试验十

Posted 2021-12-18 yanqianying1

package jisuanqi;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;

class counter1 extends JFrame 

public counter1()

super("计算器");
this.setSize(400,100);
this.setLocation(300,240);
this.setLayout(new FlowLayout());
TextField text1=new TextField(4);
text1.setText("1");
this.add(text1);

String proList[] = "+","-","x" ,"%";
TextField text;
JComboBox comboBox;
Container conPane = getContentPane();
comboBox = new JComboBox(proList);
comboBox.setEditable(true);
conPane.add(comboBox);

TextField text2=new TextField(4);
text2.setText("1");
this.add(text2);
JButton button = new JButton("=");
this.add(button);
TextField text3=new TextField(4);
text3.setText("2");

button.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
 
String s=comboBox.getEditor().getItem().toString();
double a= Integer.parseInt(text1.getText());
double b= Integer.parseInt(text2.getText());
if(s.equals("+"))
double t=a+b;
String m=String.valueOf(t);

text3.setText(m);

else if(s.equals("-"))
double t=a-b;
String m=String.valueOf(t);

text3.setText(m);
else if(s.equals("x"))
double t=a*b;
String m=String.valueOf(t);

text3.setText(m);
else
double t=a/b;
String m=String.valueOf(t);

text3.setText(m);

);
conPane.add(text3);
this.setVisible(true);

 

public class Counter
public static void main(String[] args)

new counter1();