class Mylab

 

package java8;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Mylab {
	
	public static void main(String[] args) {
		JFrame f=new JFrame();
		
		//패널  :여러개의 컴포넌트를 담는 그릇
		JPanel panel=new JPanel();
		f.add(panel); // 프레임에 패널을 붙임
		JLabel label1=new JLabel("화씨 온도");
		JLabel label2=new JLabel("섭씨 온도");
		
		//1줄만 입력
		JTextField field1=new JTextField(15);
		JTextField field2=new JTextField(15);
		JButton button1=new JButton("화씨->섭씨");
		JButton button2=new JButton("섭씨->화씨");
		button1.setSize(50, 20);
		button2.setSize(50, 20);
		
		panel.add(label1);panel.add(field1);
		panel.add(label2);panel.add(field2);
		panel.add(button1);panel.add(button2);
		
		
		JLabel result =new JLabel("출력값");
		panel.add(result);
		
		
		button1.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				//화씨를 섭씨로  :(화씨 -32)/1.8
				// Double.parseDouble(스트링) 스트링을 double로 변환
				// 텍스트필드.getText() 텍스트필드.setText("값");
								
				double f =Double.parseDouble(field1.getText());
				double c=(f-32)/1.8;
				//field2.setText(Double.toString(c));
				
				//String.format("출력형식", 출력할값들)
				//%전체자리수.소수이하자리수 f
				result.setText(String.format("%7.2f",  c));
				
				
		
			}
		});
		
		
		button2.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				//섭씨를 화씨로 : (1.8 x 섭씨) + 32;
				
				double c2 =Double.parseDouble(field2.getText());
				double f2=(1.8 * c2)+32;
				
				//field
				result.setText(String.format("%7.2f", f2));
				
			}
		});
		
		
		f.setSize(300, 150);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setTitle("온도변환기");
		f.setVisible(true);
		
	}

}