BigDecimal的應用

import java.math.BigDecimal;


public class DoubleDemo {


public static void main(String[] args) {
System.out.println("0.05+0.01=" + (0.05 + 0.01));
System.out.println("1.0-0.42=" + (1.0 - 0.42));
System.out.println("4.015*100=" + (4.015 * 100));
System.out.println("123.3/100=" + (123.3 / 100));


// 0.05+0.01=0.060000000000000005
// 1.0-0.42=0.5800000000000001
// 4.015*100=401.49999999999994
// 123.3/100=1.2329999999999999
BigDecimal valueOf1 = BigDecimal.valueOf(0.01);
BigDecimal valueOf2 = BigDecimal.valueOf(0.05);
System.out.println(valueOf1.add(valueOf2));// 相加0.06
System.out.println(valueOf1.subtract(valueOf2));// 相減-0.04
System.out.println(valueOf1.multiply(valueOf2));// 相乘0.0005
System.out.println(valueOf1.divide(valueOf2));// 相除0.2


}
}