38.txt

是一个 java 基础学习软件 有设计说明

/**        GUI设计
知识点：
2	基于AWT的GUI设计
2	AWT组件及布局管理器使用

目标/功能要求：
	定义一个基于控制台的Java应用程序，实现标准/科学计算器的图形界面，可参考Win2000附件中的计算器界面，例如：
说明：
1.	开发可视化的图形用户界面，使用java.awt包中的下述组件类：Frame, Panel, MenuBar, Menu, MenuItem, 
TextField, Button等，也可以根据需要使用其它的组件或自己定制的组件类型。
2.	计算器的图形用户界面至少应包括下述两个组成部分：显示器、按
键。显示器用于显示用户键入的操作数、中间结果和最终结果；按键包括数字键、运算符号键和其它辅助功能键，用于输入数据和运算指令；下图是一个参考界面，也可参照Win98或Win2000附件中的计算机进行外观设计：
*///
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.awt.geom.*;
import java.util.*;

public class GuiTest 
{
  public static void main(String[] args)
   {
      UserFrame frame = new UserFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         //	close window
      
      GuiMenuBar menuBar = new GuiMenuBar();						//	create  menu	
      frame.setJMenuBar(menuBar);
      
 	  frame.setLocation(200,250);      								//	show frame
	  frame.addWindowListener(new
	  		WindowAdapter()
	  		{
				public void windowClosing(WindowEvent e)
				{
					System.exit(0);
				}
			});
	  frame.setVisible(true);
	  
	}
} 
class GuiMenuBar extends JMenuBar       //   define  menu
{
	public GuiMenuBar()
	{
	  JMenu File= new JMenu ("File");				//file menu
	  JMenuItem Exit = new JMenuItem ("Exit");
	  Exit.addActionListener(new
		AbstractAction("Exit")
		{
				public void actionPerformed(ActionEvent event)
				{
					System.exit(0);
				}
			});      			 
	  File.add(Exit);
	  this.add(File);  
	  
	  JMenu Help= new JMenu ("Help");     			// help menu
	  JMenuItem About = new JMenuItem ("About");
	  Help.add(About);
	  About.addActionListener(new
	  	ActionListener()
	  	{
	  		public void actionPerformed(ActionEvent event)
			{
				JOptionPane.showMessageDialog(null,"科学计算器 1.0版本","关于计算器",JOptionPane.INFORMATION_MESSAGE,null);
		  	}
	  	});
	  this.add(Help); 	  
	}
}							
 class UserFrame extends JFrame	   //  define Frame
{
   Container contentPane;
   final JTextField showTextField;
   private JButton Space;
   
   public UserFrame()             //	initialize
   {
      this.setSize(WIDTH, HEIGHT);
      this.setTitle("  科学计算器  1.0 版");
      this.setResizable(false);
      this.setIconImage(Toolkit.getDefaultToolkit().getImage("about.gif"));
  	  this.setCursor(new Cursor(Cursor.HAND_CURSOR));
   	  this.sign = false;
   	  this.str = "";
   	  this.str1 = "";
   	  this.n = 0;
   	  this.m = 0;
   	  this.k = 0;
    	
   	  JPanel panel = new JPanel();					//  create  panel
   	  showTextField  = new JTextField("0",27);			//	set textfield
	  panel.add(showTextField);	
	  
	  PressAction action = new PressAction();       //  create  actionListener
// line 1 . set  button
	  Space = new JButton("  ");
	  panel.add(Space);

	  JButton backSpace = new JButton("  Backspace  ");
	  backSpace.setForeground(Color.red);
	//  backSpace.setFont(new Font("宋体",Font.ITALIC,14));
      backSpace.addActionListener(action);
	  panel.add(backSpace);
	  
	  JButton buttonCE = new JButton("  CE ");
	  buttonCE.setForeground(Color.red);
      buttonCE.addActionListener(action);
	  panel.add(buttonCE);	  
	  
	  JButton buttonC = new JButton("  C  ");
	  buttonC.setForeground(Color.red);
	  buttonC.addActionListener(action);
	  panel.add(buttonC);	  
//line 2 .	  
	  JButton buttonMC = new JButton("MC");
	  buttonMC.setForeground(Color.red);
      buttonMC.addActionListener(action);
	  panel.add(buttonMC);	  
	  
	  JButton button7 = new JButton("7");
	  button7.addActionListener(action);	  
	  panel.add(button7);	 	 
	  
