求给定整数的平方根代码,Java代码库,德仔网

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【Java】求给定整数的平方根

作者:Dezai.CN / 发布于2011/1/25/ 784

import java.awt.event.*;
import java.awt.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
class Dwindow extends JFrame implements ActionListener {
JTextField inputNumber;
JTextArea show;
Dwindow(String s) {
super(s);
inputNumber = new JTextField(22);
inputNumber.addActionListener(this);
show = new JTextArea();
add(inputNumber, BorderLayout.NORTH);
JScrollPane sp = new JScrollPane();
sp.setViewportView(show);
add(sp, BorderLayout.CENTER);
setBounds(60, 60, 300, 300);
setVisible(true);
validate();
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e) {
boolean boo = false;
if (e.getSource() == inputNumber) {
String s = inputNumber.getText();
char a[] = s.toCharArray();
for (int i = 0; i < a.length; i++) {
if (!(Character.isDigit(a[i])))
boo = true;
}
if (boo == true) // 弹出&ldquo;警告&rdquo;消息对话框
{
JOptionPane.showMessageDialog(this, "您输入了非法字符", "警告对话框",
JOptionPane.WARNING_MESSAGE);
inputNumber.setText(null);
} else if (boo == false) {
int number = Integer.parseInt(s);
show.append("\n" + number + "平方根:" + Math.sqrt(number));
}
}
}
}
public class Ex01 {
public static void main(String args[]) {
new Dwindow("带对话框的窗口，求给定整数的平方根");
}
}
<div>
</div>

试试其它关键字

　平方根　

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