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what is final in java

Final is used to apply restrictions on class, method, and variable.
The final class can't be inherited, final method can't be overridden,
and final variable value can't be changed. Final is a keyword
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final in java

if a variable declared as final then no class can change its value once 
it is given a value.
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java final meaning

private final String hello = "Hello World!";
/*
The keyword final states that the variable, method or class
associated will not have it's value changed.
*/
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final java

//allows for variables to be unchanged throught a program
final float constant = 12;
println(constant);  // Prints "12" to the console
constant += 6;  // ERROR! It's not possible to change a "final" value
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final Method Java

class FinalDemo {
    // create a final method
    public final void display() {
      System.out.println("This is a final method.");
    }
}

class Main extends FinalDemo {
  // try to override final method
  public final void display() {
    System.out.println("The final method is overridden.");
  }

  public static void main(String[] args) {
    Main obj = new Main();
    obj.display();
  }
}
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