	  JButton button8 = new JButton("8");
	  button8.addActionListener(action);	  
	  panel.add(button8);	 	
	  
	  JButton button9 = new JButton("9");
	  button9.addActionListener(action);	  	  
	  panel.add(button9);	 
	  
	  JButton buttonDev = new JButton("/");
	  buttonDev.setForeground(Color.red);
	  buttonDev.addActionListener(action);	  	  
	  panel.add(buttonDev);
	  
	  JButton buttonSqrt = new JButton("sqrt");
      buttonSqrt.addActionListener(action);
	  panel.add(buttonSqrt);
//line 3 .
	  JButton buttonMR= new JButton("MR");
	  buttonMR.setForeground(Color.red);
      buttonMR.addActionListener(action);
	  panel.add(buttonMR);	  
	  
	  JButton button4 = new JButton("4");
	  button4.addActionListener(action);	  	  
	  panel.add(button4);
	  	 	 
	  JButton button5 = new JButton("5");
	  button5.addActionListener(action);	  	  
	  panel.add(button5);	 	
	  
	  JButton button6 = new JButton("6");
	  button6.addActionListener(action);	  	  
	  panel.add(button6);	 
	  
	  JButton buttonMul = new JButton("*");
	  buttonMul.setForeground(Color.red);
	  buttonMul.addActionListener(action);	
	  panel.add(buttonMul);
	  
	  JButton buttonPer = new JButton(" % ");
      buttonPer.addActionListener(action);	  
	  panel.add(buttonPer);	  
//line 4 .
	  JButton buttonMS= new JButton("MS");
	  buttonMS.setForeground(Color.red);	  
      buttonMS.addActionListener(action);	  
	  panel.add(buttonMS);	  
	  
	  JButton button1 = new JButton("1");
	  button1.addActionListener(action);  
	  panel.add(button1);	 
	  	 
	  JButton button2 = new JButton("2");
	  button2.addActionListener(action);	  	  
	  panel.add(button2);	 	
	  
	  JButton button3 = new JButton("3");
	  button3.addActionListener(action);	  	  
	  panel.add(button3);	 
	  
	  JButton buttonSub = new JButton("-");
	  buttonSub.setForeground(Color.red);
      buttonSub.addActionListener(action);	  
	  panel.add(buttonSub);
	  
	  JButton buttonRec = new JButton("1/x");
	  buttonRec.addActionListener(action);	 
	  panel.add(buttonRec);	  	 
	  
//line 5 . 	 	  
	  JButton buttonM= new JButton("M+");
	  buttonM.setForeground(Color.red);
      buttonM.addActionListener(action);	 
	  panel.add(buttonM);	  
	  
	  JButton button0 = new JButton("0");
	  button0.addActionListener(action);	  	  
	  panel.add(button0);	 
	  	 
	  JButton buttonRev = new JButton("+/-");
      buttonRev.addActionListener(action);	  
	  panel.add(buttonRev);	 
	  	
	  JButton buttonPoint = new JButton(".");
      buttonPoint.addActionListener(action);	  
	  panel.add(buttonPoint);
	  	 
	  JButton buttonAdd = new JButton("+");
	  buttonAdd.setForeground(Color.red);
      buttonAdd.addActionListener(action);	  
	  panel.add(buttonAdd);
	  
	  JButton buttonEqual = new JButton("=");
	  buttonEqual.setForeground(Color.red);
	  buttonEqual.addActionListener(action);
	  panel.add(buttonEqual);	  


	  contentPane = getContentPane();
   	  contentPane.add(panel,BorderLayout.CENTER);  		// add panel to frame
   }
   class PressAction implements ActionListener			// define actionListener
   {
		public void actionPerformed(ActionEvent e)
		{
			String s = e.getActionCommand().trim();    // 	get ActionCommand
			if(s.equals("="))           ActionEqual();
			if(s.equals("Backspace"))	ActionBackSpace();
			if(s.equals("CE"))			ActionCE();
			if(s.equals("C"))			ActionC();
			
			if(s=="0"| s=="1"|s=="2"|s=="3"|s=="4"|s=="5"|s=="6"|s=="7"|s=="8"|s=="9")	
				Action0$9(s);
			if(s=="+"|s=="-")			
				ActionAddSub(s);
			if(s=="*"|s=="/"|s=="%")			
				ActionMulDev(s);				
		
