Java IdentityHashMap - clear() Method
The java.util.IdentityHashMap.clear() method is used to clear all key-value mappings of this map. This method makes the map empty with a size of zero.
Syntax
public void clear()
Parameters
No parameter is required.
Return Value
void type.
Exception
NA
Example:
In the example below, the java.util.IdentityHashMap.clear() method is used to clear all key-value mappings of the given map.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//creating a identity hash map
IdentityHashMap<Integer, String> MyMap = new IdentityHashMap<Integer, String>();
//populating the map
MyMap.put(101, "John");
MyMap.put(102, "Marry");
MyMap.put(103, "Kim");
MyMap.put(104, "Jo");
//printing the map
System.out.println("Before applying clear() method.");
System.out.println("MyMap contains: " + MyMap);
//clearing all mapping
MyMap.clear();
//printing the map again
System.out.println("\nAfter applying clear() method.");
System.out.println("MyMap contains: " + MyMap);
}
}
The output of the above code will be:
Before applying clear() method.
MyMap contains: {102=Marry, 104=Jo, 103=Kim, 101=John}
After applying clear() method.
MyMap contains: {}
❮ Java.util - IdentityHashMap
