Introduction and use of java Array
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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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