방치하기

import java.awt.event.*; import java.awt.*; class Fram extends Frame { public Fram(){ super("윈도우 이벤트"); //setLayout(new FlowLayout()); 플로우 레이아웃 //setLayout(new GridLayout(3,2));그리드 레이아웃 setLayout(new BorderLayout()); add(new Button("button 01"),"East"); add(new Button("button 01"),"West"); add(new Button("button 01"),"Center"); add(new Button("button 01"),"North"); add(new Button("button 01"),"S..

import java.util.*; import java.io.*; class StringTest { public static void main(String[] args) throws Exception { StringBuffer a=new StringBuffer(); BufferedReader scan01=newBufferedReader(new InputStreamReader(System.in)); String st = scan01.readLine(); System.out.println(st); a.append(st); StringTokenizer str=new StringTokenizer(st," "); int count=str.countTokens(); System.out.println(count);..

class StringTest03 { public static void main(String[] args) { int a=0; StringBuffer str01 =new StringBuffer(); str01.append("You know I still love you baby And it will never change. I want nobody nobody but you!I want nobody nobody but you!난 다른 사람이 싫어, 니가 아니면 싫어.I want nobody, nobody, nobody, nobody난 싫은데 왜 날 밀어내려고 하니자꾸 내 말은 듣지 않고왜 이렇게 다른 남자에게 날 보내려 하니어떻게 이러니 "); System.out.println(find(a,str01))..

class StringTest03 { public static void main(String[] args) { StringBuffer str01 =new StringBuffer(); str01.append("Java"); System.out.println(str01.toString() ); str01.append(" 프로그래밍"); System.out.println(str01 ); str01.replace(0,4,"MFC"); System.out.println(str01 ); String str02= str01.substring(3); System.out.println(str01 ); System.out.println(str02 ); str01.deleteCharAt(1); System.out.print..

import java.io.*; import java.util.*; class WrapperTest { public static void main(String[] args) { /*Integer num01 =new Integer(10); Integer num02 =new Integer("20"); int n01=num01.intValue(); //기본형 데이터로 강제적 변환 int n02=num02.intValue(); int sum=n01+n02; System.out.println(sum); System.out.println(Integer.toBinaryString(sum)); System.out.println(Integer.toOctalString(sum)); System.out.println(Int..

class WrapperTest { public static void main(String[] args) { Integer num01 =new Integer(10); Integer num02 =new Integer("20"); int n01=num01.intValue(); //기본형 데이터로 강제적 변환 int n02=num02.intValue(); int sum=n01+n02; System.out.println(sum); System.out.println(Integer.toBinaryString(sum)); System.out.println(Integer.toOctalString(sum)); System.out.println(Integer.toHexString(sum));//다 문자열로 반환 시켜주는 ..

// Singleton.java public final class Singleton { // Singleton object to be returned by getSingletonInstance private static Singleton singleton = new Singleton();//객체 하나 만 생성 // private constructor prevents instantiation by other objects private Singleton() //행성자는 막아 놓는다 { System.err.println( "Singleton object created." ); } // return existing Singleton object public static Singleton getSingleton..

interface Lendable { abstract void checkOut(String borrower, String date); abstract void checkIn(); } class SeparateVolume implements Lendable { String requestNo; // 청구번호 String bookTitle; // 제목 String writer; // 저자 String borrower; // 대출인 String checkOutDate; // 대출일 byte state; // 대출상태 SeparateVolume(String requestNo, String bookTitle, String writer) { this.requestNo = requestNo; this.bookTitle..

abstract class AbstractDisplay { public abstract void open(); public abstract void print(); public abstract void close(); public final void display() { open(); for (int i = 0; i < 5; i++) { print(); } close(); } } class CharDisplay extends AbstractDisplay { private char ch; public CharDisplay(char ch) { this.ch = ch; } public void open() { System.out.print(""); } } class StringDisplay extends Ab..

class Parent { int a=10; public void parentPrn(){ System.out.println("슈퍼클래스 프린트 메소드 "); } } class Son extends Parent { int a=12; public void parentPrn(){ System.out.println("오버라이딩 서브클래스 프린트 메소드 "); } public void sonPrn(){ System.out.println("서브클래스 프린트 메소드 "); } } class Re { public static void main (String [] args) { Son s= new Son(); s.parentPrn(); Parent p=new Son(); p.parentPrn();// 오버라이딩 메소드는..