java封装自用笔记

public class Demo0323 {
	public static void main(String[] args) {
		Animal a = new Animal();

		a.name = "大黄";


		a.show();

		//a.legs = -4;
		
		a.setLegs(-6);
		
		a.show();
		
		System.out.println(a.name);
		
		System.out.println(a.getLegs());
		
	}
}
class Animal{
	String name;
	private int age = 4;

	private int legs;
	
	
	public void setLegs(int l) {
		if(l>=0&&l%2==0) {
			legs = l;
		}
		else {
			legs = 0;
		}
	}
	
	public int getLegs() {
		return legs;
	}
	public void eat() {
		System.out.println("动物进食");
	}
	public void show() {
		System.out.println(name+" "+age);
	}
	public void setAge(int a) {
		age = a;
	}
	public int getAge() {
		return age;
	}
	
}