print map java
map.forEach((key, value) -> System.out.println(key + ":" + value));print map java
map.forEach((key, value) -> System.out.println(key + ":" + value));java map print
// 1. for-each with Entry
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());
}
// 2. for-each with key or value each (faster)
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
//iterating over keys only
for (Integer key : map.keySet()) {
System.out.println("Key = " + key);
}
//iterating over values only
for (Integer value : map.values()) {
System.out.println("Value = " + value);
}
// 3. Using Iterator
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
// With Generic
Iterator<Map.Entry<Integer, Integer>> entries = map.entrySet().iterator();
while (entries.hasNext()) {
Map.Entry<Integer, Integer> entry = entries.next();
System.out.println("Key = " + entry.getKey() + ", Value = " + 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("Key = " + key + ", Value = " + value);
}how to print the map in java
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.stream.Stream;
class MapUtil
{
// Program to print all keys present in the Map using keySet() in Java
public static void main (String[] args)
{
Map<Integer, String> map = new HashMap<>();
map.put(1, "One");
map.put(2, "Two");
// 1. using Iterator
Iterator<Integer> itr = map.keySet().iterator();
while (itr.hasNext()) {
System.out.println(itr.next());
}
// 2. For-each Loop
for (Integer key : map.keySet()) {
System.out.println(key);
}
// 3. Java 8 - Collection.iterator() + Iterator.forEachRemaining()
map.keySet().iterator()
.forEachRemaining(System.out::println);
// 4. Java 8 - Collection.stream() + Stream.forEach()
map.keySet().stream()
.forEach(System.out::println);
// Java 8 - Stream.of() + Collection.toArray() + Stream.forEach()
Stream.of(map.keySet().toArray())
.forEach(System.out::println);
// 5. Convert to String
System.out.println(map.keySet().toString());
// Java 8
Stream.of(map.keySet().toString())
.forEach(System.out::println);
}
}print map in java
Map<String, Integer> map = new HashMap<>();
map.put("a", 1);
map.put("b", 2);
System.out.println(Arrays.asList(map)); // method 1
System.out.println(Collections.singletonList(map)); // method 2Copyright © 2021 Codeinu
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