一步一步学java之类和对象

/** *  */package demo;import java.util.Scanner;/** * @author Administrator * */public class Demo {private static Scanner in;/** * @param args */public static void main(String[] args) {Cat 小黑 = new Cat("小黑", 3, "黑色");Cat 小花 = new Cat("小花", 3, "花色");try{in = new Scanner(System.in);String s = in.nextLine();if (s.equals("黑猫")){System.out.println(小黑.toString());}else if (s.equals("花猫")){System.out.println(小花.toString());}else{System.out.println("没有这种猫，喵");}}catch (Exception e){e.printStackTrace();}   }}class Cat{private String name;private int    age;private String color;public Cat(String name, int age, String color) {super(); // 注意如果有继承关系需要调用有参数的构造函数，而不是直接用超类没有参数的构造函数this.name = name;this.age = age;this.color = color;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}@Overridepublic String toString() {return "Cat [name=" + name + ", age=" + age + ", color=" + color + "]";}}