windowtest2.java

java练习程序

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

//命令行运行：appletviewer c.htm


class Window153 extends Frame implements ActionListener
{
	Panel nPanel=new Panel(),sPanel=new Panel(),cPanel=new Panel();
	TextField subject=new TextField(16);
	TextField stu_number=new TextField(3);
	TextField number[]=new TextField[50];
	TextField name[]=new TextField[50];
	TextField result[]=new TextField[50];
//	Button Btn1,Btn2,Btn3,Btn4;
	Button Btn1=new Button("初始化");
	Button Btn2=new Button("统计");
	Button Btn3=new Button("取消");
	Statics other_window;
	int people_number=0;

        Window153()
        {
          	super("学生成绩统计表");
          	other_window=new Statics();
         	setBounds(100,120,550,200);
          	setVisible(true);
/*        	
//          	setLayout(new GridLayout(1,1));
          	setSize(a,b);
          	setBackground(Color.white);
*/
          	sPanel.setVisible(false);
          	cPanel.setVisible(false);

         	Label 科目=new Label("科目");
         	Label 人数=new Label("人数<50");
          	Label 学号=new Label("学号");
        	Label 姓名=new Label("姓名");
          	Label 成绩=new Label("成绩");
          	nPanel.add(科目);nPanel.add(subject);
          	nPanel.add(人数);nPanel.add(stu_number);
          	nPanel.add(Btn1);
		Btn1.addActionListener(this);
		Btn2.addActionListener(this);
		Btn3.addActionListener(this);
		
		sPanel.add(new Label("每行必须输入成绩"));
		sPanel.add(Btn2);sPanel.add(Btn3);
		
		cPanel.setLayout(new GridLayout(51,3));
	       	cPanel.add(学号);
	       	cPanel.add(姓名);
          	cPanel.add(成绩);
          	for(int i=0;i<50;i++)
          	{
          		number[i]=new TextField(" "+(i+1));
          		name[i]=new TextField("姓名");
          		result[i]=new TextField("0");
          		cPanel.add(number[i]);
          		cPanel.add(name[i]);
          		cPanel.add(result[i]);
          	}
          	ScrollPane p=new ScrollPane();
          	p.add(cPanel);
          	
          	add("North",nPanel);add("Center",p);add("South",sPanel);
          	addWindowListener(new WindowAdapter()
  	  	{
  	  		public void windowClosing(WindowEvent e)
  	  		{
  	  			setVisible(false);
  	  			System.exit(0);
  	  		}
	  	});
          	
        	pack();//紧凑方式显示窗口
        }

        public void actionPerformed(ActionEvent e)
        {
	  	if(e.getSource()==Btn1)
  		{
  			people_number=Integer.parseInt(stu_number.getText());
  			if(people_number<51)
  			{
  				cPanel.setVisible(true);sPanel.setVisible(true);
  				for(int i=0;i<people_number;i++)
  				{
  					number[i].setBackground(Color.pink);
  					name[i].setBackground(Color.cyan);
  					result[i].setBackground(Color.green);
   					number[i].setEnabled(true);
  					name[i].setEnabled(true);
  					result[i].setEnabled(true);
  				}
  				for(int i=people_number;i<50;i++)
  				{
  					number[i].setBackground(Color.white);
  					name[i].setBackground(Color.white);
  					result[i].setBackground(Color.white);
   					number[i].setEnabled(false);
  					name[i].setEnabled(false);
  					result[i].setEnabled(false);
  				}
  			}
  			else 
  			{
  				stu_number.setText("人数越界");
  			}
  		}

		else if(e.getSource()==Btn2)
		{
			other_window.setVisible(true);         //使成绩统计窗口可见
			int geshu_优=0, geshu_良=0,geshu_及格=0, geshu_不及格=0;
			double a[]=new double[50], sum=0;
			for(int i=0;i<people_number;i++)
			{
				a[i]=Double.valueOf(result[i].getText().trim()).doubleValue();
				if(a[i]>=90)  {geshu_优++;  }
				if(a[i]<90&&a[i]>=80)  {geshu_良++;}
				if(a[i]<80&&a[i]>=60)  {geshu_及格++;}
				if(a[i]<60)  {geshu_不及格++;}
				sum=sum+a[i];
			}
			sum=sum/people_number;                //平均成绩
			other_window.text[0].setText("     "+people_number);
			other_window.text[1].setText("     "+geshu_优);
			other_window.text[2].setText("     "+geshu_良);
			other_window.text[3].setText("     "+geshu_及格);
			other_window.text[4].setText("     "+geshu_不及格);
			other_window.text[5].setText("     "+sum);
		}
		else if(e.getSource()==Btn3)
		{
			for(int i=0;i<=49;i++)
			{
				number[i].setText("     "+(i+1));
				name[i].setText(null);
				result[i].setText("0");
			}
		}
	}
}

class Statics extends Frame
{
	TextField text[]=new TextField[6];
	Label 考试人数=new Label("考试人数"),
	优秀=new Label("优秀"),
	良好=new Label("良好"),
	及格=new Label("及格"),
	不及格=new Label("不及格"),
	平均=new Label("平均");
	Statics()
	{
		super("统计结果");
          	setLayout(new GridLayout(2,6));
          	add(考试人数);add(优秀);add(良好);add(及格);add(不及格);add(平均);
          	setVisible(false);
         	setBounds(140,140,200,100);
         	for(int i=0;i<6;i++)
         	{
         		text[i]=new TextField();
         		add(text[i]);
         	}
          	addWindowListener(new WindowAdapter()
  	  	{
  	  		public void windowClosing(WindowEvent e)
  	  		{
  	  			setVisible(false);
  	  			System.exit(0);
  	  		}
	  	});
	}
}

public class WindowTest2
{
	public static void main(String args[])
	{
	  Window153 win1;
		win1=new Window153();
	}
}