Jan 02

Accesses instance variables in a Ship object.

Test1.java Accesses instance variables in a Ship object. 
********************************************************

// Create a class with five instance variables (fields):
// x, y, speed, direction, and name. Note that Ship1 is 
// not declared "public", so it can be in the same file as
// Test1. A Java file can only contain one "public" class
// definition.

class Ship1 {
  public double x, y, speed, direction;
  public String name;
}

// The "driver" class containing "main".

public class Test1 {
  public static void main(String[] args) {
    Ship1 s1 = new Ship1();
    s1.x = 0.0;
    s1.y = 0.0;
    s1.speed = 1.0;
    s1.direction = 0.0;   // East
    s1.name = "Ship1";
    Ship1 s2 = new Ship1();
    s2.x = 0.0;
    s2.y = 0.0;
    s2.speed = 2.0;
    s2.direction = 135.0; // Northwest
    s2.name = "Ship2";
    s1.x = s1.x + s1.speed
           * Math.cos(s1.direction * Math.PI / 180.0);
    s1.y = s1.y + s1.speed
           * Math.sin(s1.direction * Math.PI / 180.0);
    s2.x = s2.x + s2.speed
           * Math.cos(s2.direction * Math.PI / 180.0);
    s2.y = s2.y + s2.speed
           * Math.sin(s2.direction * Math.PI / 180.0);
    System.out.println(s1.name + " is at ("
                       + s1.x + "," + s1.y + ").");
    System.out.println(s2.name + " is at ("
                       + s2.x + "," + s2.y + ").");
  }
}
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Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017

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