Ways to iterate a Map entryset keyset iterator values

Different Ways to Iterate a Map

Let's consider the following map for our example. We will Store the student name and marks in the map.

Map<String,Integer> studentMarks = new HashMap<String,Integer>();
studentMarks.put("Krishna", 100);
studentMarks.put("Peter", 65);
studentMarks.put("Mark", 75);
studentMarks.put("Sam", 90);
studentMarks.put("John", 80);

											Using EntrySet 


for(Map.Entry<String, Integer> mapEntry:studentMarks.entrySet() ){
	System.out.println("Key is " + mapEntry.getKey() + " - Value is " + mapEntry.getValue());
}

											Using KeySet

for(String key:studentMarks.keySet() ){			
	System.out.println("Key is " + key + " - Value is " + studentMarks.get(key) );				
}

											Using Values

											This can be used if you need to iterate through the values.

for(int marks:studentMarks.values()){
	System.out.println( marks );

											Using Iterator

Iterator it = studentMarks.keySet().iterator();
String key;
while(it.hasNext()){

	key = (String)it.next();
	System.out.println("Key is " + key + " - Value is " + studentMarks.get(key));