直接上操作,BIgInteger
import java.math.BigInteger;
public class Main {
public static void main(String[] args) {
BigInteger big1 = new BigInteger("4321342342342342");
BigInteger big2 = new BigInteger("6435634324223");
System.out.println("加法操作:" + big1.add(big2));
System.out.println("减法操作:" + big1.subtract(big2));
System.out.println("乘法操作:" + big1.multiply(big2));
System.out.println("除法操作:" + big1.divide(big2));
System.out.println("次方运算:" + big1.pow(2)); // 2次方
BigInteger[] res = big1.divideAndRemainder(big2); // 求余
System.out.println("商:" + res[0] + "、余:" + res[1]);
}
}
![](https://img2022.cnblogs.com/blog/2651506/202202/2651506-20220203182912433-1525267648.png)
如果在计算中不超过数据类型的长度,不建议使用大数字类计算,因为这种方法的性能很低。
下面是BigDecimal:
BigDecimal可以进行小数运算。
package Demo_2_3_BigDeciaml;
import java.math.BigDecimal;
import java.math.BigInteger;
public class Main {
public static void main(String[] args) {
BigDecimal big1 = new BigDecimal("123123124345346.213");
BigDecimal big2 = new BigDecimal("524576345252.542");
System.out.println("加法操作:" + big1.add(big2));
System.out.println("减法操作:" + big1.subtract(big2));
System.out.println("乘法操作:" + big1.multiply(big2));
System.out.println("次方运算:" + big1.pow(2)); // 2次方
BigDecimal[] res = big1.divideAndRemainder(big2); // 求余
System.out.println("商:" + res[0] + "、余:" + res[1]);
}
}
![](https://img2022.cnblogs.com/blog/2651506/202202/2651506-20220203182928893-1866129195.png)