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public class NaNComparison {
  public static void main(String[] args) {
    double x = 0.0;
    double result = Double.NaN;Math.cos(1/x); // returns NaN if input is infinity
    if(result == Double.NaN) // compare with infinity
      System.out.println("Both are equal");
  }
}

public class NaNComparison {
  public static void main(String[] args) {
    double x = 0.0;	  
    double result = Double.NaN;Math.cos(1/x); // returns NaN if input is infinity
    if(Double.isNaN(result)) 
      System.out.println("Both are equal");
  }
}