Java编程—在测试中考虑多态

public class Test1 {  public static void main(String[] args){    Unicycle unicycle = new Unicycle("Unicycle");    Bicycle bicycle = new Bicycle("Bicycle");    Tricycle tricycle = new Tricycle("Tricycle");    Cycle.ride(unicycle);    Cycle.ride(bicycle);    Cycle.ride(tricycle);  }}class Cycle{  private String name;  public Cycle(String str){    name = str;  }  public static void ride(Cycle c){    System.out.println(c.name + "is riding");  }}class Unicycle extends Cycle{  private String name;  public Unicycle(String str) {    super(str);    name = str;  }}class Bicycle extends Cycle{  private String name;  public Bicycle(String str) {    super(str);    name = str;  }}class Tricycle extends Cycle {  private String name;  public Tricycle(String str) {    super(str);    name = str;  }}