Java 程序,将 ArrayList 转换为字符串,反之亦然
在本文中,我们将了解如何将 arrayList 转换为字符串,反之亦然。ArrayList 类是一个可调整大小的数组,可以在 java. util 包中找到。Java 中内置数组和 ArrayList 之间的区别在于,不能修改数组的大小。
以下是相同内容的演示:
假设我们的输入是 −
Input string: Java Program
期望的输出应该是 −
The array after conversion from string is: J a v a P r o g r a m
算法
Step 1 - START Step 2 - Declare namely Step 3 - Define the values. Step 4 - Create an array and add elements to it using the ‘add’ method. Step 5 - Display the list on the console. Step 6 - Create another empty array of previous array size. Step 7 - Convert it into string using the ‘toString’ method. Step 8 - Iterate over the elements and display the elements on the console. Step 9 - Stop
示例 1
import java.util.ArrayList; public class Demo { public static void main(String[] args) { System.out.println("The required packages have been imported"); ArrayList input_array= new ArrayList<>(); input_array.add("Java"); input_array.add("Python"); input_array.add("Scala"); input_array.add("JavaScript"); System.out.println("The array is defined as: " + input_array); String result_string = input_array.toString(); System.out.println("\nThe result string is: " + result_string); } }
输出
The required packages have been imported The array is defined as: [Java, Python, Scala, JavaScript] The result string is: [Java, Python, Scala, JavaScript]
示例 2
这里,我们将字符串转换为一个数组。
public class Demo { public static void main(String args[]){ String input_string = "Java Program"; System.out.println("The string is defined as: " + input_string); char[] result_array = new char[input_string.length()]; for (int i = 0; i < input_string.length(); i++) { result_array[i] = input_string.charAt(i); } System.out.println("The array after conversion from string is: " ); for (char c : result_array) { System.out.print(c + " "); } } }
输出
The string is defined as: Java Program The array after conversion from string is: J a v a P r o g r a m
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