const

const.java

package ch06;

public class constExam {
    public static void main(String[] args) {
        ch06Exam s1 = new ch06Exam(1, "ing", "nam");

        s1.showInfo();
    }
}

ch06.java

package ch06;

public class ch06Exam {
    String name;
    int num;
    String gender;

    ch06Exam(String name, String gender){
        this.name = name;
        this.gender = "남";
    }

    ch06Exam(int num, String name, String gender){
        this(name, gender);
        this.num = num;
    }

    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);
    }
}