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Return a shallow copy of IdentityHashMap in Java
Returning a shallow copy means to copy elements of one IdentityHashMap to another. For this, clone() method is used.
The following is an example to return a shallow copy of IdentityHashMap
Example
import java.util.*; public class Demo { public static void main(String[] args) { IdentityHashMap<String, Integer> m = newIdentityHashMap<String, Integer>(); m.put("1", 100); m.put("2", 200); m.put("3", 300); m.put("4", 150); m.put("5", 110); m.put("6", 50); m.put("7", 90); m.put("8", 250); m.put("9", 350); m.put("10", 450); System.out.println("IdentityHashMap elements
"+ m); System.out.println("Size = " + m.size()); System.out.println("
Cloned Map = " + m.clone()); 0System.out.println("Size = " + m.size()); } }
Output
IdentityHashMap elements {2=200, 4=150, 9=350, 7=90, 10=450, 6=50, 5=110, 8=250, 1=100, 3=300} Size = 10 Cloned Map = {2=200, 4=150, 9=350, 7=90, 10=450, 6=50, 5=110, 8=250, 1=100, 3=300} Size = 10
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