Java中的BigInteger compareTo（）方法-yiteyi-C++库

这个 JAVA数学大整数。compareTo（大整数值） 方法将此BigInteger与作为参数传递的BigInteger进行比较。

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语法：

public int compareTo(BigInteger val)

参数： 此方法接受一个强制参数瓦尔这是要与BigInteger对象进行比较的BigInteger。

返回： 此方法返回以下内容：

0 ：如果此BigInteger的值等于作为参数传递的BigInteger对象的值。
1. ：如果此BigInteger的值大于作为参数传递的BigInteger对象的值。
-1 ：如果此BigInteger的值小于作为参数传递的BigInteger对象的值。

例如：

Input: BigInteger1=2345, BigInteger2=7456
Output: -1
Explanation: BigInteger1.compareTo(BigInteger2)=-1.

Input: BigInteger1=9834, BigInteger2=7456
Output: 1
Explanation: BigInteger1.compareTo(BigInteger2)=1.

示例1：下面的程序演示了当两个BigInteger相等时BigInteger类的compareTo（）方法

                     // Java program to demonstrate                   
                     // compareTo() 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(                               "321456"                               );                   
                                         b2 =                               new                               BigInteger(                               "321456"                               );                   
                             
                                         // apply compareTo() method                   
                                         int                               comparevalue = b1.compareTo(b2);                   
                             
                                         // print result                   
                                         if                               (comparevalue ==                               0                               ) {                   
                             
                                         System.out.println(                               "BigInteger1 "                   
                                         + b1 +                               " and BigInteger2 "                   
                                         + b2 +                               " are equal"                               );                   
                                         }                   
                                         else                               if                               (comparevalue ==                               1                               ) {                   
                             
                                         System.out.println(                               "BigInteger1 "                               + b1 + "                   
                                         is greater than BigInteger2 " + b2);                   
                                         }                   
                                         else                               {                   
                             
                                         System.out.println(                               "BigInteger1 "                               + b1 + "                   
                                         is lesser than BigInteger2 " + b2);                   
                                         }                   
                                         }                   
                     }                   

输出：

BigInteger1 321456 and BigInteger2 321456 are equal

示例2：当BigInteger1大于BigInteger2时

                     // Java program to demonstrate                   
                     // compareTo() 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(                               "654321"                               );                   
                                         b2 =                               new                               BigInteger(                               "321456"                               );                   
                             
                                         // apply compareTo() method                   
                                         int                               comparevalue = b1.compareTo(b2);                   
                             
                                         // print result                   
                                         if                               (comparevalue ==                               0                               ) {                   
                             
                                         System.out.println(                               "BigInteger1 "                               + b1 + "                   
                                         and BigInteger2                               " + b2 + "                               are equal");                   
                                         }                   
                                         else                               if                               (comparevalue ==                               1                               ) {                   
                             
                                         System.out.println(                               "BigInteger1 "                               + b1 + "                   
                                         is greater than BigInteger2 " + b2);                   
                                         }                   
                                         else                               {                   
                             
                                         System.out.println(                               "BigInteger1 "                               + b1 + "                   
                                         is lesser than BigInteger2 " + b2);                   
                                         }                   
                                         }                   
                     }                   

输出：

BigInteger1 654321 is greater than BigInteger2 321456

例3：当BigInteger1小于BigInteger2时

                     // Java program to demonstrate                   
                     // compareTo() 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(                               "321456"                               );                   
                                         b2 =                               new                               BigInteger(                               "564321"                               );                   
                             
                                         // apply compareTo() method                   
                                         int                               comparevalue = b1.compareTo(b2);                   
                             
                                         // print result                   
                                         if                               (comparevalue ==                               0                               ) {                   
                             
                                         System.out.println(                               "BigInteger1 "                               + b1 + "                   
                                         and BigInteger2                               " + b2 + "                               are equal");                   
                                         }                   
                                         else                               if                               (comparevalue ==                               1                               ) {                   
                             
                                         System.out.println(                               "BigInteger1 "                               + b1 + "                   
                                         is greater than BigInteger2 " + b2);                   
                                         }                   
                                         else                               {                   
                             
                                         System.out.println(                               "BigInteger1 "                               + b1 + "                   
                                         is lesser than BigInteger2 " + b2);                   
                                         }                   
                                         }                   
                     }                   

输出：

BigInteger1 321456 is lesser than BigInteger2 564321

参考： BigInteger CompareTo（）文档

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