datatrans.java

方面

package datatrans;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import com.borland.jbcl.layout.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */

public class datatrans extends Applet {
  boolean isStandalone = false;
  XYLayout xYLayout1 = new XYLayout();
  Label label1 = new Label();
  Button button1 = new Button();
  TextField textField2 = new TextField();
  TextField textField1 = new TextField();
  //Get a parameter value
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  //Construct the applet
  public datatrans() {
  }
  //Initialize the applet
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception {
    label1.setText("计算sin（）x=");
    this.setLayout(xYLayout1);
    button1.setLabel("开始计算");
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    textField2.setEditable(false);
    this.add(button1,  new XYConstraints(86, 54, 145, 33));
    this.add(textField2,  new XYConstraints(90, 110, 188, 31));
    this.add(label1, new XYConstraints(41, 21, -1, -1));
    this.add(textField1,   new XYConstraints(139, 15, 144, 27));
  }
  //Get Applet information
  public String getAppletInfo() {
    return "Applet Information";
  }
  //Get parameter info
  public String[][] getParameterInfo() {
    return null;
  }

  void button1_actionPerformed(ActionEvent e) {
 String s;   //获取textField1中的内容，将其定义为字符类型
     double x;  //将上面获得的字符转换为数字类型
     double y;   //定义为计算结果
s=textField1.getText();
      x=Double.parseDouble(s);
  y=Math.sin(x);
textField2.setText("运行结果为："+String.valueOf(y));

  }
}