swing小计算器2.0

 

把上一次写的计算器代码缩减到了110行，大概缩短了1/3，不过代码还是可以缩减

下面开始学习网络编程了，有时间再继续写个科学计算器出来

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CalculatorFrame extends JFrame {
	JTextField jtf = new JTextField();
	JPanel panel = new JPanel();
	int select = 0;
	String command = "";
	double temp = 0.0;
	double number;
	public CalculatorFrame(){
		this.setTitle("计算器2.0版");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		//Frame窗口可以关闭(默认也为关闭)
		Container con = getContentPane();
		con.add(jtf,BorderLayout.NORTH);
		con.add(panel,BorderLayout.CENTER);
		panel.setLayout(new GridLayout(4,4));
		con.add(panel);
		jtf.setHorizontalAlignment(JTextField.RIGHT);//文本靠右排放	
		ActionListener nums = new CaculatorAction1();
		ActionListener opin = new CaculatorAction2();	
		addButton("1",nums);
		addButton("2",nums);
		addButton("3",nums);
		addButton("+",opin);
		addButton("4",nums);
		addButton("5",nums);
		addButton("6",nums);
		addButton("-",opin);
		addButton("7",nums);
		addButton("8",nums);
		addButton("9",nums);
		addButton("*",opin);
		addButton("0",nums);
		addButton(".",opin);
		addButton("=",opin);
		addButton("/",opin);
	}
	private void addButton(String str, ActionListener list){
		JButton button = new JButton(str);
		button.addActionListener(list);
		panel.add(button);
	}
	class CaculatorAction1 implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			String input = e.getActionCommand();
			jtf.setText(jtf.getText()+input);
		}
	}
	class CaculatorAction2 implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			String command = e.getActionCommand();
			if(command.equals("+")){
				temp = Double.parseDouble(jtf.getText());
				jtf.setText("");
				select = 1;
			}
			if(command.equals("-")){
				temp = Double.parseDouble(jtf.getText());
				jtf.setText("");
				select = 2;
			}
			if(command.equals("*")){	
				temp = Double.parseDouble(jtf.getText());
				jtf.setText("");
				select = 3;
			}
			if(command.equals("/")){
				temp = Double.parseDouble(jtf.getText());
				jtf.setText("");
				select = 4;
			}
			if(command.equals("=")){
				if(select == 1){
					number = Double.parseDouble(jtf.getText());
					jtf.setText((number = temp + number)+"");
				}
				else if(select == 2){
					number = Double.parseDouble(jtf.getText());
					jtf.setText((number = temp - number)+"");
				}
				else if(select == 3){
					number = Double.parseDouble(jtf.getText());
					jtf.setText((number = temp * number)+"");
				}
				else if(select == 4){
					number = Double.parseDouble(jtf.getText());
					if(number == 0){
						JOptionPane.showMessageDialog(panel, "除数不能为0");
					}
					else{
						jtf.setText((number = temp/number)+"");
					}
				}
			}
		}
	}
}
public class Calculatortest {
	public static void main(String[] args) {
		CalculatorFrame mainFrame = new CalculatorFrame();
		mainFrame.setSize(400,400);
		mainFrame.setTitle("calculator");
		mainFrame.setVisible(true);
	}
}