choiceapp.java~12~

Java灵感设计范例源代码,和大家分享一下

package choiceapp;

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
 */

public class choiceapp extends Applet {
  boolean isStandalone = false;
  Label label1 = new Label();
  XYLayout xYLayout1 = new XYLayout();
  Choice choice1 = new Choice();
  Label label2 = new Label();
  TextField textField1 = new TextField();
  Label label3 = new Label();
  TextField textField2 = new TextField();
  Label label4 = new Label();
  TextField textField3 = 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 choiceapp() {
  }
  //Initialize the applet
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception {
    label1.setText("选择图形");
    this.setLayout(xYLayout1);
    label2.setText("长度");
    textField1.setText("                     ");
    label3.setText("宽度");
    textField2.setText("  ");
    label4.setText("弧度 ");
    textField3.setText("  ");
    choice1.addItemListener(new java.awt.event.ItemListener() {
      public void itemStateChanged(ItemEvent e) {
        choice1_itemStateChanged(e);
      }
    });
    this.add(choice1,  new XYConstraints(113, 13, -1, 20));
    this.add(label2,   new XYConstraints(70, 51, 44, 17));
    this.add(textField1,   new XYConstraints(118, 53, 107, 25));
    this.add(label3,    new XYConstraints(67, 90, 45, 28));
    this.add(label4,     new XYConstraints(64, 123, 49, 23));
    this.add(textField3,   new XYConstraints(120, 123, 109, 23));
    this.add(label1,  new XYConstraints(51, 14, 59, 23));
    this.add(textField2,  new XYConstraints(119, 95, 109, -1));
 choice1.addItem("二维矩形");
    choice1.addItem("椭圆形");
    choice1.addItem("弧形");
    choice1.addItem("三维矩形");


  }
  //Get Applet information
  public String getAppletInfo() {
    return "Applet Information";
  }
  //Get parameter info
  public String[][] getParameterInfo() {
    return null;
  }

  void choice1_itemStateChanged(ItemEvent e) {
 repaint();
  }
public void  paint(Graphics g){
  String s1,s2,s3;//用于从文本框中获取字符串
  int height,width,arc;//用于存放由字符串转换为整数
  g.setColor(Color.blue );
  s1=textField1.getText();
  s2=textField2.getText();
  s3=textField3.getText();
  if(s1==null){//设置缺省值
  s1="5";
  textField1.setText(s1);}
  if(s2==null){//设置缺省值
  s2="5";
  textField2.setText(s2);}
  if(s3==null){//设置缺省值
  s3="1";
  textField3.setText(s3);}
 height=Integer.parseInt(s1);
 width=Integer.parseInt(s2);
 arc=Integer.parseInt(s3);
  switch(choice1.getSelectedIndex()){
  case 0:
 g.drawRect(80,150,height,width);
 break;
 case 1:
 g.drawOval(80,150,height,width);
 break;
 case  2:
 g.drawArc(80,150,height,width,0,arc);
 break;
 case 3:
 g.draw3DRect(80,150,height,width,true);
 break;
 default:
 g.drawString("error",80,150);
  }
  }

  }