Java Hashtable - rehash() Method
The java.util.Hashtable.rehash() method is used to increase the capacity of this hashtable. This method is called automatically when the number of keys in the hashtable exceeds this hashtable's capacity and load factor.
Syntax
protected void rehash()
Parameters
No parameter is required.
Return Value
void type.
Exception
NA.
Example:
In the example below, the java.util.Hashtable.rehash() method is used to increase the capacity of the given hashtable.
import java.util.*;
// extending the class to Hashtable because
// rehash() is a protected method
public class MyClass extends Hashtable<Integer, String>{
public static void main(String[] args) {
//creating hashtable
MyClass Htable = new MyClass();
//populating hashtable
Htable.put(101, "John");
Htable.put(102, "Marry");
Htable.put(103, "Kim");
Htable.put(104, "Jo");
//printing the content of the hashtable
System.out.println("Htable contains: " + Htable);
//rehash() method is used to increase the capacity
//and re-organizes internally this hashtable
Htable.rehash();
//printing size of the hashtable
System.out.println("size of Htable: " + Htable.size());
}
}
The output of the above code will be:
Htable contains: {104=Jo, 103=Kim, 102=Marry, 101=John}
size of Htable: 4
❮ Java.util - Hashtable
