Question

我想创建新对象并为其提供用户输入名称。

示例用户输入“robert”将匹配：

 Action robert = new Action();
 robert.eat();

我需要在程序中更改什么才能创建具有动态名称的新对象？非常感谢。我写下一个代码：

import java.util.Scanner;

public class Human {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner user_input = new Scanner( System.in );

        String first_name;
        System.out.print("Enter your first name: ");
        first_name = user_input.next( );//robert

        System.out.println("You are " + first_name);//robert

        Action first_name = new Action();
        Food orange = new Food();
        robert.eat(orange);

    }

}

Answer 1

与其他语言不同，Java无法动态创建变量名称。变量名称在代码中声明。为了实现您想要做的事情，请查看Collection Map interface。这将允许您将给定名称的用户“映射”为某个值。

快速举例：

//1) Setup the mapping, 
//The first parameter to put() is the key (perhaps a user given name?) 
//and the second parameter is actual value you want to map for that key.
//note that although I'm using a String as the key and a String as the value
//You can use pretty much any object as the value. Keys are recommended to be
//immutable objects (a String is a good one)
Map<String,String> mMap = new HashMap<String,String>();
mMap.put("John", "Orange");
mMap.put("Steve","Apple");

//2) Once the map is setup, you can then retrieve values given a key:
System.out.println("John's fruit is: "+mMap.get("John"));

More info here。

Answer 2

变量名不能在运行时指定（创建）（动态）。

Answer 3

这是不可能的。如何将Class对象的名称声明为变量。

如何通过用户输入创建新对象名称

3 个答案: