Helping Dusting learn Java

Triangle.java

public class Triangle {

  private int a, b, c;
  
  public Triangle( int a, int b, int c ) {
    this.a = a;
    this.b = b;
    this.c = c;
  }

  public int getSide(int side) {
    if (side == 1)
      return a;
    else if (side == 2)
      return b;
    else if (side == 3)
      return c;
    else
      throw new RuntimeException("Only three sides to a triangle!");
  }

  public boolean isTriangle() {
    if ((a < b + c) ||
      (b < c + a) ||
      (c < a + b)) {
        // Triangle
        return true;
    }
    else
      return false;
  }

  public boolean isEquilateral() {
    if ((a < b + c && b == c) ||
        (b < c + a && c == a) ||
        (c < a + b && a == b)) {
      // Equilateral Triangle;
      return true;
    }
    else
      return false;
  }

  /**
   * Is this triangle a right triangle?
   */
  public boolean isRight() {
    // a^2 + b^2 == c^2
    int x = intpow(a, 2) + intpow(b, 2);
    int y = intpow(c, 2);
    if (x == y)
      return true;
    else
      return false;
  }

  // calculate an exponent for a given base
  // e.g. - 2^3 == intpow(2,3) == 8
  private int intpow (int base, int exp) {
    int x = 1;
    for( int i = 0; i < exp; i++ )
      x*=base;
    return x;
  }

}

TriangleTest.java

import java.util.Scanner;
import java.util.InputMismatchException;

public class TriangleTest {
  public static void main(String[] argv) {
    // Collect User Input
    int side1 = 0, side2 = 0, side3 = 0;
    try {
      System.out.println("Please enter three integers, each which represents the length of a triangle side.");
      Scanner input = new Scanner(System.in);
      side1 = input.nextInt();
      side2 = input.nextInt();
      side3 = input.nextInt();
    }
    catch (InputMismatchException e) {
      System.out.println("Integer Input Fail!");
      System.exit(1);
    }


    // verify user input
    if (side1 == 0 || side2 == 0 || side3 == 0) {
      System.out.println("Zero values for a side are not permitted!");
      System.exit(1);
    }

    Triangle t = new Triangle( side1, side2, side3 );
    System.out.printf("Triangle Values: (%d, %d, %d)\n", t.getSide(1), t.getSide(2), t.getSide(3));
    System.out.println("Triangle isRight: " + t.isRight());
  }
}