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class ET1 { String model; } class ET2 extends ET1 { int a ; } class ET { public static void main (String [] args){ if (new ET2() instanceof ET1) { System.out.println("1상속 받았습니다 "); } if (new ET1() instanceof ET2) { System.out.println("2상속 받았습니다 "); } } }

class Shape { String name; public Shape(String name){ this.name = name; } public void draw(){ System.out.println(name +"을 그립니다."); } } class Circle extends Shape { public Circle(String name){ super(name); } public void paint(String color){ System.out.println(color + "입니다 "); } } class Triangle extends Shape { public Triangle(String name){ super(name); } } /* public void make(Circle cc){ cc.draw(..

class Point2D { protected int x=10; protected int y=20; public Point2D(int xx,int yy) { x=xx ; y=yy; } } class Point3D extends Point2D{ protected int z=30; public void print(){ System.out.println(x+" "+" "+y+" "+z); } public Point3D(){ super(123,456); System.out.println("서브 클래스 생성자 호출"); } public Point3D(int xx,int yy,int zz) { super(xx,yy); x=xx ; y=yy; z=zz; } } class Noname1 { public static v..

class Person { int age; boolean a; Person(int age,boolean a) { this.age=age; this.a=a; } public boolean IsMember(){ if(a) { return a; } else { return a; } } public int getAge(){ return this.age; } public int getMoney(){ if (age4 && age18 && age

import java.util.*; import java.io.*; class Student { private String name; private int major []=new int [3]; private int sum; private double avg=0; public void setName(){ Scanner scan=new Scanner(System.in); System.out.println("학생의 이름을 입력해주세요"); this.name =scan.next(); } public void setMajor(){ for(int i=0;i

import java.util.*; class height{ public static void main(String [] arg) { Scanner scan= new Scanner(System.in); System.out.printf("당신의 키를 입력해주세요\n"); int height=scan.nextInt(); double normal_weight=(double)((height-100)*0.9); System.out.printf("당신의 키에 표준 체중은 : %4.2f kg 입니다" , normal_weight); System.out.printf("당신의 몸무게를 입력해주세요\n"); double weight=scan.nextDouble(); if (weight==normal_weight) { Sy..

import java.util.*; import java.util.*; import java.io.*; class 숫자놀이{ public static void main(String [] arg)throws Exception { //int now=(int)(Math.random()*50)+1; 메스 랜덤 이용 int count=0; Random random =new Random(System.currentTimeMillis()); //유틸 안에 Random은 그냥도 되지만 지금처럼 시간을 불러와서 난수 생성도 가능 int now =random.nextInt(50); Scanner scan= new Scanner(System.in); System.out.println("정답입니다"+now); while (tr..

import java.util.*; import java.io.*; class WebDB { private String name; privateString id; privateString pw; //이름 관련 public WebDB(){ } public WebDB(String a){ this.name=a; } public WebDB(String a,String b){ this.name=a; this.id=b; } public WebDB(String a,String b,String c){ this.name=a; this.id=b; this.pw=c; } void setName(String a) { name=a; } String getName(String a) { setName(a); return name;..

class StaticTest { static int a =10; int b=20; } class StaticTest01 { public static void main(String [] args) { System.out.println(StaticTest.a); StaticTest s1 =new StaticTest(); StaticTest s2= new StaticTest(); System.out.println(s1.a+" "+s2.a); System.out.println(s1.b+" "+s2.b); s1.a=100; System.out.println(s1.a); System.out.println(s2.a); s1.b=200; System.out.println(s1.b); System.out.println..

import java.util.*; import java.io.*; class WebDB { private String name; privateString id; privateString pw; //이름 관련 public WebDB(){ } public WebDB(String a){ this.name=a; } public WebDB(String a,String b){ this.name=a; this.id=b; } public WebDB(String a,String b,String c){ this.name=a; this.id=b; this.pw=c; } void setName(String a) { name=a; } String getName(String a) { setName(a); return name;..