Java 中的 BigInteger compareTo()方法
原文:https://www . geesforgeks . org/big integer-compare to-method-in-Java/
Java . math . BigInteger . compare to(BigInteger 值)方法将此 BigInteger 与作为参数传递的 BigInteger 进行比较。
语法:
public int compareTo(BigInteger val)
参数:该方法接受单个强制参数值，它是要与大整数对象进行比较的大整数。
返回:该方法返回以下内容:
- 0 :如果这个 BigInteger 的值等于作为参数传递的 BigInteger 对象的值。
- 1 :如果这个 BigInteger 的值大于作为参数传递的 BigInteger 对象的值。
- -1 :如果这个 BigInteger 的值小于作为参数传递的 BigInteger 对象的值。
示例:
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:下面的程序说明了当两个 BigInteger 相等时 big integer 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);
}
}
}
Output:
BigInteger1 321456 and BigInteger2 321456 are equal
例 2:当大整数 1 大于大整数 2 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);
}
}
}
Output:
BigInteger1 654321 is greater than BigInteger2 321456
例 3:当大整数 1 小于大整数 2 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);
}
}
}
Output:
BigInteger1 321456 is lesser than BigInteger2 564321
参考:T2大整数比较()文档
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