平方根(Math.sqrtを使わない) | Codetter（こーどったー）

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/**
 * 
 */
package net.hinekure.test;
import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JFrame;
import java.awt.Dimension;
import javax.swing.JLabel;
import java.awt.Rectangle;
import javax.swing.JButton;
import javax.swing.JTextField;
/**
 * @author ****
 *
 */
public class SampleProj_20120617 extends JFrame {
    private static final long serialVersionUID = 1L;
    private JPanel jContentPane = null;
    private JLabel jLabel_1 = null;
    private JLabel jLabel_2 = null;
    private JLabel jLabel_3 = null;
    private JButton jButton_1 = null;
    private JTextField jTextField_1 = null;
    private JTextField jTextField_2 = null;
    private JTextField jTextField_3 = null;
    /**
     * This method initializes jButton_1    
     *  
     * @return javax.swing.JButton  
     */
    private JButton getJButton_1() {
        if (jButton_1 == null) {
            jButton_1 = new JButton();
            jButton_1.setBounds(new Rectangle(226, 119, 191, 90));
            jButton_1.setText("計算開始");
            jButton_1.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent e) {
                    double a = Double.parseDouble(jTextField_1.getText());
                    double epslion = Double.parseDouble(jTextField_2.getText());
                    keisan_sqrt(a, epslion);
                }
            });
        }
        return jButton_1;
    }
    /**
     * This method initializes jTextField_1 
     *  
     * @return javax.swing.JTextField   
     */
    private JTextField getJTextField_1() {
        if (jTextField_1 == null) {
            jTextField_1 = new JTextField();
            jTextField_1.setBounds(new Rectangle(14, 57, 192, 48));
        }
        return jTextField_1;
    }
    /**
     * This method initializes jTextField_2 
     *  
     * @return javax.swing.JTextField   
     */
    private JTextField getJTextField_2() {
        if (jTextField_2 == null) {
            jTextField_2 = new JTextField();
            jTextField_2.setBounds(new Rectangle(225, 59, 193, 46));
        }
        return jTextField_2;
    }
    /**
     * This method initializes jTextField_3 
     *  
     * @return javax.swing.JTextField   
     */
    private JTextField getJTextField_3() {
        if (jTextField_3 == null) {
            jTextField_3 = new JTextField();
            jTextField_3.setBounds(new Rectangle(14, 165, 188, 46));
        }
        return jTextField_3;
    }
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO 自動生成されたメソッド・スタブ
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                SampleProj_20120617 thisClass = new SampleProj_20120617();
                thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                thisClass.setVisible(true);
            }
        });
    }
    /**
     * This is the default constructor
     */
    public SampleProj_20120617() {
        super();
        initialize();
    }
    /**
     * This method initializes this
     * 
     * @return void
     */
    private void initialize() {
        this.setSize(460, 282);
        this.setContentPane(getJContentPane());
        this.setTitle("平方根の計算");
    }
    /**
     * This method initializes jContentPane
     * 
     * @return javax.swing.JPanel
     */
    private JPanel getJContentPane() {
        if (jContentPane == null) {
            jLabel_3 = new JLabel();
            jLabel_3.setBounds(new Rectangle(16, 120, 189, 27));
            jLabel_3.setText("score root of a = ");
            jLabel_2 = new JLabel();
            jLabel_2.setBounds(new Rectangle(225, 16, 195, 29));
            jLabel_2.setText("epslion = ");
            jLabel_1 = new JLabel();
            jLabel_1.setBounds(new Rectangle(15, 16, 192, 29));
            jLabel_1.setText("a = ");
            jContentPane = new JPanel();
            jContentPane.setLayout(null);
            jContentPane.add(jLabel_1, null);
            jContentPane.add(jLabel_2, null);
            jContentPane.add(jLabel_3, null);
            jContentPane.add(getJButton_1(), null);
            jContentPane.add(getJTextField_1(), null);
            jContentPane.add(getJTextField_2(), null);
            jContentPane.add(getJTextField_3(), null);
        }
        return jContentPane;
    }
    public double keisan_sqrt(double aa, double eepsilon){
        boolean flg = false;
        double x0 = aa;
        double x1 = (x0+(aa/x0))/2;
        double error = Math.abs((x1-x0)/x0);
        if (aa <= 0){
            if (aa < 0){
                flg = true;
            }else{
                jTextField_3.setText(Double.toString(aa));
            }
        }else{
            while (error >= eepsilon){
                x0 = x1;
                if (Math.abs(x0) <= 0){
                    flg = true;
                    break;
                }
                x1 = (x0+(aa/x0))/2;
                error = Math.abs((x1-x0)/0);
            }
        }
        if (flg){
            jTextField_3.setText("平方根がありません");
        }else{
            jTextField_3.setText(Double.toString(x0));
        }
        return x0;
    }
}  //  @jve:decl-index=0:visual-constraint="10,10"
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