7/20 복습

//생성자 클래스간 함수이름 대문자 인수 소문자

}

}

//생성자 지우고 오른쪽클릭 source ->construct ->super class

// check generate->생성해줌

package pack01;
class Tiger{
    int a,b,c;
    Lion lion;
    Tiger(Lion lion){
        System.out.println("호랑이 생성");
        this.lion = lion;
    }
    void func01() {
    }
    void func02() {
        lion.func03();
    }
    void func04() {
        lion.func03();
    }
}
class Lion{
    int a,b,c;
    Lion(){
        System.out.println("사자 생성자 콜");
    }
    void func03() {
        System.out.println("함수3번콜");
    }
}
public class Hello {
    public static void main(String[] args) {
        Tiger t1 = new Tiger(new Lion());
        t1.func02();
        t1.func04();
        
    }
}

사자가먼저출력 출력순서

 
package pack01;
class Tiger{
    int a,b,c;
    Tiger(){
        System.out.println("생성자 콜");
    }
}
public class Hello { //타입 = 대입 , 객체 = 공유
    public static void main(String[] args) {
        Tiger 현성 = new Tiger();
        현성.a=10;
        System.out.println(현성);
        Tiger 멋쟁이;
        멋쟁이 = 현성;
        System.out.println(멋쟁이);
        System.out.println(멋쟁이.a);
        멋쟁이.a = 100;
        System.out.println(현성.a );
        Tiger 성민 = new Tiger();
        System.out.println(성민);
        멋쟁이=성민;
        System.out.println(멋쟁이);
        Tiger 곰돌이;
        곰돌이 =멋쟁이;
        System.out.println(곰돌이);
        현성=곰돌이;
        System.out.println(현성);
        성민 = new Tiger();
        System.out.println(성민);
        System.out.println(곰돌이);
    }
}
 

package pack01;
class Tiger{
    int a,b,c;
    void func01(Lion lion) {//=new Lion();[Lion lion = new Lion();]
        System.out.println(lion);
    }
 
}
class Lion{
    int a,b,c;
}
public class Hello { //타입 = 대입 , 객체 = 공유
    public static void main(String[] args) {
        Tiger t1 = new Tiger();
        t1.func01(new Lion());//()괄호 넣자!lion-PACK01.Lion@1560810
        t1.func01(new Lion());//         lion-PACK01.Lion@25154f
        System.out.println("-----");
        Lion l1 = new Lion();
        System.out.println(l1);//PACK01.Lion@10dea4e
        t1.func01(l1);//PACK01.Lion@10dea4e
        t1.func01(l1);//PACK01.Lion@10dea4e
        Lion l2;
        l2=l1;//l1이랑l2은 같은인물
        System.out.println(l2);//PACK01.Lion@10dea4e
        t1.func01(l1);//PACK01.Lion@10dea4e
        t1.func01(l2);//PACK01.Lion@10dea4e
    }
}