1: //FourD.java 2: //Four-dimensional coordinates. 4: public class FourD extends ThreeD 5: { 6: int t; 8: public FourD 9: ( 10: int a, 11: int b, 12: int c, 13: int d 14: ) 15: { 16: super(a, b, c); 17: t = d; 18: } 19: }