Math.nextAfter : Math Functions « Development « Java Tutorial

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public class FloastPointDemo {
  public static void main(String[] args) {
    // Returns the lesser adjacent of a double
    double lesserAdjacent = Math.nextAfter(123.0, 120.0);
    System.out.println("Math.nextAfter (123.0, 120.0) = " + lesserAdjacent);
  }
}

//

Math.nextAfter (123.0, 120.0) = 122.99999999999999