- "다형성 (Polymorphism)" : 하나의 메소드나 클래스가 다양한 방법으로 동작하는 것
class A {}
class B extends A {}
public class PolymorphismDemo1 {
public static void main(String[] args) {
A obj = new B();
// A에 정의된 메소드를 실행하면 오버라이딩 된 B의 메소드들이 실행됨
// B에만 정의된 메소드를 실행하면 에러가 발생함
}
}
interface I {}
class C implements I {}
public class PolymorphismDemo2{
public static void main(String[] args) {
I obj = new C();
}
}
interface father {}
interface mother {}
interface programmer { public void coding(); }
interface believer{}
class Steve implements father, programmer, believer {
public void coding() {
System.out.println("fast");
}
}
class Rachel imeplments mother, programmer {
public void coding() {
System.out.println("elegance");
}
}
public class Worksapce {
pulic static void main(String[] args){
programmer employee1 = new Steve();
programmer employee2 = new Rachel();
employee1 coding();
employee2 coding();
}
}
interface I2 {
public String A();
}
interface I3 {
public String B();
}
class D implements I2, I3 {
public String A() { return "A"; }
public String B() { return "B"; }
}
public class PolymorphismDemo1 {
public static void main(String[] args) {
D obj = new D();
I2 objI2 = new D();
I3 objI3 = new D();
obj.A();
obj.B();
objI2.A();
objI2.B(); // 에러
objI3.A(); // 에러
objI3.B();
}
}
