Java_BigInteger

BigInteger: 不可变的任意精度的整数

API: http://tool.oschina.net/apidocs/apidoc?api=jdk-zh

Example:

package javastudy;import java.math.BigInteger;/** * * api: http://tool.oschina.net/apidocs/apidoc?api=jdk-zh */public class BigIntegerBasics {    public static void main(String[] args) {        ///BigInteger(String val):  将 BigInteger 的十进制字符串表示形式转换为 BigInteger        BigInteger bi = new BigInteger("23888888888");        System.out.println(bi);        //BigInteger(String val, int radix): 将指定基数的 BigInteger 的字符串表示形式转换为 BigInteger        System.out.println(new BigInteger("110",2));      //字符串数字表示二进制        System.out.println(new BigInteger("110",10));      //字符串数字表示十进制        System.out.println(new BigInteger("110",16));      //字符串数字表示十六进制        //BigInteger(byte[] val):  将包含 BigInteger 的二进制补码表示形式的 byte 数组转换为 BigInteger        byte[] bt = "110".getBytes();        System.out.println(new BigInteger(bt));        //BigInteger(int signum, byte[] magnitude): 将 BigInteger 的符号-数量表示形式转换为 BigInteger        System.out.println(new BigInteger(1, bt));        System.out.println(new BigInteger(-1, bt));        //加减乘除        BigInteger bi1 = new BigInteger("15");        BigInteger bi2 = new BigInteger("16");        System.out.println("bi1 + bi2 = " + bi1.add(bi2));        System.out.println("bi2 - bi1 = " + bi2.subtract(bi1));        System.out.println("bi2 * bi1 = " + bi2.multiply(bi1));        System.out.println("bi2 / bi1 = " + bi2.divide(bi1));    }}