longvalue_Java Number longValue（）方法及示例

水深无声 2023-03-05 15:53 6阅读 0赞

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## Number类longValue()方法 **(**Number Class longValue() method**)** ##

*  **longValue() method** is available in java.lang package.
    
    **longValue()方法**在java.lang包中可用。
 *  **longValue() method** is used to return the value denoted by this Number object converted to type long (by casting ) and it may involve in rounding or truncations.
    
    **longValue()方法**用于返回此Number对象表示的值，该值转换为long类型(通过强制转换)，并且可能涉及舍入或截断。
 *  **longValue() method** is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
    
    **longValue()方法**是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
 *  **longValue() method** does not throw an exception at the time of conversion from Number to long.
    
    从Number转换为long时， **longValue()方法**不会引发异常。

**Syntax:**

**句法：**

public abstract long longValue();

**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 long, it returns a converted (from type number to long) value represented by this Number object.

此方法的返回类型为long ，它返回由此Number对象表示的转换后的值(从类型编号到long)。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of longValue() method of Number class
    
    public class LongValueOfNumberClass {
        
        public static void main(String[] args) {
        
            // Variables initialization
            float f1 = 10.58f;
            double d1 = 20.62;
    
            // It returns long value denoted by this object
            // and converted to a long by calling f.longValue()
            Float f = new Float(f1);
    
            // Display f result
            System.out.println("f.longValue(): " + f.longValue());
    
            // It returns long value denoted by this object
            // and converted to a long by calling d.longValue()
            Double d = new Double(d1);
    
            // Display d result
            System.out.println("d.longValue(): " + d.longValue());
        }
    }

**Output**

**输出量**

f.longValue(): 10
    d.longValue(): 20

> 翻译自: [https://www.includehelp.com/java/number-longvalue-method-with-example.aspx][https_www.includehelp.com_java_number-longvalue-method-with-example.aspx]

longvalue

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