210823_Swing(버튼)+image+Null

public class SwingNullLay_08 extends JFrame implements ActionListener{

 

Container cp;

JButton btn1,btn2,btn3;

 

//지역변수로 이미지 넣어보기

static final String ICON1="/Library/sist0730/image/Right.gif";

static final String ICON2="/Library/sist0730/image/rightDown.gif";

static final String ICON3="/Library/sist0730/image/img6.gif";

 

 

public SwingNullLay_08(String title) {

super(title);

 

cp=this.getContentPane();

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setBounds(200,300,400,400);  //정사각형

cp.setBackground(new Color(155,155,200));

 

initDesign();

this.setVisible(true);

}

 

 

//디자인

public void initDesign() {

 

//레이아웃 없애고 직접배치

this.setLayout(null);

 

//버튼1

btn1=new JButton("Hello"); //버튼생성

//위치,크기

btn1.setBounds(10, 20, 80, 40);  //x,y,w,h

//프레임에추가

this.add(btn1);

 

//버튼2

btn2=new JButton("자바",new ImageIcon(ICON3));  

btn2.setBounds(10, 70, 100, 50);

this.add(btn2);

 

//버튼3

btn3=new JButton(new ImageIcon(ICON1));

btn3.setBounds(150, 20, 80, 80);

btn3.setPressedIcon(new ImageIcon(ICON2));

this.add(btn3);

 

//이벤트

btn1.addActionListener(this);  //this는 이벤트 클래스를 가지고 있는 인스턴스

btn2.addActionListener(this);

btn3.addActionListener(this);

}

 

 

public static void main(String[] args) {

 

        new SwingNullLay_08("이미지아이콘 연습");

}

    //이벤트 쇼메세지

@Override

public void actionPerformed(ActionEvent e) {

 

Object ob=e.getSource();  //JButton ob=(JButton)e.getSource(); 버튼으로 형변환해도 됨

 

if(ob==btn1)

JOptionPane.showMessageDialog(this, "Hello 클릭");

else if(ob==btn2)

JOptionPane.showMessageDialog(this, "자바 클릭");

else if(ob==btn3)

JOptionPane.showMessageDialog(this, "오른쪽 클릭");

}

}