这个 JAVA数学大整数。longValue() 将此BigInteger转换为长值。如果此函数返回的值太大,无法放入长值中,那么它将只返回低阶64位。这种转换可能会丢失有关BigInteger值的总体大小的信息。此方法还可以返回符号相反的结果。
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语法:
public long longValue()
返回: 该方法返回一个long值,该值表示这个BigInteger的long值。
例如:
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.
示例1:下面的程序演示了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); } } |
输出:
longValue of 3214553537 : 3214553537 longValue of 76137217351 : 76137217351
示例2:当return long对于long值来说太大时。
// 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); } } |
输出:
longValue of 32145535361361525377 : -4747952786057577855 longValue of 7613721535372632367351 : -4783767069412450057
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