如何確定Java中數組的長度或大小？

In Java, one of the convenient ways to determine the length or size of an array is by using its length property. It counts the number of elements stored in an array and returns the count . Finding the length of an array is one of the common yet crucial operation as it is used to find the number of elements of an array, append new elements into it and retrieve stored items. This article ms toways length or size of an array.

Java Program to determine the length or size of an Array

以下範例將幫助我們了解如何找到陣列的大小。

Example 1

的中文翻譯為：

範例 1

The following example illustrates the use of length property with an array of type integer.

import java.util.*;
public class Example1 {
   public static void main(String[] args) {
      int[] aray = new int[5]; // declaring array of size 5
      // initializing the array
      aray[0] = 11;
      aray[1] = 21;
      aray[2] = 13;
      aray[3] = 23;
      aray[4] = 30;
      // printing the elements of array
	  System.out.println("Elements of the given array: ");
	  for(int elm : aray) {
	     System.out.print(elm + " "); 
	  }
	  System.out.println();
	  // printing the length of array
      System.out.println("Length of the given array: " + aray.length); 
   }
}   

Output

#

Elements of the given array: 
11 21 13 23 30 
Length of the given array: 5

在上面的程式碼中，我們宣告了一個大小為5的數組，這意味著它可以儲存最多5個元素。然後，使用for-each循環，我們檢索了所有的元素，並且藉助length屬性確定了給定數組的大小。

Example 2

的中文翻譯為：

範例2

In this example, we will declare and initialize a String array. Then, using a for-each loop, we will print its element. In the end, with the help length property, we determine the size of given array.

import java.util.*;
public class Example2 {
   public static void main(String[] args) {
      // declaration and initialization of the array
      String[] aray = { "Tutorix", "Tutorials", "Point", "Simply", "Easy",
         "Learning"            
         }; 
	  // printing the elements of array
	  System.out.println("Elements of the given array: ");
	  for(String elm : aray) {
	     System.out.print(elm + " "); 
      }
	  System.out.println();
	  // printing the length of array
      System.out.println("Length of the given array: " + aray.length); 
   }
}

Output

#

Elements of the given array: 
Tutorix Tutorials Point Simply Easy Learning 
Length of the given array: 6

Example 3

This is another example where we will find the size of an array without using any in-built property or method of Java.

方法

• 宣告並初始化兩個陣列。一個是字串數組，另一個是整數數組

• 然後，定義兩個整數類型的計數變數來儲存兩個陣列的元素數量。

• Now, use the for-each loop to iterate and increment the counter variable by one with each iteration.

• 最後，列印結果並退出。

#

import java.util.*;
public class Example3 {
   public static void main(String[] args) {
      // declaration and initialization of the arrays
      String[] aray1 = { "Tutorix", "Tutorials", "Point", "Simply", "Easy",
         "Learning"            
         }; 
      int[] aray2 = {58, 66, 74, 55, 62};
      // initial counter variable to store the count of elements
      int countr1 = 0;
      int countr2 = 0;
	  // printing the length of both arrays
	  for(String elm : aray1) {
	     countr1++;
	  }
	  for(int elm : aray2) {
	     countr2++;
	  }
      System.out.println("Length of the String array: " + countr1); 
      System.out.println("Length of the integer array: " + countr2); 
   }
}

Output

#

Length of the String array: 6
Length of the integer array: 5

結論

在本文中，我們透過範例程式學習了使用length屬性來確定給定數組的大小。此外，我們還討論了一種在不使用任何內建方法和屬性的情況下找到數組長度的方法。

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