			if(s.equals("1/x"))         ActionRec();
			if(s.equals("."))			ActionPoint();
			if(s.equals("sqrt"))		ActionSqrt();
			if(s.equals("M+"))			ActionM();
			if(s.equals("MR"))    	    ActionMR();
			if(s.equals("MC"))			ActionMC();
			if(s.equals("MS"))			ActionMS();
			if(s.equals("+/-"))			ActionRev();
		}   		
   }
 ///  Action  define  
   private double n,m,k;		//文本框记录或者中间数据
   private boolean sign;    //标记是否从新输入，true 追加数字，false 记下当前数字，重新输入
   private String str,str1;      //记下运算符号， 
 

    public void Action0$9(String s)          //  bounton  "0"-"9"  action
    {
		if(sign)
			showTextField.setText(showTextField.getText()+s);
		else
		{	showTextField.setText(s);sign = true;}    	
    }
    public void ActionCE()          //  bounton  "CE"  action
   	{
		showTextField.setText("0");
		sign = false;
   	}
    public void ActionC()          //  bounton  "C"  action
    {
		showTextField.setText("0");
		n=0;
		sign = false; 
		str="";    	
    }
    public void ActionRec()          //  bounton  "1/x"  action
    {
		showTextField.setText(Double.toString(1/Double.parseDouble(showTextField.getText())));
		sign = false;
    }
    public void ActionBackSpace()          //  bounton  "backSpace"  action
    {
    	String s = showTextField.getText();
    	if(s.length()>1)
	    	showTextField.setText(s.substring(0,s.length()-1));
	    else
	    {	showTextField.setText("0");	  sign=false; } 	
    }
    public void ActionSqrt()          //  bounton  "sqrt"  action
    {
		showTextField.setText(Double.toString(Math.sqrt(Double.parseDouble(showTextField.getText()))));
		sign = false;
	}
    public void ActionPoint()          //  bounton  "."  action
    {
    	String s = showTextField.getText();
    	boolean flag = true;
    	for(int i = 0;i<s.length();i++)
    	{
	     	if(s.charAt(i)=='.')	flag=false;	   		
    	}
		if(flag)
			showTextField.setText(showTextField.getText()+".");   
		if(!sign)
		{	showTextField.setText("0."); this.sign=true;
		}	 	
    }
    public void ActionMC()          //  bounton  "MC"  action
    {
    	this.Space.setText("  ");
    	m=0;
    }
    public void ActionMS()          //  bounton  "MS"  action
    {
    	this.Space.setText("M");
    	m=Double.parseDouble(showTextField.getText());
    	this.sign = false ;
    }
    public void ActionMR()          //  bounton  "MR"  action
    {
		this.showTextField.setText(""+m);
		this.sign = false;
    }
    public void ActionM()          //  bounton  "M+"  action
    {
    	this.Space.setText("M");
    	m = m+Double.parseDouble(showTextField.getText()); 
    	this.sign = false ;   	
    }
    public void ActionRev()          //  bounton  "+/-"  action
    {
   		String s = showTextField.getText();
   		double d = Double.parseDouble(s);
   		if(d!=0)
   			d = - d ;
   		showTextField.setText(Double.toString(d));
   		this.sign = false ;
    }
   
    public void ActionAddSub(String s)          //  bounton  "+" "-" action
    {
		if(!str.equals(""))
			ActionEqual();
		if(str1!="")
		{	
			ActionEqual();
			n = k;
			str =str1;
			str1="";
			ActionEqual();			
		}
		str = s;
		n = Double.parseDouble(showTextField.getText());
		sign = false;       	
    }
 
    public void ActionMulDev(String s)          //  bounton  "%" "*" "/" action
    {
		if(str==s)
		{
			ActionEqual();    
		}
		else									// calculate 
		{
			k=n;		
			str1=str;		
		}
		str = s;
		n = Double.parseDouble(showTextField.getText());		
		sign = false; 		  	
    }    

	public void ActionEqual()          //  bounton  "="  action
	{
		double t=Double.parseDouble(showTextField.getText());
		if(str.equals( "/")) 
			n = n/t;
		if(str.equals("*")) 
			n = n*t;
		if(str.equals( "-")) 
			n = n-t;
		if(str.equals("+")) 
			n = n+t;
		if(str.equals("%")) 
			n = n%t;		
		if(str1!="")
		{
			str=str1;
			str1="";
			showTextField.setText(Double.toString(n));
			n = k ;
			ActionEqual();
		}
		str="";
		showTextField.setText(Double.toString(n));
		sign = false;				  	
	}
	
   public static final int WIDTH = 310;
   public static final int HEIGHT = 250;	
}
//  end   //