Java 如何在一个 return 语句中返回两个字符串？
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How to return two strings in one return statement?
提问by higherDefender
public String[] decode(String message)
{
String ans1 = "hey";
String ans2 = "hi";
return {ans1 , ans2}; // Is it correct?
}
This above example does not work properly. I am getting a error.
上面的这个例子不能正常工作。我收到一个错误。
How can I achieve the initial question?
我怎样才能达到最初的问题？
采纳答案by Mark Elliot
The correct syntax would be
正确的语法是
return new String[]{ ans1, ans2 };
Even though you've created two Strings (ans1and ans2) you haven't created the Stringarray (or String[]) you're trying to return. The syntax shown above is shorthand for the slightly more verbose yet equivalent code:
即使你已经创建了两个Strings ( ans1and ans2) 你还没有创建你想要返回的String数组 (or String[])。上面显示的语法是稍微冗长但等效的代码的简写：
String[] arr = new String[2];
arr[0] = ans1;
arr[1] = ans2;
return arr;
where we create a length 2 String array, assign the first value to ans1and the second to ans2and then return that array.
其中我们创建了一个长度为2字符串数组，分配第一值ans1和所述第二对ans2，然后返回该数组。
回答by Corey Sunwold
return new String[] { ans1, ans2 };
The reason you have to do do this is just saying { ans1, ans2} doesn't actually create the object you are trying to return. All it does is add two elements to an array, but without "new String[]" you haven't actually created an array to add the elements to.
您必须这样做的原因只是说 { ans1, ans2} 实际上并没有创建您要返回的对象。它所做的只是将两个元素添加到一个数组中，但是如果没有“new String[]”，您实际上还没有创建一个数组来添加元素。
回答by Kai Chan
return new String[] {ans1 , ans2};
回答by Saeros
return new String[]{ans1,ans2};
This should work. To your other question in the comments. Since Java is strongly typed language, all the variables/results should be instantiated. Since you are not instantiating the result you want to return anywhere, we are doing the instantiation in the return statement itself.
这应该有效。对于您在评论中的其他问题。由于 Java 是强类型语言，所有变量/结果都应该被实例化。由于您没有在任何地方实例化想要返回的结果，因此我们在 return 语句本身中进行实例化。
回答by Brian
I'm only a high school student at the moment, but an easy solution that I got from a friend of mine should work. It goes like this (this is part of a project in my AP class):
我目前只是一名高中生，但我从我的朋友那里得到的一个简单的解决方案应该可行。它是这样的（这是我 AP 课程中一个项目的一部分）：
public String firstMiddleLast()
{
//returns first, middle, and last names
return (first + " " + middle + " " + last);
}
