1: //ThreeD.java 2: //Three-dimensional coordinates. 4: public class ThreeD extends TwoD 5: { 6: int z; 8: public ThreeD 9: ( 10: int a, 11: int b, 12: int c 13: ) 14: { 15: super(a, b); 16: z = c; 17: } 18: }