Question

public static String  mixColors1(String x, String y)
{
    String red="red";
    String yellow="yellow";
    String blue="blue";
    String color = null;//this line... is an issue
    if(red == x && yellow == y || red == y && yellow == x)//if red&yellow selected
        color = "orange";//return orange

    else if(red == x && blue == y || red == y && blue == x)//if red&blue selected
        color = "purple";//return purple

    else if(yellow == x && blue == y || yellow == y && blue == x)//if blue&yellow selected
        color = "green";//return green

    return color;
}

Answer 1

我不确定在color内设置if并在最后设置return时出了什么问题，但这就是你想要的：

使用以下内容替换if...else阶梯：

if(red.equals(x) && yellow.equals(y) || red.equals(y) && yellow.equals(x))//if red&yellow selected
    return "orange";
else if(red.equals(x) && blue.equals(y) || red.equals(y) && blue.equals(x))//if red&blue selected
    return "purple";
else if(yellow.equals(x) && blue.equals(y) || yellow.equals(y) && blue.equals(x))//if blue&yellow selected
    return "green";
else
    return null;  // default value, if neither orange nor purple nor green

这只是使用color语句切换return的设置。（返回内部 if语句，就像原问题一样。）

这也显示了如何正确使用您在评论中提到的.equals()方法。

Answer 2

根据您的要求..这里是代码..

 public static String  mixColors1(String x, String y)
    {
        String red="red";
        String yellow="yellow";
        String blue="blue";
        if(red.equals(x) && yellow.equals(y) || red.equals(y) && yellow.equals(x))//if red&yellow selected
            return "orange";//return orange

        else if(red.equals(x) && blue.equals(y) || red.equals(y) && blue.equals(x))//if red&blue selected
            return "purple";//return purple

        else if(yellow.equals(x) && blue.equals(y) || yellow.equals(y) && blue.equals(x))//if blue&yellow selected
            return "green";//return green
        else
        return null;            //if color won't match it will return null

    }

如何在if语句中返回我的字符串？

2 个答案: