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Java AbstractCollection类的toArray()方法

2024-05-02 17:12:03 484

在toArray()该班类AbstractCollection方法用来返回这个集合中的元素。元素以数组形式返回。

语法如下

public Object[] toArray()

要使用Java中的AbstractCollection类，请导入以下包

import java.util.AbstractCollection;

首先，声明AbstractCollection并添加一些元素

AbstractCollection<Object> absCollection = new ArrayList<Object>();
absCollection.add("Laptop");
absCollection.add("Tablet");
absCollection.add("Mobile");
absCollection.add("E-Book Reader");

现在，使用该toArray()方法以数组形式返回元素

Object[] myArr = absCollection.toArray();

以下是toArray()在Java中实现AbstractCollection方法的示例

示例

import java.util.ArrayList;
import java.util.AbstractCollection;
public class Demo {
   public static void main(String[] args) {
      AbstractCollection<Object> absCollection = new ArrayList<Object>();
      absCollection.add("Laptop");
      absCollection.add("Tablet");
      absCollection.add("Mobile");
      absCollection.add("E-Book Reader");
      absCollection.add("SSD");
      absCollection.add("HDD");
      System.out.println("AbstractCollection = " + absCollection);
      System.out.println("Count of Elements in the AbstractCollection = " + absCollection.size());
      Object[] myArr = absCollection.toArray();
      System.out.println("Array returning the elements of this collection = ");
      for (int i = 0; i < myArr.length; i++)
         System.out.println(myArr[i]);
   }
}

输出结果

AbstractCollection = [Laptop, Tablet, Mobile, E-Book Reader, SSD, HDD]
Count of Elements in the AbstractCollection = 6
Array returning the elements of this collection =
Laptop
Tablet
Mobile
E-Book Reader
SSD
HDD

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Java AbstractCollection类的toArray()方法

示例

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