计算器

标签：计算机

package cn.hncu.gaming;

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class CopyOfMyReferenceGame extends JFrame implements ActionListener {
	JButton[] btns;
	JTextField tfd;
	String str = "",bite = "+";//bite默认符号位为加法运算
	Double sum = 0.0;
	Color color = Color.green;
	
	public CopyOfMyReferenceGame(){
		super("计算机");
		setBounds(400, 240, 260, 260);
		
		{//在北面加一个文本行
			JPanel pan1 = new JPanel();
			getContentPane().add(pan1,"North");
			pan1.setLayout(new FlowLayout(FlowLayout.RIGHT));
			tfd = new JTextField("0",20);
			tfd.setHorizontalAlignment(JTextField.RIGHT);
			tfd.setEditable(true);
			pan1.add(tfd);
		}
		
		{//加计算机按钮
			MyCalculator();
		}
		
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
	}
	
	private void MyCalculator() {//加四个功能+ - * /
		JPanel calculatorPanel = new JPanel();
		getContentPane().add(calculatorPanel);
		{//加按钮
			JPanel pan2 = new JPanel();
			getContentPane().add(pan2);
			pan2.setLayout(new GridLayout(5,4));
			String[] calculatorLabel = {	"color"," "," ","C",
											"7","8","9","+",
											"4","5","6","*",
											"1","2","3","/",
											"-","0",".","="
					};
			btns = new JButton[21];//用1-16号，0号暂时不用，可做颜色按钮。
			for (int i = 1; i < btns.length; i++) {
				btns[i] = new JButton(calculatorLabel[i-1]);
				pan2.add(btns[i]);
				btns[i].addActionListener(this);
			}
		}
		
	}

	public static void main(String[] args) {
		new CopyOfMyReferenceGame();
	}
	
	@Override
	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand().equals("+")){
			calculate("+");
			tfd.setText(str = "");
			bite = "+";
		}else if(e.getActionCommand().equals("-")){
			calculate("-");
			tfd.setText(str = "");
			bite = "-";
		}else if(e.getActionCommand().equals("*")){
			calculate("*");
			tfd.setText(str = "");
			bite = "*";
		}else if(e.getActionCommand().equals("/")){
			calculate("/");
			tfd.setText(str = "");
			bite = "/";
		}else if(e.getActionCommand().equals("=")){
			calculate("=");
			tfd.setText(str = ""+sum);
			sum = 0.0;
			bite = "+";
		}else if(e.getActionCommand().equals(".")){
			str += ".";
			tfd.setText(str);
		}else if(e.getActionCommand().equals("C")){
			sum = 0.0;
			tfd.setText(str = "");
			bite = "+";
		}else if(e.getActionCommand().equals(" ")){
			
		}else if(e.getActionCommand().equals("color")){
			color = JColorChooser.showDialog(this, "颜色选择", Color.green);
			for (int i = 1; i < btns.length; i++) {
				btns[i].setForeground(color);
			}
		}else{
			str += e.getActionCommand();
			tfd.setText(str);
			if(str.length()>5){
				JOptionPane.showMessageDialog(this, "输入位数大于5，请重新输入！！！");
				tfd.setText(str = "");
			}
		}
	}
	private void calculate(String string){//给个计算命令
		if(string.equals("=")){
			if(bite.equals("+")){
				sum += Double.parseDouble(str);
			}else if(bite.equals("-")){
				sum -= Double.parseDouble(str);
			}else if(bite.equals("*")){
				sum *= Double.parseDouble(str);
			}else if(bite.equals("/")){
				sum /= Double.parseDouble(str);
			}
		}else{
			sum = Double.parseDouble(str);
		}
	}
}

计算器

标签：计算机

原文地址：http://blog.csdn.net/hncu1306602liuqiang/article/details/46390265