Java Puzzles about money computing

Java Puzzles about money computing
Java Puzzles about money computing

Java Puzzles: for monetary computation, java uses int, long, or BigDecimal for computation. Generally, we use BigDecimal.

Package com.doc tor. java. puzzle; import java. math. bigDecimal;/*** @ author sdcuike *** @ time 9:26:52 on August 18 ** java Puzzles: For Money computing, java uses int, long, or BigDecimal to calculate, generally, we use BigDecimal. ** Warning: Use the BigDecimal (String) constructor instead of BigDecimal (double ). * ** In summary, avoid float and double where exact answers are required; * for monetary calculations, use int, long, or BigDecimal. * Not all decimals can be represented exactly using binary floating-point. ** There is one caveat: Always use the BigDecimal (String) constructor, * never BigDecimal (double ). the latter constructor creates an instance with the * exact value of its argument: new BigDecimal (. (1) returns a BigDecimal representing 0.1000000000000000055511151231257827021181583404541015625. **/public class TimeForAChange {public static void main (String [] args) {System. out. println (2.00-1.10); // 0.8999999999999999 System. out. println (2.00D-1.10D); // 0.8999999999999999 System. out. println (2.00F-1.10F); // 0.9 System. out. println (Double. toString (2.00D); // 2.0 System. out. println (BigDecimal. valueOf (2.00 ). subtract (BigDecimal. valueOf (1.10); // 0.9 System. out. println (BigDecimal. valueOf (2.00F ). subtract (BigDecimal. valueOf (1.10F); // 0.899999976158142 System. out. println (BigDecimal. valueOf (2.00D ). subtract (BigDecimal. valueOf (1.10D); // 0.9 System. out. println (new BigDecimal ("2.00 "). subtract (new BigDecimal ("1.10"); // 0.90 }}