Class

class.java

package ch04;

public class classExam {
    public static void main(String[] args) {
        Student s1 = new Student(); // s1은 힙영역에 주소 값으 가지게 된다
        Student s2 = new Student();
        Student s3 = new Student();

        s1.name = "ing";
        s2.name = "lim";
        s3.name = "gam";

        s1.showInfo();
        s2.showInfo();
        s3.showInfo();

    }
}

Studnet.java

package ch04;

public class Student {
    String name;
    int num;
    String gender;
    void study(){
        System.out.println("공부 싫어");
    }
    void sleep() {
        System.out.println("자고 싶어");
    }
    void moning(){
        System.out.println("싫어 아침운동!!");
    }
    void showInfo(){
        System.out.println("이름: "+name + "학번: "+num+"성별:" + gender);
    }
}