程序设计: 猫大叫一声，所有的老鼠都开始逃跑，主人被惊醒。
要求： 1.要有联动性，老鼠和主人的行为是被动的。
       2.考虑可扩展性，猫的叫声可能引起其他联动效应。

public interface Number {

public int nextInt();

}
2:
import java.util.Random;

public class Cat implements Number{

private String name;
private char sex;

public Cat() {
  
}

public Cat(String aNmae, char aSex) {
  this.name = aNmae;
  this.sex = aSex;
}

public String getName() {
  return name;
}

public void setName(String name) {
  this.name = name;
}

public char getSex() {
  return sex;
}

public void setSex(char sex) {
  this.sex = sex;
}

public int nextInt() {
  
  int aInt;
  aInt = new Random().nextInt(3);
  return aInt;
}
}
3:
import java.util.Random;

public class Mouse implements Number{

private String name;
private char sex;

public Mouse() {
  
}

public Mouse(String aNmae, char aSex) {
  this.name = aNmae;
  this.sex = aSex;
}

public String getName() {
  return name;
}

public void setName(String name) {
  this.name = name;
}

public char getSex() {
  return sex;
}

public void setSex(char sex) {
  this.sex = sex;
}

public int nextInt() {
  int aInt;
  aInt = new Random().nextInt(3);
  return aInt;
}

}
4:
public class Stage {


public static void main(String[] args) {
  
  Cat cat = new Cat("Tom" , 'M');
  Mouse mouse = new Mouse("Jerry", 'M');
  int tint;
  int mint;
  tint = cat.nextInt();
  mint = mouse.nextInt();
  String result = ((tint > mint)? "抓到" : "跑了");
  System.out.println("结果为 : " + result);
  
}

}