package com.zmd.common_class_libraries;

import java.math.BigInteger;

/**

 * @ClassName BigNumberExample

 * @projectName: object1

 * @author: Zhangmingda

 * @description： XXX

 * date: 2021/4/7.

 */

public class BigNumberExample {

    public static void main(String[] args) {

        BigInteger a = new BigInteger("999999999999999999999999999999999999999999");

        BigInteger b = new BigInteger("888888888888888888888888888888888888888888");

        //加法

        System.out.println(a.add(b));

        //减法

        System.out.println(a.subtract(b));

        //乘法

        System.out.println(a.multiply(b));

        //除法

        System.out.println(a.divide(b));

    }

}

package com.zmd.common_class_libraries;

import java.math.BigDecimal;

import java.math.BigInteger;

        BigDecimal a = new BigDecimal("999999999999999999999999999999999999999999.999999999999999999999999999999999999999999");

        BigDecimal b = new BigDecimal("888888888888888888888888888888888888888888.888888888888888888888888888888888888888888");

        //加法

        System.out.println(a.add(b));

        //减法

        System.out.println(a.subtract(b));

        //乘法

        System.out.println(a.multiply(b));

        //除法

        System.out.println(a.divide(b));

    }

}

package com.zmd.common_class_libraries;

        import java.math.BigDecimal;

        import java.math.BigInteger;

/**

 * @ClassName BigNumberExample

 * @projectName: object1

 * @author: Zhangmingda

 * @description： XXX

 * date: 2021/4/7.

 */

public class BigNumberExample {

    public static void main(String[] args) {

        //double精度损失

        double da = 0.05;

        double db = 0.01;

        System.out.println(da + db);

        //等于0.060000000000000005

        //BigDecimal可以解决此问题

        BigDecimal ba = new BigDecimal("0.05");

        BigDecimal bb = new BigDecimal("0.01");

        System.out.println(ba.add(bb));

        //0.06

    }

}