Test1.java Accesses instance variables in a Ship object.
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// 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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Aug 29
