chapter3.java

数值算法例子,牛顿插值,拉格朗日,三次样条

/*@author 邱宇峰 ,software project031,
 *2004,10,8
 */

 import java.awt.*;
 import java.awt.event.*;

 public class chapter3 extends Frame implements ActionListener,ItemListener{
 	static chapter3 frm=new chapter3();
 	static Graphics g;
 	static Panel pl;
	static Button b;
	static Label l;
	static TextField tf;
 	static Choice ch=new Choice();
 	public static void main(String[] args){
 		ch.add("GoldenSearch calculate(cosX)function's max value");
 		ch.add("HalfSearch   calculate(X=2sinX)function's all value");
  		ch.add("MaxSpeedSearch calculate(/(x*x+y*y+2))function's max value");
   		ch.addItemListener(frm);
  		frm.setTitle("第3章");
  		l=new Label("current height is");
  		tf=new TextField(15);
  		pl=new Panel();
  		pl.setLayout(new FlowLayout());
  		b=new Button("clean");
   		b.addActionListener(frm);
		pl.setLayout(new FlowLayout());
		pl.add(b); pl.add(l); pl.add(tf);
    	frm.add(ch,"North");
    	frm.add(pl,"South");
 		frm.setSize(700,700);
 		frm.setVisible(true);
 		frm.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}
		});
		g=frm.getGraphics();
 	}
		public void actionPerformed(ActionEvent e){
			Graphics g=getGraphics();
			repaint();
		}
 		public void itemStateChanged(ItemEvent e){
 			int index=ch.getSelectedIndex();
 			call3 cal=new call3();
 			cal.act(index,g,tf);
 		}
 }
 
 class call3{
  	void act(int choice,Graphics g,TextField tf){
 		switch(choice){
 			case 0:goldenSearch1 gS=new goldenSearch1(); gS.search(g);break;
 			case 1:halfSearch1 hS=new halfSearch1();     hS.search(g); break;
 			case 2:maxSpeedAscending1 mSA=new maxSpeedAscending1();mSA.ascending(g,tf);break;
 		} 		
 	}
  }