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Difference between final and constant in java

class Data {
   final int integerConstant = 20;
}
public class ConstantExample {
   public static void main(String args[]) {
      Data obj1 = new Data();
      System.out.println("value of integerConstant: "+obj1.integerConstant);
      Data obj2 = new Data();
      System.out.println("value of integerConstant: "+obj2.integerConstant);
   }
}

Source: tutorialspoint.com

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