There are multiple ways to iterate or loop a Map in Java.
Using foreach in Java 8
If you using Java 8 this is the easiest way to loop the Map.
// { autofold
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
public class Main {
public static void main(String[] args) {
// }
Using stream() in Java 8
This is also using in Java 8. If you want to filter some data while looping this is one of best way to do that.
// { autofold
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
public class Main {
public static void main(String[] args) {
// }
Using entrySet()
// { autofold
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
public class Main {
public static void main(String[] args) {
// }
Using keySet()
// { autofold
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
public class Main {
public static void main(String[] args) {
// }
Using iterator through map
This way is more suitable for when you need to remove some data while iterating.
// { autofold
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
public class Main {
public static void main(String[] args) {
// }
Using iterator through the KeySet
// { autofold
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
public class Main {
public static void main(String[] args) {
// }
Original post :- http://mydevgeek.com/6-ways-iterate-loop-map-java/
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