java iterate through map
// Java program for traversing
// through a hashmap using for-each loop
import java.util.*;
class GfG {
public static void main(String[] args)
{
// Consider the hashmap containing
// student name and their marks
HashMap<String, Integer> hm =
new HashMap<String, Integer>();
// Adding mappings to HashMap
hm.put("GeeksforGeeks", 54);
hm.put("A computer portal", 80);
hm.put("For geeks", 82);
// Printing the HashMap
System.out.println("Created hashmap is" + hm);
// Loop through the hashmap
System.out.println("HashMap after adding bonus marks:");
// Using for-each loop
for (Map.Entry mapElement : hm.entrySet()) {
String key = (String)mapElement.getKey();
// Add some bonus marks
// to all the students and print it
int value = ((int)mapElement.getValue() + 10);
System.out.println(key + " : " + value);
}
}
}
// Java program to demonstrate iteration over
// Map using keySet() and values() methods
import java.util.Map;
import java.util.HashMap;
class IterationDemo
{
public static void main(String[] arg)
{
Map<String,String> gfg = new HashMap<String,String>();
// enter name/url pair
gfg.put("GFG", "geeksforgeeks.org");
gfg.put("Practice", "practice.geeksforgeeks.org");
gfg.put("Code", "code.geeksforgeeks.org");
gfg.put("Quiz", "quiz.geeksforgeeks.org");
// using keySet() for iteration over keys
for (String name : gfg.keySet())
System.out.println("key: " + name);
// using values() for iteration over keys
for (String url : gfg.values())
System.out.println("value: " + url);
}
}
// Java program to traverse through
// a hashmap using iterator
import java.util.*;
class GfG {
public static void main(String[] args)
{
// Consider the hashmap contains
// student name and their marks
HashMap<String, Integer> hm =
new HashMap<String, Integer>();
// Adding mappings to HashMap
hm.put("GeeksforGeeks", 54);
hm.put("A computer portal", 80);
hm.put("For geeks", 82);
// Printing the HashMap
System.out.println("Created hashmap is" + hm);
// Getting an iterator
Iterator hmIterator = hm.entrySet().iterator();
// Iterate through the hashmap
// and add some bonus marks for every student
System.out.println("HashMap after adding bonus marks:");
while (hmIterator.hasNext()) {
Map.Entry mapElement = (Map.Entry)hmIterator.next();
int marks = ((int)mapElement.getValue() + 10);
System.out.println(mapElement.getKey() + " : " + marks);
}
}
}