is an array. For example, a two-dimensional array is a special one-dimensional array, and each element is an array, as shown below:

String str [] [] = new String [3] [4]

The syntax of the two-dimensional array is as follows:

Type [] [] typeName = new type [typeLength2] [typeLength3]

Note: multi-dimensional array is the same.

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