import java.math.BigDecimal;public class Commodity{private BigDecimal beer_price = new BigDecimal("3.5");private BigDecimal noodle_price = new BigDecimal("4.5");private BigDecimal water_price = new BigDecimal("2");private BigDecimal total_price = new BigDecimal("0");public float ...
国开Java语言程序设计形考4答案谁有？
import java.math.BigDecimal;public class Commodity{private BigDecimal beer_price = new BigDecimal("3.5");private BigDecimal noodle_price = new BigDecimal("4.5");private BigDecimal water_price = new BigDecimal("2");private BigDecimal total_price = new BigDecimal("0");public float pay(int beerNum,int noodleNum,int waterNum){payBeer(beerNum);payNoodle(noodleNum);payWater(waterNum);return total_price.floatValue();}public void payBeer(float num){BigDecimal bigDecimal;if (num > 2){bigDecimal = new BigDecimal(Double.toString(num)).multiply(beer_price).multiply(new BigDecimal("0.9"));}else{bigDecimal = new BigDecimal(Double.toString(num)).multiply(beer_price);}total_price = total_price.add(bigDecimal);}public void payNoodle(float num){BigDecimal bigDecimal;if (num > 2){bigDecimal = new BigDecimal(Double.toString(num)).multiply(noodle_price).multiply(new BigDecimal("0.9"));}else{bigDecimal = new BigDecimal(Double.toString(num)).multiply(noodle_price);}if (bigDecimal.floatValue() >= 20){bigDecimal.subtract(new BigDecimal("2"));}total_price = total_price.add(bigDecimal);}public void payWater(float num){BigDecimal bigDecimal;if (num > 2){bigDecimal = new BigDecimal(Double.toString(num)).multiply(water_price).multiply(new BigDecimal("0.9"));}else{bigDecimal = new BigDecimal(Double.toString(num)).multiply(water_price);}total_price = total_price.add(bigDecimal);}}
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public class Test{public static void main(String[] args){Commodity xiaomei = new Commodity();System.out.println("小美消费：" + xiaomei.pay(3,3,2));Commodity xiaoming = new Commodity();System.out.println("小明消费：" + xiaoming.pay(2,5,0));}}
2021-07-16
