java界面-加减-下拉列表文本框按钮

来源：互联网发布：2017数据新闻比赛编辑：程序博客网时间：2024/06/11 06:43

import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JFrame;public class BaseFrame extends JFrame{public BaseFrame (String title){setLayout(null);setTitle(title);setSize(800,300);this.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});//关闭窗口的匿名类setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);}public void showMe(){setVisible(true);}}

import java.awt.GridLayout;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.*;public class Calc {public static void main(String[] args) {JPanel j=new JPanel();BaseFrame f=new BaseFrame("hello");j.setSize(800,50);j.setLayout(new GridLayout(1,5));JTextField t1=new JTextField();JTextField t2=new JTextField();JTextField t3=new JTextField();JComboBox cb=new JComboBox();cb.addItem("+");cb.addItem("-");cb.addItem("*");cb.addItem("/");JButton btn =new JButton("按钮");j.add(t1);j.add(cb);j.add(t2);j.add(btn);j.add(t3);j.setVisible(true);f.add(j);f.showMe();}}

效果图

只有界面无法实现实际功能-----下一步实现实际功能敬请期待

实现加法

import java.awt.GridLayout;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.*;public class Calc {public static void main(String[] args) {JPanel j=new JPanel();BaseFrame f=new BaseFrame("hello");j.setSize(800,50);j.setLayout(new GridLayout(1,5));JTextField t1=new JTextField();JTextField t2=new JTextField();JTextField t3=new JTextField();JComboBox cb=new JComboBox();cb.addItem("+");cb.addItem("-");cb.addItem("*");cb.addItem("/");JButton btn =new JButton("按钮");j.add(t1);j.add(cb);j.add(t2);j.add(btn);j.add(t3);j.setVisible(true);f.add(j);f.showMe();String s=(String)cb.getSelectedItem();    btn.addActionListener(new ActionListener() {    public void actionPerformed(ActionEvent e) {if(s.equals("+")){int c=0;   int num1 = Integer.parseInt(t1.getText());int num2 = Integer.parseInt(t2.getText());c=num1+num2;String s1=Integer.toString(c);t3.setText(s1);    }}});}}

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