Java API —— BigInteger类

1、BigInteger类概述       

　　可以让超过Integer范围内的数据进行运算

2、构造方法    

　　public BigInteger(String val)

3、BigInteger类成员方法

public BigInteger add(BigInteger val)：加

public BigInteger subtract(BigInteger val)：减

public BigInteger multiply(BigInteger val)：乘

public BigInteger divide(BigInteger val)：除

public BigInteger[] divideAndRemainder(BigInteger val)：返回商和余数的数组

举例1：

public class BigIntegerDemo01 {
    public static void main(String[] args) {
        Integer i = new Integer("100");
        System.out.println(i);
        System.out.println(Integer.MAX_VALUE); //2147483647
        Integer ii = new Integer("2147483647");
        System.out.println(ii);
        //NumberFormatException出错
//        Integer iii = new Integer("2147483648");
//        System.out.println(iii);
        //通过大整数创建对象
        BigInteger iii = new BigInteger("2147483648");
        System.out.println(iii); //2147483648
    }
}

举例2：

import java.math.BigInteger;
/**
 *public BigInteger add(BigInteger val)：加
 *public BigInteger subtract(BigInteger val)：减
 *public BigInteger multiply(BigInteger val)：乘
 *public BigInteger divide(BigInteger val)：除
 *public BigInteger[] divideAndRemainder(BigInteger val)：返回商和余数的数组
 */
public class BigIntegerDemo02 {
    public static void main(String[] args) {
        BigInteger bi1 = new BigInteger("100");
        BigInteger bi2 = new BigInteger("50");
        System.out.println("add:"+bi1.add(bi2));
        System.out.println("subtract:"+bi1.subtract(bi2));
        System.out.println("multiply:"+bi1.multiply(bi2));
        System.out.println("divide:"+bi1.divide(bi2));
        BigInteger[] bis = bi1.divideAndRemainder(bi2);
        System.out.println("商："+bis[0]);
        System.out.println("余数："+bis[1]);
    }
}

输出结果：

add:150

subtract:50

multiply:5000

divide:2

商：2

余数：0