如何让 ChatGPT 充当细致入微的 Java 代码优化工？ ｜ 得物技术

I want you to act as a Java software developer. I will provide you with a list of commands and you will implement them. My first request is "I need help creating a Java application."

public int calculateUsingIfElse(int a, int b, String operator) {  int result = 0;  if (operator.equals("add")) {    result = a + b;  } else if (operator.equals("subtract")) {    result = a - b;  } else if (operator.equals("multiply")) {    result = a * b;  } else if (operator.equals("divide")) {    if (b == 0) {      throw new IllegalArgumentException("Cannot divide by zero");    }    result = a / b;  } else if (operator.equals("modulus")) {    if (b == 0) {      throw new IllegalArgumentException("Cannot divide by zero");    }    result = a % b;  } else if (operator.equals("power")) {    result = (int) Math.pow(a, b);  } else if (operator.equals("square root")) {    if (a < 0) {      throw new IllegalArgumentException("Cannot take square root of negative number");    }    result = (int) Math.sqrt(a);  } else if (operator.equals("absolute value")) {    result = Math.abs(a);  } else if (operator.equals("negate")) {    result = -a;  } else {    throw new IllegalArgumentException("Invalid operator");  }  return result;}

// 定义一个接口，表示不同的运算策略public interface OperationStrategy {  int apply(int a, int b);}// 定义一个枚举，表示不同的运算符和对应的策略public enum Operator {  ADD((a, b) -> a + b),  SUBTRACT((a, b) -> a - b),  MULTIPLY((a, b) -> a * b),  DIVIDE((a, b) -> {    if (b == 0) {      throw new ArithmeticException("Cannot divide by zero");    }    return a / b;  }),  MODULUS((a, b) -> {    if (b == 0) {      throw new ArithmeticException("Cannot divide by zero");    }    return a % b;  }),  POWER((a, b) -> (int) Math.pow(a, b)),  SQUARE_ROOT((a, b) -> {    if (a < 0) {      throw new ArithmeticException("Cannot take square root of negative number");    }    return (int) Math.sqrt(a);  }),  ABSOLUTE_VALUE(Math::abs),  NEGATE(a -> -a);  private final OperationStrategy strategy;  Operator(OperationStrategy strategy) {    this.strategy = strategy;  }  public int apply(int a, int b) {    return strategy.apply(a, b);  }}// 定义一个方法，根据运算符和操作数来计算结果public int calculateUsingStrategy(int a, int b, String operatorName) {   // 根据运算符名称找到对应的枚举常量，如果没有找到则抛出异常   Operator operator = Operator.valueOf(operatorName.toUpperCase());   if (operator == null) {     throw new IllegalArgumentException("Invalid operator");   }   // 调用枚举常量的apply方法来执行相应的策略   return operator.apply(a,b);}

import org.junit.Test;import static org.junit.Assert.*;// 定义一个测试类，用@Test注解标记要执行的测试方法public class CalculatorTest {  // 定义一个测试方法，用assertEquals方法来验证计算结果是否正确  @Test  public void testAdd() {    int result = calculateUsingStrategy(3, 5, "add");    assertEquals(8, result);  }  // 定义其他的测试方法，分别测试不同的运算符和操作数  @Test  public void testSubtract() {    int result = calculateUsingStrategy(10, 4, "subtract");    assertEquals(6, result);  }  @Test  public void testMultiply() {    int result = calculateUsingStrategy(7, 9, "multiply");    assertEquals(63, result);  }  @Test  public void testDivide() {    int result = calculateUsingStrategy(12, 3, "divide");    assertEquals(4, result);  }   // 定义一个测试方法，用assertThrows方法来验证抛出了预期的异常   @Test   public void testDivideByZero() {     assertThrows(ArithmeticException.class,       () -> calculateUsingStrategy(10,0,"divide"));   }   // 定义其他的测试方法，分别测试不同的异常情况   @Test   public void testModulusByZero() {     assertThrows(ArithmeticException.class,       () -> calculateUsingStrategy(10,0,"modulus"));   }   @Test   public void testSquareRootOfNegativeNumber() {     assertThrows(ArithmeticException.class,       () -> calculateUsingStrategy(-4,-2,"square root"));   }   // 定义一个测试方法，用assertThrows方法来验证抛出了预期的异常   @Test   public void testInvalidOperator() {     assertThrows(IllegalArgumentException.class,       () -> calculateUsingStrategy(10,-2,"foo"));   }}