实验十：图形用户界面设计

Posted 2021-12-17 lht-548

源代码：

package jisuanqi;

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.StringTokenizer;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class jisuanqi extends JFrame implements ActionListener
private JButton yunsuan;
private JTextField text;
public jisuanqi()
super("运算器");
this.setSize(400,100);
this.setLocation(300,240);
this.setLayout(new FlowLayout());
this.add(new JTextField("10",8));//区域为8

this.add(new Label("+"));
this.add(new JTextField("20",8));
this.yunsuan=new JButton("=");
this.add(this.yunsuan);
this.add(new JTextField(10));
this.text=new JTextField(8);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭窗口


public void actionPerformed(ActionEvent e) //判断运算符来进行预算
text.setText(text.getText()+yunsuan.getText());
if(text.getText().contains("+"))//做加法运算
StringTokenizer st1 = new StringTokenizer(text.getText(),"+");
double d1,d2 = 0;
d1 = Double.parseDouble(st1.nextToken());
while(st1.hasMoreTokens())
StringTokenizer st2 = new StringTokenizer(st1.nextToken(),"=");
d2 = Double.parseDouble(st2.nextToken());

text.setText(yunsuan.getText()+" "+(d1+d2));


public void Text(JButton button)
button.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent arg0)
String str = button.getText();
text.setText(text.getText()+str);

);

public static void main(String[] args)
new jisuanqi();

 

结果界面为：

心得：只要掌握了那些方法的原理，就可以做出来