Java - How to create new Entry (key, value)

Java - How to create new Entry (key, value)

In Java, you can create a new Map.Entry (key-value pair) using one of the following methods:

  1. Using the AbstractMap.SimpleEntry class (Java 7 and later):

    import java.util.AbstractMap; import java.util.Map; // Create a new key-value pair Map.Entry<String, Integer> entry = new AbstractMap.SimpleEntry<>("myKey", 42);

    In this example, we create a new SimpleEntry with a key of type String ("myKey") and a value of type Integer (42).

  2. Using a custom class that implements the Map.Entry interface:

    You can also create your own custom class that implements the Map.Entry interface and define the key and value types as per your requirements. Here's an example:

    public class MyEntry<K, V> implements Map.Entry<K, V> { private final K key; private V value; public MyEntry(K key, V value) { this.key = key; this.value = value; } @Override public K getKey() { return key; } @Override public V getValue() { return value; } @Override public V setValue(V newValue) { V oldValue = value; value = newValue; return oldValue; } } // Create a new key-value pair using your custom entry class Map.Entry<String, Integer> entry = new MyEntry<>("myKey", 42);

    In this example, we create a custom MyEntry class that implements the Map.Entry interface and provides its own implementation for getKey(), getValue(), and setValue() methods.

Both of these methods allow you to create new key-value pairs (entries) in Java. You can choose the method that best suits your needs and the level of customization required for your key-value pairs.

More Tags

eclipse-classpath embedded-tomcat-7 leap-year deadlock xgboost apache-camel class-method mongoose-schema jquery-validate ubuntu-14.04

More Java Questions

More Housing Building Calculators

More Bio laboratory Calculators

More Other animals Calculators

More Organic chemistry Calculators