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                # Java `ArrayList ensureCapacity()`方法 > 原文: [https://beginnersbook.com/2013/12/java-arraylist-ensurecapacity-method-example/](https://beginnersbook.com/2013/12/java-arraylist-ensurecapacity-method-example/) `ArrayList`內部實現了可擴展的動態數組,這意味著它可以自動增加和減小其大小。如果我們嘗試將一個元素添加到已經完整的`ArrayList`中,那么它會在內部自動重新調整大小以適應新元素,但有時這不是一個好方法。 考慮需要向已經完整的`ArrayList`添加大量元素的情況,在這種情況下,`ArrayList`必須調整大小數次,這將導致性能不佳。對于這種情況,`Java.util.ArrayList`類的`ensureCapacity()`方法非常有用,因為它將`ArrayList`的大小增加了指定的容量。 `public void ensureCapacity(int minCapacity)` ### 例 ```java package beginnersbook.com; import java.util.ArrayList; public class EnsureCapacityExample { public static void main(String args[]) { // ArrayList with Capacity 4 ArrayList<String> al = new ArrayList<String>(4); //Added 4 elements al.add("Hi"); al.add("Hello"); al.add("Bye"); al.add("GM"); //Increase capacity to 5 al.ensureCapacity(5); al.add("GE"); // let us print all the elements available in list for (String temp: al) { System.out.println(temp); } } } ``` 輸出: ```java Hi Hello Bye GM GE ```
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