Free Will

import java.awt.GridLayout; import javax.swing.JButton; import javax.swing.JFrame; public class GridLayoutEx extends JFrame { public GridLayoutEx (){ setLayout(new GridLayout(0, 4)); //GridLayout(행, 열) setTitle("GridLayout 입니다"); setSize(300, 300); setLocationRelativeTo(null); //화면 중앙에 생성 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); JButton bt1 = new JButton("버튼1"); JButton ..

import java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JFrame; public class BorderLayoutEx extends JFrame { public BorderLayoutEx (){ setLayout(new BorderLayout()); //프레임 배치관리자 setTitle("BorderLayout 입니다"); setSize(300, 300); setLocationRelativeTo(null); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); JButton bt1 = new JButton("버튼1"); JButton bt2 = new JBu..

import java.awt.FlowLayout; import javax.swing.JButton; import javax.swing.JFrame; public class FlowLayoutEx extends JFrame { public FlowLayoutEx (){ setLayout(new FlowLayout()); //프레임 배치관리자 setTitle("FlowLayout 입니다"); setSize(300, 300); setLocationRelativeTo(null); //화면 중앙에 생성 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); JButton bt1 = new JButton("버튼1"); JButton bt2 = new J..

import javax.swing.JFrame; public class Ex1 extends JFrame { public Ex1(){ setTitle("JFrame 입니다"); setSize(300, 300); setLocationRelativeTo(null); //화면 중앙에 생성 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); } public static void main(String[] args) { Ex1 e = new Ex1(); } }

class Car{ String color; int door; void drive(){ System.out.println("부릉부릉!"); } void stop(){ System.out.println("정지합니다!"); } }//end of Car class class FireEngine extends Car{ void water(){ System.out.println("물을 뿌립니다!"); } }//end of FireEngine class public class CastingTest1 { public static void main(String[] args) { Car car = null; FireEngine fe = new FireEngine(); FireEngine fe2 = null; fe.wat..

1. 컴퓨터 -> 속성 2. 고급시스템 설정 3. 고급탭 -> 환경변수 4. JAVA_HOME 설정->새로만들기 4. JAVA_HOME 설정-변수이름 : JAVA_HOME-변수값 : C:\Program Files\Java\jdk1.8.0_101->확인 5. PATH 설정시스템 변수 -> Path -> 편집 5. PATH 설정-변수 값 : C:\Program Files\Java\jdk1.8.0_101\bin;->확인(기존의 내용에 추가한다) 6. CLASSPATH 설정->새로만들기 6. CLASSPATH 설정 -변수 이름 : CLASSPATH-변수 값 : %JAVA_HOME%\lib\tools.jar;->확인 7. 테스트cmd -> java OK 7. Testcmd -> javac OK