sqrt(x2 +y2)

static double hypot(double x, double y)
Returns sqrt(x2 +y2) .

public class Main {
  public static void main(String[] args) {

    System.out.println(Math.hypot(2,2));
  }
}

The output: 


2.8284271247461903
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Math:
  1. Math class
  2. Constant E and PI
  3. Get the absolute value
  4. sin, cos, tan: Trigonometric functions
  5. Cube root and square root
  6. Ceilling and flooring value
  7. Copy sign
  8. Raise the power
  9. Get exponent
  10. sqrt(x2 +y2)
  11. IEEE remainder
  12. logarithm
  13. Max, min value
  14. Next value
  15. Math Random
  16. Round to int to double
  17. Round a value to integer
  18. value * 2^ scaleFactor
  19. Get the sign
  20. Degree to Radian, and Radian to Degree
  21. Returns the size of an ulp of the argument