提高 Java 函数可重用性相关的常见问题和错误

public int calculateTotalCost(int item1Price, int item2Price, int item3Price) {
    return item1Price + item2Price + item3Price;
}

public int calculateTotalCost(List<Integer> prices) {
    int total = 0;
    for (int price : prices) {
        total += price;
    }
    return total;
}

public void doSomething(Object obj) {
    // TODO: Implement this method
}

/**
 * Performs some action on the given object.
 *
 * @param obj  the object to act on
 */
public void doSomething(Object obj) {
    // ...
}

public boolean isNegative(int number) {
    int min = 0;  // Local variable
    return number < min;
}

private static final int MIN = 0;

public boolean isNegative(int number) {
    return number < MIN;
}

public void printNumbers(int a, int b, int c) {
    System.out.println(a);
    System.out.println(b);
    System.out.println(c);
}

public void printNumbers(int... numbers) {
    for (int number : numbers) {
        System.out.println(number);
    }
}

public <T> void generateReport(List<T> objects) {
    for (T obj : objects) {
        System.out.println(obj.toString());
    }
}