JAVA_GUI

개념

출력 결과물 또는 입력하는 방식을 콘솔이 아닌 컴포넌트(윈도우 어플리케이션)에서 작성하는 것

종류

AWT / SWING / Java2D / JavaFX

LayoutManager

• 종류는 flow / border / grid / card / grid이 있다.
• setLayout(레이아웃 종류) 형식으로 지정한다.
• JDialog, JFrame, JWindow은 기본 값이 border로 지정된다.
• JApplet, JPanel은 기본 값이 flow로 지정된다.

FlowLayout → 왼쪽에서 부터 오른쪽으로 배치하는 레이아웃

BorderLayout → 동서남북으로 배치하는 레이아웃

GridLayout → 격자 형식으로 배치하는 레이아웃

Event Handling

예제

생성방식

public static void main(String[] args){
		JFrame f = new JFrame();
	  f.setTitle("GUI");
	  f.setSize(400,100);
	  f.setVisible(true);

}

public class UrFrame extends JFrame{
		UrFrame(){
		setTitle("GUI");
		setSize(400,100);
		setVisible(true);
	}
}
public static void main(String[] args){
		new UrFrame();
	}

public class Gui1 extends JFrame{
		Gui1(){
		setTitle("GUI");
		setSize(400,100);
		setVisible(true);
}
public static void main(String[] args){
		new Gui1();
	}
}

패널 추가 / 버튼 추가

public class Gui1 extends JFrame{
		Gui1(){
		setTitle("GUI");
		JPanel p = new JPanel();
		JLabel l = new JLabel("레이블");
		JButton b = new JButton("버튼");
		
		p.add(l);
		p.add(b);// 버튼을 패널에 추가
		add(p);  // 패널을 프레임에 추가

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // x 버튼을 눌르면 종료
		setSize(400,100);
		pack(); // 사이즈에 맞게 조절
		setVisible(true);
}
public static void main(String[] args){
		new Gui1();
	}
}

FlowLayout

public class Gui1 extends JFrame{
	Gui1(){
		setTitle("Flow Layout");
	  JPanel p = new JPanel(new FlowLayout());
		p.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT) // 오 -> 왼
		
		JButton b1 = new JButton("Buttion 1");
		JButton b2 = new JButton("Btn 2");
		JButton b3 = new JButton("B 3");
		JButton b4 = new JButton("B4");
		JButton b5 = new JButton("Buttion 55555");

		p.add(b1);
		p.add(b2);
		p.add(b3);
		p.add(b4);
		p.add(b5);

		add(p);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(250,120);
		setVisible(true);
	}
	
	public static void main(String[] args){
		new Gui1();
	}
}

BorderLayout

public class Gui1 extends JFrame{
	Gui1(){
		setTitle("Border Layout");
		setLayout(new BorderLayout());
		JButton b1 = new JButton("Buttion 1");
		JButton b2 = new JButton("Btn 2");
		JButton b3 = new JButton("B 3");
		JButton b4 = new JButton("B4");
		JButton b5 = new JButton("Buttion 55555");

		add("East",b1);
		add("South",b2);
		add("West",b3);
		add("North",b4);
		add(b5, BorderLayout.CENTER);

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(300,300);
		setVisible(true);
	}
	
	public static void main(String[] args){
		new Gui1();
	}
}

GridLayout

public class Gui1 extends JFrame{
	Gui1(){
		setTitle("Border Layout");
		setLayout(new GridLayout(0,3));
		JButton b1 = new JButton("Buttion 1");
		JButton b2 = new JButton("Btn 2");
		JButton b3 = new JButton("B 3");
		JButton b4 = new JButton("B4");
		JButton b5 = new JButton("Buttion 55555");

		add(b1);
		add(b2);
		add(b3);
		add(b4);
		add(b5);
		add(new JButton("마지막 버튼"));

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(300,300);
		setVisible(true);
	}
	
	public static void main(String[] args){
		new Gui1();
	}
}

Event Handling

ActionListener

public class Event1 extends JFrame{
    Event1(){
        setTitle("Event Handling");
				// ActionListener al = ev -> System.out.println("람다");
				// 람다식으로 간단하게 리스너 구현 가능
        ActionListener al = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println("버튼 클릭");
            }
        }; 
        JButton btn = new JButton("클릭");
        btn.addActionListener(al);
        add(btn);
				setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				setSize(500,300);
				setVisible(true);
	public static void main(String[] args)
	{
		new Event1();
	}
}

Scrollbar

public class Event1 extends JFrame{
    Event1(){
        setTitle("Scrollbar Event Handling");
				JLabel lbl = new JLabel("", JLabel.CENTER);
				JScrollBar sb = new JScrollBar(JScrollBar.VERTICAL);
				sb.setValues(50,1,0,100);
				sb.addAdjustmentListener(ev -> {
					int display = ev.getValue();
					lbl.setText("현재 위치" + display);
				});
        add("North", lbl);
				add(sb,BorderLayout.EAST);
				setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				setSize(500,300);
				setVisible(true);
	public static void main(String[] args)
	{
		new Event1();
	}
}

Text

class Event1 extends JFrame{
    Event1(){
        setTitle("Event Handling");
        setLayout(new FlowLayout());
        JTextField tf1 = new JTextField(10);
        JTextField tf2 = new JTextField(10);

        JLabel lbl = new JLabel();
        JButton b1 = new JButton("Plus");
        JButton b2 = new JButton("Minus");

        ActionListener al = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ev) {
                String s1 = tf1.getText();
                String s2 = tf2.getText();
                int a = Integer.parseInt(s1);
                int b = Integer.parseInt(s2);
                int result = 0;
                if(ev.getSource().equals(b1)){
                    result = a + b;
                }
                else if(ev.getSource().equals(b2)){
                    result = a - b;
                }
                lbl.setText(String.valueOf(result));
            }
        };
        b1.addActionListener(al);
        b2.addActionListener(al);
        add(tf1);add(tf2);add(lbl);add(b1);add(b2);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500,120);
        setVisible(true);
    }
    public static void main(String[] args){
        new Event1();
    }
}

class Event1 extends JFrame implements ActionListener{
    JTextField tf1,tf2;
    JLabel lbl;
    JButton b1,b2;
    Event1(){
        setTitle("Event Handling");
        setLayout(new FlowLayout());
        tf1 = new JTextField(10);
        tf2 = new JTextField(10);

        lbl = new JLabel();
        b1 = new JButton("Plus");
        b2 = new JButton("Minus");

        b1.addActionListener(this);
        b2.addActionListener(this);
        add(tf1);add(tf2);add(lbl);add(b1);add(b2);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500,120);
        setVisible(true);
    }
    @Override
    public void actionPerformed(ActionEvent ev) {
        String s1 = tf1.getText();
        String s2 = tf2.getText();
        int a = Integer.parseInt(s1);
        int b = Integer.parseInt(s2);
        int result = 0;
        if(ev.getSource().equals(b1)){
            result = a + b;
        }
        else if(ev.getSource().equals(b2)){
            result = a - b;
        }
        lbl.setText(String.valueOf(result));
    }
    public static void main(String[] args){
        new Event1();
    }

}