java bitset_Java BitSet isEmpty（）方法与示例

左手的ㄟ右手 2023-03-05 12:58 30阅读 0赞

java bitset

## BitSet类isEmpty()方法 **(**BitSet Class isEmpty() method**)** ##

*  **isEmpty() method** is available in java.util package.
    
    **isEmpty()方法**在java.util包中可用。
 *  **isEmpty() method** is used to check whether this BitSet is empty or not and in other words we can say this method is used to check when this BitSet has no true bits to set.
    
    **isEmpty()方法**用于检查此BitSet是否为空，换句话说，我们可以说此方法用于检查何时该BitSet没有要设置的真位。
 *  **isEmpty() method** is a non-static method, so it is accessible with the class object and if we try to access the method with the class name then we will get an error.
    
    **isEmpty()方法**是一个非静态方法，因此可以通过类对象进行访问，如果尝试使用类名访问该方法，则会收到错误消息。
 *  **isEmpty() method** does not throw an exception at the time of checking the empty status of this BitSet.
    
    在检查此BitSet的空状态时， **isEmpty()方法**不会引发异常。

**Syntax:**

**句法：**

public boolean isEmpty();

**Parameter(s):**

**参数：**

*  It does not accept any parameter.
    
    它不接受任何参数。

**Return value:**

**返回值：**

The return type of this method is boolean, it returns *true* when this BitSet is "blank" (i.e. no bits are set to true) otherwise it returns *false*.

此方法的返回类型是布尔值 ，当此BitSet是“空白”(即没有位被设置为true)，否则返回*false*返回*true。*

**Example:**

**例：**

// Java program to demonstrate the example 
    // of boolean isEmpty() method of BitSet.
    
    import java.util.*;
    
    public class IsEmptyOfBitSet {
        
        public static void main(String[] args) {
        
            // create an object of two BitSet
            BitSet bs1 = new BitSet(10);
            BitSet bs2 = new BitSet(10);
    
            // By using set() method is to set
            // the values in BitSet 1 
            bs1.set(10);
            bs1.set(20);
            bs1.set(30);
            bs1.set(40);
            bs1.set(50);
    
            // Display Bitset1 and BitSet2
            System.out.println("bs1: " + bs1);
            System.out.println("bs2: " + bs2);
    
            // By using isEmpty() method is to check whether
            // this bitset is empty or not empty
    
            boolean status1 = bs1.isEmpty();
            boolean status2 = bs2.isEmpty();
    
            // Display status
            System.out.println("bs1.isEmpty(): " + status1);
            System.out.println("bs2.isEmpty(): " + status2);
        }
    }

**Output**

**输出量**

bs1: {10, 20, 30, 40, 50}
    bs2: {}
    bs1.isEmpty(): false
    bs2.isEmpty(): true

> 翻译自: [https://www.includehelp.com/java/bitset-isempty-method-with-example.aspx][https_www.includehelp.com_java_bitset-isempty-method-with-example.aspx]

java bitset

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