EN
Java - iterate over values in HashMap
1 points
Short solution - using forEach() from Java 8:
xxxxxxxxxx1
Map<String, Integer> map = new HashMap<>();2
3
map.values().forEach(value -> {4
// use value variable5
System.out.println("Value: " + value);6
});Short solution - using for loop and Map values():
xxxxxxxxxx1
Map<String, Integer> map = new HashMap<>();2
3
for (Integer value : map.values()) {4
System.out.println("Value: " + value);5
}Short solution - iterate over entire map and use only values with forEach() from Java 8:
xxxxxxxxxx1
Map<String, Integer> map = new HashMap<>();2
3
map.forEach((key, value) -> {4
// we use only value variable5
System.out.println("Value : " + value);6
});Short solution - iterate over entire map with entrySet() and use only values:
xxxxxxxxxx1
Map<String, Integer> map = new HashMap<>();2
3
for (Map.Entry<String, Integer> entry : map.entrySet()) {4
// String key = entry.getKey();5
Integer value = entry.getValue();6
7
System.out.println("Value : " + value);8
}xxxxxxxxxx1
import java.util.HashMap;2
import java.util.Map;3
4
public class Example1 {5
6
public static void main(String[] args) {7
8
Map<String, Integer> map = new HashMap<>();9
map.put("A", 10);10
map.put("B", 20);11
map.put("C", 30);12
13
map.values().forEach(value -> {14
// use value variable15
System.out.println("Value: " + value);16
});17
}18
}Output:
xxxxxxxxxx1
Value: 102
Value: 203
Value: 30xxxxxxxxxx1
import java.util.HashMap;2
import java.util.Map;3
4
public class Example2 {5
6
public static void main(String[] args) {7
8
Map<String, Integer> map = new HashMap<>();9
map.put("A", 10);10
map.put("B", 20);11
map.put("C", 30);12
13
for (Integer value : map.values()) {14
System.out.println("Value: " + value);15
}16
}17
}Output:
xxxxxxxxxx1
Value: 102
Value: 203
Value: 30We can also iterate over entire map and use only values with forEach() from Java 8.
xxxxxxxxxx1
import java.util.HashMap;2
import java.util.Map;3
4
public class Example3 {5
6
public static void main(String[] args) {7
8
Map<String, Integer> map = new HashMap<>();9
map.put("A", 10);10
map.put("B", 20);11
map.put("C", 30);12
13
map.forEach((key, value) -> {14
// we use only value variable15
System.out.println("Value : " + value);16
});17
}18
}Output:
xxxxxxxxxx1
Value : 102
Value : 203
Value : 30We can also iterate over entire map with entrySet() and use only values.
xxxxxxxxxx1
import java.util.HashMap;2
import java.util.Map;3
4
public class Example4 {5
6
public static void main(String[] args) {7
8
Map<String, Integer> map = new HashMap<>();9
map.put("A", 10);10
map.put("B", 20);11
map.put("C", 30);12
13
for (Map.Entry<String, Integer> entry : map.entrySet()) {14
//String key = entry.getKey();15
Integer value = entry.getValue();16
17
System.out.println("Value : " + value);18
}19
}20
}Output:
xxxxxxxxxx1
Value : 102
Value : 203
Value : 30