java GUI计算器（简单实现）

2023-09-27 02:44| 来源: 网络整理| 查看: 265

java GUI计算器用到的容器类：

import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.Box;

用到的组件类

import javax.swing.JButton; import java.awt.TextField; import java.awt.event.ActionEvent; import java.awt.event.ActionListener;

布局

import java.awt.FlowLayout; import java.awt.GridLayout;

代码如下

package homework.day08.Gui; import java.awt.FlowLayout; import java.awt.GridLayout; import java.awt.TextField; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.Box; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class CounterTest1 { private String button0 = "0"; private String button1 = "1"; private String button2 = "2"; private String button3 = "3"; private String button4 = "4"; private String button5 = "5"; private String button6 = "6"; private String button7 = "7"; private String button8 = "8"; private String button9 = "9"; private String buttonAdd = "+"; private String buttonSub = "-"; private String buttonMul = "*"; private String buttonDiv = "/"; private String buttonDot = "."; private String buttonEqu = "="; private String buttonDel = "清除"; String name; private double result = 0 ; private String stringResult = ""; //设置文本框的大小为30 TextField textField = new TextField(30); public CounterTest1() { } public CounterTest1 (String name){ this.name = name; } //创建页面 public void createFrame() { JFrame jFrame = new JFrame("计算机"); jFrame.setLayout(new FlowLayout(FlowLayout.CENTER)); jFrame.setSize(500,500); //大小 jFrame.setLocation(700,300); //位置 jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭按钮 //设置按钮7,8,9，+ JPanel jPanel1 = new JPanel(new GridLayout(1,4,5,5)); jPanel1.add(ActionButtonInput(button7)); jPanel1.add(ActionButtonInput(button8)); jPanel1.add(ActionButtonInput(button9)); jPanel1.add(ActionButtonInput(buttonAdd)); //设置按钮4,5,6，- JPanel jPanel2 = new JPanel(new GridLayout(1,4,5,5)); jPanel2.add(ActionButtonInput(button4)); jPanel2.add(ActionButtonInput(button5)); jPanel2.add(ActionButtonInput(button6)); jPanel2.add(ActionButtonInput(buttonSub)); //设置按钮1,2,3，* JPanel jPanel3 = new JPanel(new GridLayout(1,4,5,5)); jPanel3.add(ActionButtonInput(button1)); jPanel3.add(ActionButtonInput(button2)); jPanel3.add(ActionButtonInput(button3)); jPanel3.add(ActionButtonInput(buttonMul)); //设置按钮清除，0，/ = JPanel jPanel4 = new JPanel(new GridLayout(1,4,5,5)); jPanel4.add(ActionButtonInput(buttonDot)); jPanel4.add(ActionButtonInput(button0)); jPanel4.add(ActionButtonInput(buttonDiv)); // 设置等于按钮 jPanel4.add(ActionButtonEqu(buttonEqu)); //设置删除按钮为一行一列，5个像素点 JPanel jPanel5 = new JPanel(new GridLayout(1,1,5,5)); jPanel5.add(DelButton(buttonDel)); // 创建横向Box布局 Box box = Box.createVerticalBox(); //从上到下，将组件添加到box容器中 box.add(textField); box.add(jPanel1); box.add(jPanel2); box.add(jPanel3); box.add(jPanel4); box.add(jPanel5); //将box布局添加到Frame容器中 jFrame.setContentPane(box); //窗口显示出来 jFrame.setVisible(true); } //对于button 的操作 public JButton ActionButtonInput(String buttonName) { JButton button = new JButton(buttonName); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { stringResult =stringResult + buttonName; //将输入的计算数字在文本框中显示 textField.setText(stringResult); //将输入的计算数字在控制台显示 System.out.println(stringResult); } }); return button; } //设置等于按钮 public JButton ActionButtonEqu(String buttonName) { JButton button = new JButton(buttonName); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { calculate(); //将结果显示在文本框 textField.setText("运算结果是："+Double.toString(result)); System.out.println("运算结果是："+result); } }); return button; } //计算输入的字符串 public double calculate() { //得到输入字符串的数字和操作符 //转义字符相当于+，-，*，/ String regex0 = "(\\+)|(\\-)|(\\*)|(\\/)"; //该语句定义一个正则表达式 String regex1 = "[0-9]+|[0-9]+\\.[0-9]"; //将输入的字符串按运算符（+，-, * , / ）分割出来，剩下数字 String split1[] = stringResult.split(regex0); // for (int i = 0; i < array.length; i++) { // System.out.print(split1[i]+" "); // } //将运算符分割出来 String split2[] = stringResult.split(regex1); // for(int i=0;i if(split2[i].equals(".")); else str[j++] = split2[i]; } //计算结果 double tresult = 0; for (int i = 0; i //表示将从数组中得到的值转换成Double类型的数据 tresult = Double.parseDouble(split1[i]); }else { //判断进行什么操作 if (str[i].equals("+")) tresult += Double.parseDouble(split1[i]); else if (str[i].equals("-")) tresult -= Double.parseDouble(split1[i]); else if (str[i].equals("*")) tresult *= Double.parseDouble(split1[i]); else if (str[i].equals("/")) tresult /= Double.parseDouble(split1[i]); else continue; } } this.result = tresult; return result; } //设置清除按钮监听器 public JButton DelButton(String buttonName) { JButton button = new JButton(buttonName); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { //将结果和文本框内容清除 result = 0; stringResult = ""; textField.setText(stringResult); } }); return button; } public static void main(String[] args) { CounterTest1 test = new CounterTest1(); test.createFrame(); } } 运行截图

在这里插入图片描述

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这是一个只能求加法的计算器

代码如下

package GUI; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; public class MyFirstGUI extends JFrame{ private static final long serialVersionUID = 1L; private JButton button; private JPanel jPanel; private JLabel addLabel,eqsLabel; private JTextField f1,f2,f3; public MyFirstGUI() { setTitle("MY-GUI"); //设置位置和宽高 setBounds(40, 40, 400, 400); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); initComponent(); setVisible(true); } private void initComponent(){ //初始化组件 jPanel = new JPanel(); button = new JButton("求和"); addLabel = new JLabel("+"); eqsLabel = new JLabel("="); //创建文本输入框对象,并设置长度为5 f1 = new JTextField(5); f2 = new JTextField(5); f3 = new JTextField(5); //设置容器的布局管理器并添加组件 jPanel.setLayout(new FlowLayout()); jPanel.add(f1); jPanel.add(addLabel); jPanel.add(f2); jPanel.add(eqsLabel); jPanel.add(f3); jPanel.add(button); this.add(jPanel); //给指定的组件添加事件监听 button.addActionListener(new ActionListener(){ //当鼠标点击这个指定按钮的时候程序就会调用这个方法 @Override public void actionPerformed(ActionEvent e) { //拿到第一个输入框中的数组(String转换为Double) double a =Double.parseDouble(f1.getText()); //拿到第二个输入框中的数组(String转换为Double) double b = Double.parseDouble(f2.getText()); //相加得到结果 double c = a+b; //把结果放到第三个输入框中 f3.setText(c+""); } }); } public static void main(String[] args) { new MyFirstGUI(); } }

运行截图在这里插入图片描述

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