scala中打印数组和集合_如何在Scala中打印数组？

╰+哭是因爲堅強的太久メ 2023-03-05 09:57 11阅读 0赞

scala中打印数组和集合

## Scala中的数组 **(**Array in Scala**)** ##

In Scala, Array is a data structure that is a collection of elements of same data type.

在Scala中，数组是一种数据结构，是相同数据类型的元素的集合。

**Creating an array:**

**创建一个数组：**

The Array keyword is used to create an array in Scala. There are multiple syntaxes to create an array. They are,

Array关键字用于在Scala中创建数组。 创建数组有多种语法。 他们是，

var array_name : Array[data_type] = new Array[data_type(size) 
        var array_name: Array[data_tpye] = new Array(size)
        var array_name = new Array[data_type](size) 
        var array_name = Array(element1, elmenet2, element3, ...)

All the four declarations are valid but the last two are commonly used.

这四个声明都是有效的，但最后两个是常用的。

**Accessing an element from the array:**

**从数组访问元素：**

To access the element of the array, its index is used.

要访问数组的元素，请使用其索引。

**Syntax:**

**句法：**

array_name[index]

## 打印阵列 **(**Print Array**)** ##

There are two methods to print all the elements of the array (print array):

有两种方法可以打印数组的所有元素(打印数组)：

1.  Using iteration
    
    使用迭代
2.  Using string conversion
    
    使用字符串转换

### 1)使用迭代打印数组元素 **(**1) Printing elements of array using iteration**)** ###

We can print the elements of the array by integrating over all the elements of the array and then printing each element using their index.

我们可以通过对数组的所有元素进行积分，然后使用它们的索引来打印每个元素，来打印数组的元素。

**Syntax:**

**句法：**

for(i 
     Program to print array using iteration 
     Output: 
     Elements of Array are : 
    97 90 89 75 45 78 99
     
     Explanation: 
     In the above code, we have created an array of integer values and then use the for loop to iterate over the elements of the array using the print statement. 
     2) Printing elements of the array using string conversion method 
     We can print array using the string conversion method, i.e. converting the array to a string using mkString() method. 
     Syntax: 
     Program to print array using string conversion method 
     object MyClass {
         
        def main(args: Array[String]) {
         
            var score = Array("C", "C++", "Java", "Python", "Scala")   
            var string = score.mkString(" , ")
            println("Elements of Array are :\n" + string)
        }
    }
     
     Output: 
     Explanation: 
     In the above code, we have declared an array of strings. We have used the mkString() method to convert the array of string to string and then print it using the print statement. 
    
    
    
    
    
    
       
        
    
        
         
    
         
          
    
          
           
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for(i 
      Program to print array using iteration 
      Output: 
     Elements of Array are : 
    97 90 89 75 45 78 99
     
      Explanation: 
     In the above code, we have created an array of integer values and then use the for loop to iterate over the elements of the array using the print statement. 
     2) Printing elements of the array using string conversion method 
     We can print array using the string conversion method, i.e. converting the array to a string using mkString() method . 
      Syntax: 
      Program to print array using string conversion method 
      object MyClass {
        def main ( args : Array [ String ]) {
            var score = Array ( "C" , "C++" , "Java" , "Python" , "Scala" )   
            var string = score . mkString ( " , " )
            println ( "Elements of Array are :\n" + string )
        }
    }
     
      Output: 
      Explanation: 
     In the above code, we have declared an array of strings. We have used the mkString() method to convert the array of string to string and then print it using the print statement. 
    
    
    
    
    
    
       
        
    
        
         
    
         
          
    
          
           
    TOP Interview Coding Problems/Challenges
     
    
          
           
            Run-length encoding (find/print frequency of letters in a string) 
            Sort an array of 0's, 1's and 2's in linear time complexity 
            Checking Anagrams (check whether two string is anagrams or not) 
            Relative sorting algorithm 
            Finding subarray with given sum 
            Find the level in a binary tree with given sum K 
            Check whether a Binary Tree is BST (Binary Search Tree) or not 
            1[0]1 Pattern Count 
            Capitalize first and last letter of each word in a line 
            Print vertical sum of a binary tree 
            Print Boundary Sum of a Binary Tree 
            Reverse a single linked list 
            Greedy Strategy to solve major algorithm problems 
            Job sequencing problem 
            Root to leaf Path Sum 
            Exit Point in a Matrix 
            Find length of loop in a linked list 
            Toppers of Class 
            Print All Nodes that don't have Sibling 
            Transform to Sum Tree 
            Shortest Source to Destination Path 
           
    
         
          
    
         
          
    
    
         
          
    
          
           
    
         
          
    
         
          
          
           
         
          
    
         
          
    
         
          
    
          
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> 翻译自: [https://www.includehelp.com/scala/how-to-print-an-array.aspx][https_www.includehelp.com_scala_how-to-print-an-array.aspx]

scala中打印数组和集合

[https_www.includehelp.com_scala_how-to-print-an-array.aspx]: https://www.includehelp.com/scala/how-to-print-an-array.aspx