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📜  Java ArrayList和Vector之间的区别

📅  最后修改于: 2020-10-13 00:43:04             🧑  作者: Mango

ArrayList和Vector之间的区别

ArrayList和Vector都实现List接口并维护插入顺序。

但是，下面给出的ArrayList和Vector类之间有很多区别。

ArrayList Vector
1) ArrayList is not synchronized. Vector is synchronized.
2) ArrayList increments 50% of current array size if the number of elements exceeds from its capacity. Vector increments 100% means doubles the array size if the total number of elements exceeds than its capacity.
3) ArrayList is not a legacy class. It is introduced in JDK 1.2. Vector is a legacy class.
4) ArrayList is fast because it is non-synchronized. Vector is slow because it is synchronized, i.e., in a multithreading environment, it holds the other threads in runnable or non-runnable state until current thread releases the lock of the object.
5) ArrayList uses the Iterator interface to traverse the elements. A Vector can use the Iterator interface or Enumeration interface to traverse the elements.

Java ArrayList的示例

让我们看一个简单的示例，其中我们使用ArrayList来存储和遍历元素。

import java.util.*;  
class TestArrayList21{  
 public static void main(String args[]){  
   
  List al=new ArrayList();//creating arraylist  
  al.add("Sonoo");//adding object in arraylist  
  al.add("Michael");  
  al.add("James");  
  al.add("Andy");  
  //traversing elements using Iterator
  Iterator itr=al.iterator();
  while(itr.hasNext()){
   System.out.println(itr.next());
  }  
 }  
}

输出：

Sonoo
Michael
James
Andy

Java Vector的示例

让我们看一个使用Enumeration接口的Java Vector类的简单示例。

import java.util.*;    
class TestVector1{    
 public static void main(String args[]){    
  Vector v=new Vector();//creating vector
  v.add("umesh");//method of Collection
  v.addElement("irfan");//method of Vector
  v.addElement("kumar");
  //traversing elements using Enumeration
  Enumeration e=v.elements();
  while(e.hasMoreElements()){
   System.out.println(e.nextElement());
  }
 }    
}

输出：

umesh
irfan
kumar