// Newton法による方程式の実数解

/* <applet code="Ex060921f" width=300 height=150> </applet> */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Ex060921f extends JApplet implements ActionListener{
	JButton bt1;
	JTextField tf1,tf2;
  Ex060921f_newton nmt; 
	
	public void init(){
		nmt = new Ex060921f_newton();
		JPanel pl = new JPanel();
		Container cp = getContentPane();
		pl.setLayout(null);
		JLabel lb = new JLabel("Newton法による方程式の数値解");
		lb.setBounds(5,5,285,20);
		JLabel lb1 = new JLabel("初期値 x=");
		lb1.setBounds(5,30,60,25);
		JLabel lb2 = new JLabel("実数解 x=");
		lb2.setBounds(5,65,60,25);
		pl.add(lb);
		pl.add(lb1);
		pl.add(lb2);
    tf1 = new JTextField(80);
    tf2 = new JTextField(80);
	 	tf1.setBounds(65,30,220,25);
	 	tf2.setBounds(65,65,220,25);
		pl.add(tf1);
		pl.add(tf2);
		bt1 = new JButton("計　算");
	 	bt1.setBounds(70,120,80,25);
	 	bt1.setVisible(true);
		bt1.addActionListener(this);
		pl.add(bt1);
		cp.add(pl);
	}
	
  public void actionPerformed(ActionEvent event){
	 	bt1.setVisible(true);
    if(event.getSource()==bt1){
  		if(tf1.getText()!=""){ //不具合あり
  			nmt.initialval = Double.valueOf(tf1.getText()).doubleValue();
  			tf2.setText(""+nmt.ans());
  		}	
  	}
  }	
}