20_BigDecimal类 BigInteger类 (较大的小数、非常大的大整数)

BigDecimal类 BigInteger类:

BigDecimal类 (大数据中的较大的小数)

BigInteger类(大数据中的非常大的大整数)

BigDecimal类:

//有些时候操作小数的时候,会出现精度损失问题
//加,减,乘,除   四则运算
     System.out.println(0.09+0.01);//0.1 -->0.09999999999999999999999999 System.out.println(1.231 * 100);// 123.1--->123.100000000000000000001 //大小数四则运算 加减乘除 BigDecimal decimal1 = new BigDecimal("0.09"); BigDecimal decimal2 = new BigDecimal("0.01"); //相加运算 add() BigDecimal result01 = decimal1.add(decimal2); System.out.println(result01);// 0.10 //相减运算 subtract() BigDecimal result02 = decimal1.subtract(decimal2); System.out.println(result02);// 0.08 //相减运算 multiply() BigDecimal result03 = decimal1.multiply(decimal2); System.out.println(result03);// 0.0009 //相减运算 divide() BigDecimal result04 = decimal1.divide(decimal2); System.out.println(result04);// 9

 

BigInteger类:

//加,减,乘,除   四则运算
        BigInteger bigInteger = new BigInteger("13213514541646225541");
        BigInteger bigInteger1 = new BigInteger("12312312312313212312");
        //相加运算
        BigInteger result1 = bigInteger.add(bigInteger1);
        System.out.println(result1);//25525826853959437853
        //减法运算
        BigInteger result2 = bigInteger.subtract(bigInteger1);
        System.out.println(result2);//901202229333013229
        //乘法运算
        BigInteger result3 = bigInteger.multiply(bigInteger1);
        System.out.println(result3);
        //除法运算
        BigInteger result4 = bigInteger.divide(bigInteger1);
        System.out.println(result4);

 

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