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<split2.length;i++) {
//			System.out.println(split2[i]);   // + - * /
//		}
			
		String str[] = new String[split2.length];
			
		//格式化split2数组,
		int j = 0;
		for(int i = 0; i < split2.length; ++i) {
				
			if(split2[i].equals("."));
				
			else str[j++] = split2[i];
		}
			
		//计算结果
		double tresult = 0;
		for (int i = 0; i < split1.length; ++i) {
			if (i == 0) {
				//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

---

========================================================

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