java 如何在一个方法中返回 2 个字符串：String example(String firstName, String secondName)
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How to return 2 Strings in one method: String example(String firstName, String secondName)
提问by Vikjan
Public class Example1
{
String fullname(String firstName, String secondName)
{
return firstName,secondName;
//return fullname(firstName,secondName); doesn't work either :(
}
public static void main(String[] args)
{
Example1 myname=new Example();
System.out.println(myname.fullname("John", "Wick");
}
}
I got an error though, when I run my program. Can you help me out please guys? thanks a lot
但是，当我运行我的程序时出现错误。你能帮我吗？多谢
回答by HJK
A method could return only one value at a time. Either concatenate the both the strings and return or you could use a class. set the details and return the instance of that class
一个方法一次只能返回一个值。连接两个字符串并返回，或者您可以使用一个类。设置详细信息并返回该类的实例
Approach 1:
方法一：
return firstname+"|"+secondname;
If you want those separate in calling method just use return_value.split("|"). Now you get a array of strings with 2 elements, firstname and secondname
如果您希望在调用方法中将它们分开，只需使用 return_value.split("|")。现在你得到一个包含 2 个元素的字符串数组，firstname 和 secondname
Approach 2:
方法二：
Create a class like
创建一个类
public class Person{
private String firstName;
private String secondName;
public Person(String fname, String sname){
firstname = fname;
secondname = sname;
}
// getter setters
}
in the method do
在方法中做
Person p = new Person(firstname, secondname);
return p;
回答by Danyal Sandeelo
You cannot return 2 strings at time. You can use String array though
您不能一次返回 2 个字符串。你可以使用 String 数组
public String[] fullname(String firstName, String secondName)
{
String[] names= new String[2];
names[0]=firstName;
names[1]=secondName;
return names;
}
Another logical way to solve this.. concatenate both of them and split them.
解决此问题的另一种合乎逻辑的方法.. 将它们连接起来并拆分它们。
You can use
您可以使用
List<String> nameList = new ArrayList<String>();
nameList.add(firstName);
You can use
您可以使用
Map<String,String> nameMap = new HashMap<String,String>();
nameMap.put("firstName",firstName);
nameMap.put("secondName",secondName);
There are a number of ways to use data structures.
有多种方法可以使用数据结构。
回答by Eran
A method has a single return type, so unless you package the two Strings in some class and return that class (or put the two Strings in a String array or some other container of Strings), you can only return one String.
一个方法只有一个返回类型，所以除非你将两个字符串打包在某个类中并返回那个类（或者将两个字符串放在一个字符串数组或其他字符串容器中），否则你只能返回一个字符串。
If your only requirement is to display the full name as a single String, you can simply concatenate the two Strings :
如果您的唯一要求是将全名显示为单个字符串，则可以简单地连接两个字符串：
String fullname (String firstName, String secondName)
{
return firstName + " " + secondName;
}
回答by Raj
Well you have three options
那么你有三个选择
concatenate the strings and return as a single string. Split the string at the receiving end.
Return String array
Return an object . ie set the two srings to two member variables and return the object.
连接字符串并作为单个字符串返回。在接收端拆分字符串。
返回字符串数组
返回一个对象。即将两个srings设置为两个成员变量并返回对象。
