Java ArrayList remove（）方法与示例

今天药忘吃喽~ 2023-03-05 15:52 19阅读 0赞

## ArrayList类remove()方法 **(**ArrayList Class remove() method**)** ##

**Syntax:**

**句法：**

public boolean remove(Object obj);
        public T remove(int indices);

*  **remove() method** is available in java.util package.
    
    **remove()方法**在java.util包中可用。
 *  **remove(Object obj) method** is used to delete the first occurrence of the given object from this Arraylist when exists.
    
    **remove(Object obj)方法**用于从存在的Arraylist中删除给定对象的第一次出现。
 *  **remove(int indices) method** is used to delete the element at the given indices from this Arraylist & shift other elements to the left side.
    
    **remove(int index)方法**用于从此Arraylist中删除给定索引处的元素，并将其他元素移到左侧。
 *  **remove(Object obj) method** does not throw an exception at the time of removing an element.
    
    **remove(Object obj)方法**在删除元素时不会引发异常。
 *  **remove(obj int indices) method** may throw an exception at the time of removing an element at the given indices.
    
    **remove(obj int index)方法**可能会在移除给定索引处的元素时引发异常。
    
    **IndexOutOfBoundsException**: This exception may throw when the given indices are not in a range.
    
    **IndexOutOfBoundsException** ：如果给定索引不在范围内，则可能引发此异常。
 *  These are non-static methods, it is accessible with class object & if we try to access these methods with the class name then we will get an error.
    
    这些是非静态方法，可通过类对象访问；如果尝试使用类名称访问这些方法，则会收到错误消息。

**Parameter(s):**

**参数：**

*  In the first case, **remove(Object obj)**
    
    在第一种情况下， **删除(Object obj)**
    
     *  Object obj – represents the object to be removed from this Arraylist when exists.
     *  Object obj –表示要从此Arraylist中删除的对象(如果存在)。
 *  In the second case, **remove (int indices)**
    
    在第二种情况下， **删除(int索引)**
    
     *  int indices – represent the indices of the element to be removed from this Arraylist.
     *  int index –表示要从此Arraylist中删除的元素的索引。

**Return value:**

**返回值：**

In the first case, the return type of the method is boolean, it returns *true* if the given object is to be removed from the Arraylist when exists.

在第一种情况下，该方法的返回类型为boolean ，如果给定对象(如果存在)要从Arraylist中移除，则返回*true* 。

In the second case, the return type of the method is T, it returns the removed element from this Arraylist.

在第二种情况下，方法的返回类型为T ，它返回从此Arraylist中移除的元素。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of remove() method of ArrayList.
    
    import java.util.*;
    
    public class RemoveOfArrayList {
        
        public static void main(String[] args) {
        
            // Create an ArrayList with initial 
            // capacity of storing elements
    
            ArrayList < String > arr_l = new ArrayList < String > (10);
    
            // By using add() method is to add 
            // elements in this ArrayList
    
            arr_l.add("C");
            arr_l.add("C++");
            arr_l.add("JAVA");
            arr_l.add("DOTNET");
            arr_l.add("PHP");
    
            // Display ArrayList 
            System.out.println("arr_l :" + arr_l);
    
            // By using remove(Object) method is to remove
            // the given object from this ArrayList
            arr_l.remove("C++");
    
            // Display ArrayList 
            System.out.println("arr_l.remove(C++) :" + arr_l);
    
            // By using remove(int) method is to remove
            // the object at the given index from this ArrayList
            arr_l.remove(3);
    
            // Display ArrayList 
            System.out.println("arr_l.remove(3) : " + arr_l);
        }
    }

**Output**

**输出量**

arr_l :[C, C++, JAVA, DOTNET, PHP]
    arr_l.remove(C++) :[C, JAVA, DOTNET, PHP]
    arr_l.remove(3) : [C, JAVA, DOTNET]

> 翻译自: [https://www.includehelp.com/java/arraylist-remove-method-with-example.aspx][https_www.includehelp.com_java_arraylist-remove-method-with-example.aspx]

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