接口作为成员变量类型以及参数或返回值
作者:互联网
接口作为成员变量类型
public class Hero { private String name; private Skill skill; public void attack(){ System.out.println("我叫"+name+"开始"); skill.use(); System.out.println("完成"); } public String getName() { return name; } public void setName(String name) { this.name = name; } public Skill getSkill() { return skill; } public void setSkill(Skill skill) { this.skill = skill; } public Hero() { } public Hero(String name, Skill skill) { this.name = name; this.skill = skill; } }
public interface Skill { void use(); }
public class SkillImpl implements Skill{ @Override public void use() { System.out.println("放技能"); } }
public class DemoMain { public static void main(String[] args) { Hero hero = new Hero(); hero.setName("张三"); // hero.setSkill(new SkillImpl()); //还可以使用匿名内部类 // Skill skill = new Skill() { // @Override // public void use() { // System.out.println("释放技能"); // } // }; // hero.setSkill(skill); //同时使用匿名内部类和匿名对象 hero.setSkill(new Skill() { @Override public void use() { System.out.println("释放技能"); } }); hero.attack(); } }
运行结果:
接口作为方法的参数或返回值
public class DemoInterface { public static void main(String[] args) { //左边是接口名称,右边是实现类名称,这就是多态的写法 List<String> list = new ArrayList<>(); List<String> list1 = addNames(list); for (int i = 0; i < list1.size(); i++) { System.out.println(list1.get(i)); } } public static List<String> addNames(List<String> list){ list.add("张三"); list.add("李四"); list.add("王五"); return list; } }
运行结果:
标签:Skill,变量,void,list,接口,返回值,skill,public,name 来源: https://www.cnblogs.com/xjw12345/p/16440893.html