SimpleBindings is an implementation of bindings that are supported by HashMap or any other map which is specified by the programmer.
Constructors of SimpleBindings API:
- SimpleBindings(): It is a default constructor that uses a HashMap to store the values.
- SimpleBindings(Map<String, object> m): Overloaded constructor uses an existing HashMap to store the values.
Syntax:
public class SimpleBindings extends Object implements Bindings
Implementation of SimpleBindings API :
Java
// Java Program to Implement SimpleBindings APIimport java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import javax.script.SimpleBindings;public class SimpleBindingsAPIExample { // reference of SimpleBindings class private SimpleBindings simpleBindings; // Default constructor will use a HashMap public SimpleBindingsAPIExample() { // object creating of SimpleBindings class simpleBindings = new SimpleBindings(); } // Overloaded constructor uses an existing HashMap to // store the values public SimpleBindingsAPIExample(Map<String, Object> map) { simpleBindings = new SimpleBindings(map); } // Clear all the values from the map public void clear() { simpleBindings.clear(); } // Returns true if the map contains value for the // specified key public boolean containsKey(Object key) { return simpleBindings.containsKey(key); } // Return true if the map contains values as specified public boolean containsValue(Object value) { return simpleBindings.containsValue(value); } // Returns the set of values contained in the map public Set<Map.Entry<String, Object> > entrySet() { return simpleBindings.entrySet(); } // Returns the values if specified key is exist in the // map else will return null public Object get(Object key) { return simpleBindings.get(key); } // Returns whether the map is empty or not public boolean isEmpty() { return simpleBindings.isEmpty(); } // Returns a set of the keys public Set<String> keySet() { return simpleBindings.keySet(); } // Insert the specified value associated with the // specified key public Object put(String key, Object value) { return simpleBindings.put(key, value); } // Copy all the values from another map into this map public void putAll(Map<? extends String, ? extends Object> map) { simpleBindings.putAll(map); } // Removes the value associated with the specified key public Object remove(Object key) { return simpleBindings.remove(key); } // Return the number of key-value pairs exist in the map public int size() { return simpleBindings.size(); } // Returns a collection of the values contained in map public Collection<Object> values() { return simpleBindings.values(); }}class SimpleBindingsImpl { public static void main(String[] args) { SimpleBindingsAPIExample map = new SimpleBindingsAPIExample(); map.put("1", "Ram"); map.put("2", "Shyam"); map.put("3", "Sita"); Map<String, Object> anotherMap = new HashMap<String, Object>(); anotherMap.put("4", "Geeta"); anotherMap.put("5", "Tina"); map.putAll(anotherMap); System.out.println("The key set of the map is : "); Set<String> keySet = map.keySet(); Iterator<String> itr = keySet.iterator(); while (itr.hasNext()) { System.out.print(itr.next() + "\n"); } System.out.println(); System.out.println("The values of map is : "); Collection<Object> collectionOfValues = map.values(); Iterator<Object> itrOfValues = collectionOfValues.iterator(); while (itrOfValues.hasNext()) { System.out.print(itrOfValues.next() + "\n"); } System.out.println(); System.out.println("The entry set of the map is "); Iterator<Entry<String, Object> > itrOfEntrySet; Set<Entry<String, Object> > entrySet = map.entrySet(); itrOfEntrySet = entrySet.iterator(); while (itrOfEntrySet.hasNext()) { System.out.println(itrOfEntrySet.next()); } System.out.println(); // Returns true if map contains the key 2 boolean check = map.containsKey("2"); System.out.println("The map contains key 2 ? " + check); System.out.println(); // Return true if map contains the value snigdha check = map.containsValue("Tina"); System.out.println("The map contains value Tina? " + check); System.out.println(); // Return the size of map int result = map.size(); System.out.println("The number of key-value pairs in the map are : " + result); System.out.println(); // Clear the map means delete all the key-value // pairs from the map map.clear(); // Return true if map is empty check = map.isEmpty(); System.out.println( "After clear the map, the map is empty ? " + check); System.out.println(); }} |
Output
The key set of the map is : 1 2 3 4 5 The values of map is : Ram Shyam Sita Geeta Tina The entry set of the map is 1=Ram 2=Shyam 3=Sita 4=Geeta 5=Tina The map contains key 2 ? true The map contains value Tina? true The number of key-value pairs in the map are : 5 After clear the map, the map is empty ? true
