情報科学I

CreateClass.java

class Disp
{
    void display() {
        System.out.println("No argument");
    }
    void display(String s) {
        System.out.println(s);
    }
    void display(String s, int n) {
        System.out.println(s + ", " + n);
    }
}

public class CreateClass
{
    public static void main(String args[]) {
        Disp obj = new Disp();
        obj.display();
        obj.display("Hello");
        obj.display("Hi", 100);
    }
}

Person.java

class Mine
{
    private int    no;
    private String name;
    
    void setData(int no, String name) {
        this.no = no;
        this.name = name;
    }
    
    void print() {
        System.out.println(no);
        System.out.println(name);
    }
    
    void formalPrint() {
        System.out.println("No   : " + no);        
        System.out.println("Name : " + name);        
    }
}

public class Person
{
    public static void main(String args[]) {
        Mine p = new Mine();
        p.setData(1, "Tanaka");
        p.print();
        System.out.println("----------");
        p.formalPrint();
    }
}

PrintEmp.java

class Employee
{
    private int   no;
    private String name;
    
    Employee() {
        this.no = 0;
        this.name = "No name";
    }
    Employee(int no, String name) {
        this.no = no;
        this.name = name;
    }
    static void description() {
        System.out.println("This is Program printing Emplyee data.");
        System.out.println("Have fun!");
    }
    void print() {
        System.out.println("No   : " + this.no);
        System.out.println("Name : " + this.name);
    }
    void changeData(int no, String name) {
        this.no = no;
        this.name = name;
    }
}

public class PrintEmp
{
    public static void main(String args[]) {
        Employee.description();
        System.out.println("----------------");
        Employee emp1 = new Employee(1, "Tanaka");
        emp1.print();
        System.out.println("----------------");
        Employee emp2 = new Employee();
        emp2.print();
        System.out.println("----------------");
        emp2.changeData(5, "Yamada");
        emp2.print();
        System.out.println("----------------");
    }
}