예제

<aside> 🎯

package generic.ex4;

import generic.animal.Animal;

public class AnimalMethod {

    public static <T extends Animal> void checkup(T t) {
        System.out.println("동물 이름 : " + t.getName());
        System.out.println("동물 크기 : " + t.getSize());
        t.sound();
    }

    public static <T extends Animal> T getBigger(T t1, T t2) {
        return t1.getSize() > t2.getSize() ? t1:t2;
    }
}
------------------------
package generic.ex4;

import generic.animal.Cat;
import generic.animal.Dog;

public class MethodMain2 {

    public static void main(String[] args) {
        Dog dog = new Dog("멍멍이", 100);
        Cat cat = new Cat("냐옹이", 100);

        AnimalMethod.checkup(dog);
        AnimalMethod.checkup(cat);

        Dog targetDog = new Dog("큰 멍멍이", 200);
        Dog bigger = AnimalMethod.getBigger(dog, targetDog);
        System.out.println("bigger = " + bigger);
    }
}

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제네릭 타입과 제네릭 메서드의 우선순위

<aside> 🎣

package generic.ex4;

import generic.animal.Animal;

public class ComplexBox<T extends Animal> {

    private T animal;

    public void set(T animal){
        this.animal = animal;
    }

    public <T> T printAndReturn(T t) {
        System.out.println("animal.className : " + animal.getClass().getName());
        System.out.println("t.className : " + t.getClass().getName());

        return t;
    }
}
----------------------------
package generic.ex4;

import generic.animal.Cat;
import generic.animal.Dog;

public class MethodMain3 {

    public static void main(String[] args) {
        Dog dog = new Dog("멍멍이", 100);
        Cat cat = new Cat("냐옹이", 50);

        ComplexBox<Dog> hospital = new ComplexBox<>();
        hospital.set(dog);

        Cat returnCat = hospital.printAndReturn(cat);
        System.out.println("returnCat = " + returnCat);
    }
}

출력
animal.className : generic.animal.Dog //ComplexBox의 printAndReturn 호출
t.className : generic.animal.Cat ////ComplexBox의 printAndReturn 호출
returnCat = Aniaml{name='냐옹이', size=50} //return받아 MethodMain3 호출,
																				  //그대로 본인 값을 출력
																				  //toString() 존재하여 해당 틀 존재		

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