Hashtable: keySet() : Hashtable « java.util « Java by API

1. Java by API
2. java.util
3. Hashtable

Hashtable: keySet()

  
/**
 *Output:
 A: 4.34
E: -9.08
D: 9.22
C: 8.0
B: 3.22

A's new balance: 1004.34
 */

import java.util.Hashtable;
import java.util.Iterator;
import java.util.Set;

public class MainClass {
  public static void main(String args[]) {
    Hashtable<String, Double> balance = new Hashtable<String, Double>();

    String str;
    double bal;

    balance.put("A", 4.34);
    balance.put("B", 3.22);
    balance.put("C", 8.00);
    balance.put("D", 9.22);
    balance.put("E", -9.08);

    Set<String> set = balance.keySet();

    Iterator<String> itr = set.iterator();
    while (itr.hasNext()) {
      str = itr.next();
      System.out.println(str + ": " + balance.get(str));
    }

    System.out.println();

    bal = balance.get("A");
    balance.put("A", bal + 1000);
    System.out.println("A's new balance: " + balance.get("A"));
  }
}

           
         
    
  

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