enumset.allof_Java EnumSet allOf（）方法与示例

矫情吗；* 2023-03-05 12:53 34阅读 0赞

enumset.allof

## EnumSet类的allOf()方法 **(**EnumSet Class allOf() method**)** ##

*  **allOf() method** is available in java.util package.
    
    **allOf()方法**在java.util包中可用。
 *  **allOf() method** is used to return Enumset that has all of the elements of the given element type (ele\_ty).
    
    **allOf()方法**用于返回具有给定元素类型(ele\_ty)的所有元素的Enumset。
 *  **allOf() method** is a static method, so it is accessible with the class name and if we try to access the method with the class object then we will not get an error.
    
    **allOf()方法**是静态方法，因此可以使用类名进行访问，如果我们尝试使用类对象访问该方法，则不会收到错误。
 *  **allOf() method** may throw an exception at the time of returning EnumSet object.
    
    返回EnumSet对象时， **allOf()方法**可能会引发异常。
    
    **NullPointerException**: This exception may throw when the given parameter is null exists.
    
    **NullPointerException** ：当给定参数为null时，可能引发此异常。

**Syntax:**

**句法：**

public static EnumSet allOf(Class ele_ty);

**Parameter(s):**

**参数：**

*  Class ele\_ty – represent the element type (ele\_ty) class for this Enumset.
    
    ele\_ty类 –表示此Enumset的元素类型(ele\_ty)类。

**Return value:**

**返回值：**

The return type of this method is EnumSet, it retrieves Enumset that have set of elements for this Enum.

此方法的返回类型为EnumSet ，它检索具有此Enum元素集的Enumset。

**Example:**

**例：**

// Java program is to demonstrate the example of
    // allOf(Class ele_ty) method of EnumSet
    
    import java.util.*;
    
    public class AllOfEnumSet {
        
        // Initialize a enum variable
        // with some constants
    
        public enum Colors {
        
            RED,
            BLUE,
            GREEN,
            PURPLE,
            YELLOW
        };
    
        public static void main(String[] args) {
        
            // Here , we are creating an empty EnumSet
            EnumSet < Colors > es = null;
    
            // Display EnumSet
            System.out.println("EnumSet: " + es);
    
            // By using allOf() method is to 
            // get all of the elements of an enum 
            // and put into an es
            es = EnumSet.allOf(Colors.class);
    
            // Display Modified EnumSet
            System.out.println("Updated set: " + es);
        }
    }

**Output**

**输出量**

EnumSet: null
    Updated set: [RED, BLUE, GREEN, PURPLE, YELLOW]

> 翻译自: [https://www.includehelp.com/java/enumset-allof-method-with-example.aspx][https_www.includehelp.com_java_enumset-allof-method-with-example.aspx]

enumset.allof

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