chapter4.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,
 *2004,11,8
 */
 import java.awt.*;
 import java.awt.event.*;
 public class chapter4 extends Frame implements ActionListener,ItemListener{
 	static chapter4 frm=new chapter4();
 	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("SelfAdopt1 calculate((sinx)/x)'s integral");
 		ch.add("SelfAdopt2 calculate(sin(x)*sin(x)+1)'s integral");
   		ch.addItemListener(frm);
  		frm.setTitle("第4章");
  		l=new Label("current acerage 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(800,500);
 		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();
			tf.setText("");
		}
 		public void itemStateChanged(ItemEvent e){
 			int index=ch.getSelectedIndex();
 			call4 cal=new call4();
 			cal.act(index,g,tf);
 		}
 }
 
 class call4{
  	void act(int choice,Graphics g,TextField tf){
 		switch(choice){
 			case 0:integral1 integrate=new integral1(); integrate.calculate(g,tf);break;
 			case 1:subsectionIntegral1 subI=new subsectionIntegral1(); subI.calculate(g,tf); break;
 		} 		
 	}
  }