java 8 map foreach

Map<String, Integer> items = new HashMap<>();
items.put("A", 10);
items.put("B", 20);
items.put("C", 30);
items.put("D", 40);
items.put("E", 50);
items.put("F", 60);

items.forEach((k,v)->System.out.println("Item : " + k + " Count : " + v));

items.forEach((k,v)->{
	System.out.println("Item : " + k + " Count : " + v);
	if("E".equals(k)){
		System.out.println("Hello E");
	}
});

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3.75

Sharon Harris 105 points

                                    public void iterateUsingLambda(Map&lt;String, Integer&gt; map) {
&nbsp;&nbsp;&nbsp;&nbsp;map.forEach((k, v) -&gt; System.out.println((k + &quot;:&quot; + v)));
}

Thank you! 4

3.75 (4 Votes)

Alex Stamper 90 points

                                    public void iterateUsingStreamAPI(Map&lt;String, Integer&gt; map) {
&nbsp;&nbsp;&nbsp;&nbsp;map.entrySet().stream()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// ...
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.forEach(e -&gt; System.out.println(e.getKey() + &quot;:&quot; + e.getValue()));
}

Thank you! 0

Richard Norwood 190 points

                                    public void iterateUsingIteratorAndEntry(Map&lt;String, Integer&gt; map) {
&nbsp;&nbsp;&nbsp;&nbsp;Iterator&lt;Map.Entry&lt;String, Integer&gt;&gt; iterator = map.entrySet().iterator();
&nbsp;&nbsp;&nbsp;&nbsp;while (iterator.hasNext()) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Map.Entry&lt;String, Integer&gt; entry = iterator.next();
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(entry.getKey() + &quot;:&quot; + entry.getValue());
&nbsp;&nbsp;&nbsp;&nbsp;}
}

Thank you! 8

4 (8 Votes)

4.17

Sam Lordwit 95 points

                                    public void iterateUsingEntrySet(Map&lt;String, Integer&gt; map) {
&nbsp;&nbsp;&nbsp;&nbsp;for (Map.Entry&lt;String, Integer&gt; entry : map.entrySet()) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println(entry.getKey() + &quot;:&quot; + entry.getValue());
&nbsp;&nbsp;&nbsp;&nbsp;}
}

Thank you! 6

4.17 (6 Votes)

Gaz 105 points

                                    // 1. for-each with Entry
Map&lt;Integer, Integer&gt; map = new HashMap&lt;Integer, Integer&gt;();
for (Map.Entry&lt;Integer, Integer&gt; entry : map.entrySet()) {
    System.out.println(&quot;Key = &quot; + entry.getKey() + &quot;, Value = &quot; + entry.getValue());
}


// 2. for-each with key or value each (faster)
Map&lt;Integer, Integer&gt; map = new HashMap&lt;Integer, Integer&gt;();
//iterating over keys only
for (Integer key : map.keySet()) {
    System.out.println(&quot;Key = &quot; + key);
}
 
//iterating over values only
for (Integer value : map.values()) {
    System.out.println(&quot;Value = &quot; + value);
}


// 3. Using Iterator
Map&lt;Integer, Integer&gt; map = new HashMap&lt;Integer, Integer&gt;();
// With Generic
Iterator&lt;Map.Entry&lt;Integer, Integer&gt;&gt; entries = map.entrySet().iterator();
while (entries.hasNext()) {
    Map.Entry&lt;Integer, Integer&gt; entry = entries.next();
    System.out.println(&quot;Key = &quot; + entry.getKey() + &quot;, Value = &quot; + entry.getValue());
}

// No Generic
Map map = new HashMap();
Iterator entries = map.entrySet().iterator();
while (entries.hasNext()) {
    Map.Entry entry = (Map.Entry) entries.next();
    Integer key = (Integer)entry.getKey();
    Integer value = (Integer)entry.getValue();
    System.out.println(&quot;Key = &quot; + key + &quot;, Value = &quot; + value);
}

Thank you! 2

5 (2 Votes)

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