Java中的 BigInteger setBit() 方法

Java.math.BigInteger.setbit(index)方法返回一个Big-integer，它的值等于这个带有指定位集的Big-integer。该方法计算 (this | (1<

句法：

public BigInteger setbit(int n)

参数：该方法采用一个参数n ，该参数是指需要设置的位的索引。
返回值：该方法在设置位位置 n 后返回 BigInteger 值。
异常：当 n 为负数时，该方法可能会抛出ArithmeticException 。

例子：

Input: value = 2300 index = 1
Output: 2302
Explanation:
Binary Representation of 2300 = 100011111100
bit at index 1 is 0 so set the bit at index 1 
Now Binary Representation becomes 100011111110
and Decimal equivalent of 100011111110 is 2302

Input: value = 5482549 index = 1
Output: 5482551

下面的程序说明了 BigInteger 的 setBit(index) 方法：

Java

// Program to demonstrate setBit() method of BigInteger
 
import java.math.*;
 
public class GFG {
 
    public static void main(String[] args)
    {
 
        // Creating BigInteger object
        BigInteger biginteger = new BigInteger("2300");
 
        // Creating an integer i for index
        int i = 1;
 
        // Calling setBit() method on bigInteger at index i
        // store the return BigInteger
        BigInteger changedvalue = biginteger.setBit(i);
 
        String result = "After applying setBit at index " +
        i + " of " + biginteger+ " New Value is " + changedvalue;
 
        // Displaying the result
        System.out.println(result);
    }
}

输出：

After applying setBit at index 1 of 2300 New Value is 2302

参考： https: Java/math/BigInteger.html#setBit(int)