Java:过度打字的结构？在Object []中有多种类型？

Question

术语过度类型结构=接受不同类型的数据结构,可以是原始的或用户定义的.

我认为ruby在诸如表之类的结构中支持许多类型.我在Java中尝试了一个类型为'String','char'和'File'的表但是错误.

1. 如何在Java中使用过度类型的结构？

2. 如何在声明中显示类型？在启动时怎么样？假设一个结构:

         INDEX    VAR      FILETYPE
           //0 -> file     FILE
           //1 -> lineMap  SizeSequence
           //2 -> type     char
           //3 -> binary   boolean
           //4 -> name     String
           //5 -> path     String
   

码

import java.io.*;
import java.util.*;

public class Object
{
        public static void print(char a)
        {
                System.out.println(a);
        }
        public static void print(String s)
        {
                System.out.println(s);
        }

        public static void main(String[] args)
        {
                Object[] d = new Object[6];
                d[0] = new File(".");
                d[2] = 'T';
                d[4] = ".";

                print(d[2]);
                print(d[4]);
        }
}

错误

Object.java:18: incompatible types
found   : java.io.File
required: Object
        d[0] = new File(".");
               ^
Object.java:19: incompatible types
found   : char
required: Object
        d[2] = 'T';
               ^

在对真正的问题造成滋扰之后:

d [2]存储char-type,但方法将其视为Object.我的许多方法都没有Object,所以因为这个而改变它们感觉太多了.

1. 如何在将它们作为pars之前更改类型？
2. 我应该在单独的处理课程中进行,还是有现成的方法？

码

package file;

import java.io.*;
import java.util.*;

public class ObjectTest
{
        //I have this kind of methods
        //I want them to work with Object
        // without changing the par type,
        // possible?
        public static void print(char a)
        {
                System.out.println(a);
        }
        public static void print(String s)
        {
                System.out.println(s);
        }

        public static void main(String[] args)
        {
                java.lang.Object[] d = new java.lang.Object[6];
                d[0] = (Object) new File(".");
                d[2] = (Object) new Character('T');
                d[4] = (Object) new String(".");

                print(d[2]);
                print(d[4]);
        }
        //I can get it this way working
        // but some of my methods are not Objects
        // and they need to be types like String
        private static void print(Object object) {
            System.out.println(object);
        }
}

Answer 1

您已将您的类命名为Object,因此它与java.lang.Object冲突.给它另一个名称,或者在数组声明中包含包名.例如

java.lang.Object[] d = new java.lang.Object[6];