testif.java

还不错的java基本实例

package ch4;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Testif  extends JFrame{
    private JTextField textBox1;
    private JButton btnOk;
    private JButton btnAgain;
    
    private int pass=0;
    private int student;
    private int  result;
    private float p;
    private String str="提高学费";

    public Testif() {
        createComponents();
        layoutComponents();
        registerEventHandlers();
        setTitle("考试结果分析");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
    }

     private void createComponents() {
     	    textBox1 = new JTextField(10);
            btnOk = new JButton("确定");
            btnAgain = new JButton("重新输入");
     }

     private void layoutComponents() {
        Container c=this.getContentPane();
        c.setLayout(new GridLayout(2, 1));

        JPanel pane1 = new JPanel(new FlowLayout());
        pane1.add( btnOk);
        pane1.add( btnAgain);

        JPanel pane2 = new JPanel(new FlowLayout());
        pane2.add(textBox1);

        c.add(pane2);
        c.add( pane1);
    }
     
     private void registerEventHandlers() {
        btnOkActionEventHander hander1=new btnOkActionEventHander();
        btnOk.addActionListener(hander1);
       
        btnAgainActionEventHander hander2=new btnAgainActionEventHander();
        btnAgain.addActionListener(hander2);
   }
   
     private class btnOkActionEventHander implements ActionListener{
        public void actionPerformed(ActionEvent e) {
        	result=Integer.parseInt(textBox1.getText());
			student=student+1;
			textBox1.setText("");
			if(result==1)
				pass+=1;
			if (student>=10)
			{
				textBox1.setEnabled(false);
                p=100*(float)(pass)/(float)student;
				if(p<80)
					str="降低学费";
				JOptionPane.showMessageDialog( null,
						"学生人数为:"+student+"\n"+"通过率为:"+p+"%\n"+str,
		                "结果",+JOptionPane.INFORMATION_MESSAGE);
			 }
        }
    }

     private class btnAgainActionEventHander implements ActionListener{
        public void actionPerformed(ActionEvent e) {
        	pass=0;
			 student=0;
		     result=0;
			 p=0;
			textBox1.setEnabled(true);
        }
    }

    public static void main(String[] args) {
        JFrame.setDefaultLookAndFeelDecorated(true);
        Testif frame=new Testif();
        frame.setVisible(true);
       }
    
}