How I display the content of my hash table in java
16,200
Solution 1
Sorry answered this too quickly when I got to work. I thought you were using a HashMap. Well in case you want to learn how to iterate a hash map.. here you go
Well, one way is to iterate through your map and print out the values
for (Map.Entry<String, String> entry : yourMap.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
System.out.println ("Key: " + key + " Value: " + value);
}
Solution 2
Can you just use it's toString representation? From the Oracle docs of HashTable:
String toString()
Returns a string representation of this Hashtable object in the form of a set of entries, enclosed in braces and separated by the ASCII characters ", " (comma and space).
Author by
user2976636
Updated on June 04, 2022Comments
-
user2976636 almost 2 years
I implemented a hash table and I want to display the contents, but I do not know how to do this.
Here is my driver class:
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."); } }
It is the first time that I work with hash tables and I am not sure of what I am doing.
-
user2976636 over 10 yearsThanks for the hash map hint. I am really stuck with the hash table problem.