sy7_6.java

根据上课老师的要求

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
 class Mycomput extends Frame implements  ActionListener,ItemListener
{  TextField text1,text2,text3;
	Label lab1,lab2,lab3;
	Button ad,sub,milt,div,but;
	public Mycomput()
	{
		super("简单计算器");
		setSize(300,200);
	}
	public void init()
	{
		GridBagLayout gbl=new GridBagLayout();
		
        GridBagConstraints gbc=new GridBagConstraints();
		setLayout(gbl);
		lab1=new Label("操作数:");
		text1=new TextField(10);
		text1.addActionListener(this);
		System.out.println();
		lab2=new Label("操作数:");
		text2=new TextField(10);
		text2.addActionListener(this);
		lab3=new Label("结果:");
		text3=new TextField(10);
		text3.addActionListener(this);
		ad=new Button("加");
		sub=new Button("减");
		milt=new Button("乘");
		div=new Button("除");
		but=new Button("退出");
		ad.addActionListener(this);
		sub.addActionListener(this);
		milt.addActionListener(this);
		div.addActionListener(this);
		but.addActionListener(this);

		gbc.gridx=0;gbc.gridy=2;
		gbc.gridwidth =1;
		gbc.gridheight=1;
		gbc.fill=GridBagConstraints.SOUTHWEST;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,1,5);
		gbl.setConstraints(lab1,gbc);
		add(lab1);

		gbc.gridx=1;gbc.gridy=2;
		gbc.gridwidth =1;
		gbc.gridheight=1;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,1,5);
		gbl.setConstraints(text1,gbc);
		add(text1);

		gbc.gridx=0;gbc.gridy=3;
		gbc.gridwidth =1;
		gbc.gridheight=1;
		gbc.fill=GridBagConstraints.SOUTHWEST;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,2,5);
		gbl.setConstraints(lab2,gbc);
		add(lab2);

      gbc.gridx=1;gbc.gridy=3;
		gbc.gridwidth =1;
		gbc.gridheight=1;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,2,5);
		gbl.setConstraints(text2,gbc);
		add(text2);

		gbc.gridx=0;gbc.gridy=4;
		gbc.gridwidth =1;
		gbc.gridheight=1;
		gbc.fill=GridBagConstraints.SOUTHWEST;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,3,5);
		gbl.setConstraints(lab3,gbc);
		add(lab3);

      gbc.gridx=1;gbc.gridy=4;
		gbc.gridwidth =1;
		gbc.gridheight=1;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,3,5);
		gbl.setConstraints(text3,gbc);
		add(text3);

       gbc.gridx=3;gbc.gridy=2;
		gbc.gridwidth =2;
		gbc.gridheight=1;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,2,5);
		gbl.setConstraints(ad,gbc);
		add(ad);

		gbc.gridx=3;gbc.gridy=3;
		gbc.gridwidth =2;
		gbc.gridheight=1;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,3,5);
		gbl.setConstraints(sub,gbc);
		add(sub);

		gbc.gridx=3;gbc.gridy=4;
		gbc.gridwidth =2;
		gbc.gridheight=1;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,4,5);
		gbl.setConstraints(milt,gbc);
		add(milt);

		gbc.gridx=3;gbc.gridy=5;
		gbc.gridwidth =2;
		gbc.gridheight=1;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,5,5);
		gbl.setConstraints(div,gbc);
		add(div);

		gbc.gridx=1;gbc.gridy=6;
		gbc.gridwidth =2;
		gbc.gridheight=1;
		gbc.weightx=1;gbc.weighty=0;
		gbc.insets=new Insets(2,5,6,5);
		gbl.setConstraints(but,gbc);
		add(but);
	}
	public void itemStateChanged(ItemEvent e)
	{
	}
	public void actionPerformed(ActionEvent e)
	{    double d;
	int align=FlowLayout.LEFT;
         if(e.getSource()==ad)
		{    align=FlowLayout.LEFT;
			 double i,j;
			 i=Double.valueOf(text1.getText()).doubleValue();
			 j=Double.valueOf(text2.getText()).doubleValue();
			 d=i+j;
			 text3.setText(String.valueOf(d));
             }
    if(e.getSource()==sub)
		{ align=FlowLayout.CENTER;
			 double i,j;
			 i=Double.valueOf(text1.getText()).doubleValue();
			 j=Double.valueOf(text2.getText()).doubleValue();
			 d=i-j;
			 text3.setText(String.valueOf(d));
      }
 if(e.getSource()==milt)
		{align=FlowLayout.RIGHT;
			 double i,j;
			 i=Double.valueOf(text1.getText()).doubleValue();
			 j=Double.valueOf(text2.getText()).doubleValue();
			 d=i*j;
			 text3.setText(String.valueOf(d));
      }
	  if(e.getSource()==div)
		{
			 double i,j;
			 i=Double.valueOf(text1.getText()).doubleValue();
			 j=Double.valueOf(text2.getText()).doubleValue();
			 d=i/j;
			 text3.setText(String.valueOf(d));
      }

        if(e.getSource()==but)
		{
			System.exit(0);
		}
	}

}
class koWindowListener extends WindowAdapter
{public void windowClosing(WindowEvent e)
 {e.getWindow().dispose();
  System.exit(0);
  }}
public class Sy7_6

{
	public  static   void   main(String[]   args)
	{
		Mycomput comput=new Mycomput();
		comput.init();
		comput.setVisible(true);

	}
}