如何用java显示哈希表的内容

如何用java显示哈希表的内容,java,hashtable,Java,Hashtable,我实现了一个哈希表,我想显示内容,但我不知道怎么做 这是我的驾驶课: package myHashTable; import java.util.InputMismatchException; import java.util.Scanner; public class MyHashDrivergood{ private static String fileName = ""; private static int choice = 0; private int initialC

我实现了一个哈希表,我想显示内容,但我不知道怎么做

这是我的驾驶课:

package myHashTable;

import java.util.InputMismatchException;
import java.util.Scanner;

public class MyHashDrivergood{

private static String fileName  = "";
private static int choice   =   0;
private int initialCapacity =   0;
private static String[] testData = null;

public static void main(String[] args){

    Scanner keyboard = new Scanner(System.in);

    MyHashTableTable<String, String> dataTested = new MyHashTableTable<String,String>
                                            ()>;

while( choice != 999 ){

  try {
    System.out.println("Please enter your choice to use the HashTable: (999:
                               End of program) ");
    System.out.println("Read the files, store data in an array,  and display
                               the content: 1 ");
    System.out.println("Read the files and store the data in the HashTable, and 
                               dislay the content of the hashtable: 2");

    choice = keyboard.nextInt();
    keyboard.nextLine();
   } catch (InputMismatchException e) {
    System.out.println("Please enter only numbers!");
    keyboard.nextLine();
    continue;
   }

    switch(choice){

    case 1:
        System.out.print( "Please enter the file name to test:" );
        fileName = keyboard.next();

        testData = new String[MyHashTablegood.getFileSize( fileName )];
        testData = MyHashTablegood.getData( fileName,   
                                MyHashTablegood.getFileSize( fileName ));

        for( int j = 0;j < testData.length; j++ ){
            System.out.println( j + "  " + testData[j] );
        }

        break;

        case 2:
        System.out.print( "Please enter the file name to test:" );
        fileName = keyboard.next();

                //here I read the data from a file

        testData = new String[MyHashTablegood.getFileSize( fileName )];
        testData = MyHashTablegood.getData( fileName,  
                            MyHashTablegood.getFileSize( fileName ));

                    //now I am storing the data in my hash table
        for(int k =0; k < testData.length; k++){
            String data = testData[k];

            dataTested.put(data, data);

        }

        break;

        }
    }

    keyboard.close();

    System.out.println("The program has ended.");

}
}
包myHashTable;
导入java.util.InputMismatchException;
导入java.util.Scanner;
公共类MyHashDrivergood{
私有静态字符串fileName=“”;
私有静态int-choice=0;
私有初始容量=0;
私有静态字符串[]testData=null;
公共静态void main(字符串[]args){
扫描仪键盘=新扫描仪(System.in);
MyHashTableDataTested=新的MyHashTable
()>;
while(选项!=999){
试一试{
System.out.println(“请输入使用哈希表的选项:(999:
课程结束);;
System.out.println(“读取文件,将数据存储在数组中,然后显示
内容:1);
System.out.println(“读取文件并将数据存储在哈希表中,以及
显示哈希表的内容:2“;
choice=keyboard.nextInt();
keyboard.nextLine();
}捕获(输入不匹配异常e){
System.out.println(“请只输入数字!”);
keyboard.nextLine();
继续;
}
开关(选择){
案例1:
System.out.print(“请输入要测试的文件名:”);
fileName=键盘.next();
testData=新字符串[MyHashTablegood.getFileSize(文件名)];
testData=MyHashTablegood.getData(文件名,
getFileSize(文件名));
对于(int j=0;j

这是我第一次使用哈希表,我不知道我在做什么。

你能用它的toString表示吗?从:

返回此哈希表对象在表单中的字符串表示形式 指一组条目,用大括号括起来,用ASCII字符“,”(逗号和空格)分隔


对不起,我上班的时候回答得太快了。我以为你用的是HashMap。如果你想学习如何迭代一个散列映射。。给你

一种方法是遍历地图并打印出值

for (Map.Entry<String, String> entry : yourMap.entrySet()) {
    String key = entry.getKey();
    String value = entry.getValue();

    System.out.println ("Key: " + key + " Value: " + value);
}
for(Map.Entry:yourMap.entrySet()){
String key=entry.getKey();
字符串值=entry.getValue();
System.out.println(“键:+Key+”值:+Value);
}

感谢您提供的哈希映射提示。我真的被哈希表问题缠住了。请展示一下MyHashTable的实现。
for (Map.Entry<String, String> entry : yourMap.entrySet()) {
    String key = entry.getKey();
    String value = entry.getValue();

    System.out.println ("Key: " + key + " Value: " + value);
}