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                # 如何初始化`ArrayList` > 原文: [https://beginnersbook.com/2013/12/how-to-initialize-an-arraylist/](https://beginnersbook.com/2013/12/how-to-initialize-an-arraylist/) 在上一篇文章中,我們討論了 Java 中的類[`ArrayList`](https://beginnersbook.com/2013/12/java-arraylist/),它是重要的方法。在這里,我們分享了多種使用示例初始化`ArrayList`的方法。 ### 方法 1:使用`Arrays.asList`進行初始化 **語法:** ```java ArrayList<Type> obj = new ArrayList<Type>( Arrays.asList(Object o1, Object o2, Object o3, ....so on)); ``` **示例:** ```java import java.util.*; public class InitializationExample1 { public static void main(String args[]) { ArrayList<String> obj = new ArrayList<String>( Arrays.asList("Pratap", "Peter", "Harsh")); System.out.println("Elements are:"+obj); } } ``` 輸出: ```java Elements are:[Pratap, Peter, Harsh] ``` ### 方法 2:初始化`ArrayList`的匿名內部類方法 **Syntax:** ```java ArrayList<T> obj = new ArrayList<T>(){{ add(Object o1); add(Object o2); add(Object o3); ... ... }}; ``` **示例:** ```java import java.util.*; public class InitializationExample2 { public static void main(String args[]) { ArrayList<String> cities = new ArrayList<String>(){{ add("Delhi"); add("Agra"); add("Chennai"); }}; System.out.println("Content of Array list cities:"+cities); } } ``` 輸出: ```java Content of Array list cities:[Delhi, Agra, Chennai] ``` ### 方法 3:`ArrayList`初始化的正常方式 **語法:** ```java ArrayList<T> obj = new ArrayList<T>(); obj.add("Object o1"); obj.add("Object o2"); obj.add("Object o3"); ... ... ``` **示例:** ```java import java.util.*; public class Details { public static void main(String args[]) { ArrayList<String> books = new ArrayList<String>(); books.add("Java Book1"); books.add("Java Book2"); books.add("Java Book3"); System.out.println("Books stored in array list are: "+books); } } ``` 輸出: ```java Books stored in array list are: [Java Book1, Java Book2, Java Book3] ``` ### 方法 4:使用`Collections.ncopies` [`Collections.ncopies`](http://java.sun.com/javase/6/docs/api/java/util/Arrays.html#asList%28T...%29)方法可以在我們需要為其所有元素初始化`ArrayList`時使用相同的值。語法:`count`是元素數,`element`是項目值。 ```java ArrayList<T> obj = new ArrayList<T>(Collections.nCopies(count, element)); ``` **示例:** ```java import java.util.*; public class Details { public static void main(String args[]) { ArrayList<Integer> intlist = new ArrayList<Integer>(Collections.nCopies(10, 5)); System.out.println("ArrayList items: "+intlist); } } ``` 輸出: ```java ArrayList items: [5, 5, 5, 5, 5, 5, 5, 5, 5, 5] ```
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