Java 中的 BigInteger longValue()方法

原文:https://www . geesforgeks . org/big integer-long value-method-in-Java/

Java . math . BigInteger . long value()将这个 big integer 转换成一个长值。如果这个函数返回的值太大，无法放入长值，那么它将只返回低阶的 64 位。这种转换有可能会丢失关于 BigInteger 值整体大小的信息。这个方法也可以返回符号相反的结果。

语法:

public long longValue()

返回:该方法返回一个长值，代表这个大整数的长值。

示例:

Input: BigInteger1=3214558191
Output: 3214558191
Explanation: BigInteger1.longValue()=3214558191.

Input: BigInteger1=32145535361361525377
Output: -4747952786057577855
Explanation: BigInteger1.longValue()=-4747952786057577855\. This BigInteger is too big for 
longValue so it is returning lower 64 bit.

例 1:以下程序说明了 BigInteger 类的 longValue()方法

// Java program to demonstrate longValue() method of BigInteger

import java.math.BigInteger;

public class GFG {

    public static void main(String[] args)
    {

        // Creating 2 BigInteger objects
        BigInteger b1, b2;

        b1 = new BigInteger("3214553537");
        b2 = new BigInteger("76137217351");

        // apply longValue() method
        long longValueOfb1 = b1.longValue();
        long longValueOfb2 = b2.longValue();

        // print longValue
        System.out.println("longValue of "
                           + b1 + " : " + longValueOfb1);
        System.out.println("longValue of "
                           + b2 + " : " + longValueOfb2);
    }
}

Output:

longValue of 3214553537 : 3214553537
longValue of 76137217351 : 76137217351

例 2:当返回 long 对于 long 值太大时。

// Java program to demonstrate longValue() method of BigInteger

import java.math.BigInteger;

public class GFG {

    public static void main(String[] args)
    {
        // Creating 2 BigInteger objects
        BigInteger b1, b2;

        b1 = new BigInteger("32145535361361525377");
        b2 = new BigInteger("7613721535372632367351");

        // apply longValue() method
        long longValueOfb1 = b1.longValue();
        long longValueOfb2 = b2.longValue();

        // print longValue
        System.out.println("longValue of "
                           + b1 + " : " + longValueOfb1);
        System.out.println("longValue of "
                           + b2 + " : " + longValueOfb2);
    }
}

Output:

longValue of 32145535361361525377 : -4747952786057577855
longValue of 7613721535372632367351 : -4783767069412450057

参考: 大整数长值()文件

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