Java 将ArrayList转换为字符串

在本文中，我们将了解如何将ArrayList转换为字符串和反之。ArrayList类是一个可调整大小的数组，在java.util包中可以找到。Java中内置数组和ArrayList之间的区别在于，数组的大小无法修改。

下面是同样的演示−

假设我们的输入是 −

Input string: Java Program

期望的输出将是： −

The array after conversion from string is:
J a v a P r o g r a m

步骤

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

在这里，我们将一个字符串转换为数组。

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