myframe1.java~1~

来自「教材管理系统」· JAVA~1~ 代码 · 共 245 行

//计算器类



package bookmanager;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.sql.*;
import com.borland.jbcl.layout.*;

public class Calculator extends JInternalFrame implements ActionListener
{
        private JTextField displayText=new JTextField();
        private JButton buttonTag=new JButton();
        private JButton buttonBackspace=new JButton("Backspace");
        private JButton buttonCe=new JButton("CE");
        private JButton buttonc=new JButton("C");
        private JButton[] button=new JButton[24];
        private String[] keys={"MC","7","8","9","/","sqrt","MR","4","5","6","*","%",
                                "MS","1","2","3","-","1/x","M+","0","+/-",".","+","="};


        private String numStr1="";
        private String numStr2="";
        private String numsave="";

        private char op;
        private boolean firstInput=true;
        private boolean operatorTag1=true;
        private boolean operatorTag2=true;
  XYLayout xYLayout1 = new XYLayout();

//	private JMenuBar mb=new JMenuBar();
//	private JMenu editMenu=new JMenu("编辑");
//	private JMenu seeMenu=new JMenu("查看");
//	private JMenu helpMenu=new JMenu("帮助");


        public Calculator(){
                setTitle("计算器");
                setSize(345,265);
                Container pane=getContentPane();
                //displayText.setBackground(Color.blue);
//		editMenu.add("复制");
//		editMenu.add("粘贴");
//		seeMenu.add("标准型");
//		seeMenu.add("科学型");
//		seeMenu.addSeparator();
//		seeMenu.add("数字型");
//		helpMenu.add("帮助主题");
//		helpMenu.addSeparator();
//		helpMenu.add("关于计算器");
//		mb.add(editMenu);
//		mb.add(seeMenu);
//		mb.add(helpMenu);
//		setJMenuBar(mb);
                pane.setLayout(null);

        displayText.setHorizontalAlignment(JTextField.RIGHT);
                displayText.setSize(320,30);
                displayText.setLocation(10,10);
                pane.add(displayText);

                buttonTag.setSize(60,30);
                buttonTag.setLocation(10,50);
                pane.add(buttonTag);

                buttonBackspace.setSize(110,30);
                buttonBackspace.setLocation(90,50);
                buttonBackspace.setForeground(Color.red);
                buttonBackspace.addActionListener(this);
                pane.add(buttonBackspace);

                buttonCe.setSize(65,30);
                buttonCe.setLocation(200,50);
                buttonCe.setForeground(Color.red);
                pane.add(buttonCe);

                buttonc.setSize(65,30);
                buttonc.setLocation(265,50);
                buttonc.setForeground(Color.red);
                buttonc.addActionListener(this);
                pane.add(buttonc);

                int x,y;

                x=10;
                y=85;
                for(int ind=0;ind<24;ind++){
                        //button[ind].setFont(new Font("Times New Roman",Font.PLAIN,14));
                        button[ind]=new JButton(keys[ind]);
                        button[ind].addActionListener(this);
                        button[ind].setLocation(x,y);
                        if(ind%6==0 || ind%6==5)
                                {button[ind].setSize(60,30);
                                x=x+60;}
                        else
                                {button[ind].setSize(50,30);
                                x=x+50;}

                        if(ind%6==0 || ind%6==4 ||ind%24==23)
                                button[ind].setForeground(Color.red);
                        else
                                button[ind].setForeground(Color.blue);

                        pane.add(button[ind]);

                        if((ind+1)%6==0)
                                {
                                x=10;
                                y=y+30;
                                }
                        }
//		this.addWindowListener(new WindowAdapter(){
//			public void windowClosing(WindowEvent e)
//				{
//				System.exit(0);
//				}
//			});
                setVisible(true);
                this.setClosable(true);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
                }

        public void actionPerformed(ActionEvent e){
                        String resultStr="";

                        String str=String.valueOf(e.getActionCommand());
                        char ch=str.charAt(0);

                        if(str.equals("0")||str.equals("1")||str.equals("2")||str.equals("3")
||str.equals("4")||
                                str.equals("5")||str.equals("6")||str.equals("7")||str.equals("8")||
                                str.equals("9")||str.equals(".")){
                                                if(firstInput){
                                                        numStr1=numStr1+ch;
                                                        displayText.setText(numStr1);
                                                        }
                                                else{
                                                        numStr2=numStr2+ch;
                                                        displayText.setText(numStr2);
                                                        }
                                                }
                        else if(str.equals("+")||str.equals("-")||str.equals("*")
                                                ||str.equals("/") & operatorTag2){
                                                if(numStr2.equals(""))
                                        op=ch;
                                        else{
                                                resultStr=evaluate();
                                                displayText.setText(resultStr);
                                                numStr1=resultStr;
                                                    numStr2="";
                                                    op=ch;
                                                }
                                                firstInput=false;
                                                //operatorTag1=false;
                                                }
                        else if(str.equals("=")){
                                                resultStr=evaluate();
                                                displayText.setText(resultStr);
                                                numStr1="";
                                                numStr2="";
                                                firstInput=true;
                                        }
                        else if(str.equals("C")){
                                                displayText.setText("");
                                                numStr1="";
                                                numStr2="";
                                                firstInput=true;
                                }
                        else if((str.equals("sqrt")|str.equals("1/x")) & !numStr1.equals("")&
operatorTag1){
                                float A=Float.parseFloat(numStr1);
                                float result=0;
                                if(str.equals("sqrt"))
                                        result=(float)Math.sqrt(A);
                                if(str.equals("1/x"))
                                        result=1/A;
                                numStr1=Float.toString(result);
                                displayText.setText(numStr1);
                                firstInput=false;
                                //operatorTag2=false;
                                }
                        else if (str.equals("Backspace")){
                                String str1=displayText.getText();
                                if(!str1.equals("")){
                                        displayText.setText(str1.substring(0,str1.length()-1));
                                if(!numStr1.equals(""))
                                        numStr1=displayText.getText();
                                else
                                        numStr2=displayText.getText();
                                        }
                                }
                        else if(str.equals("MS")){
                                numsave=displayText.getText();
                                buttonTag.setText("M");
                            numStr1="";
                                }
                        else if(str.equals("MC")){
                                numsave="";
                                buttonTag.setText("");
                                }
                        else if (str.equals("MR")){
                                displayText.setText(numsave);
                                }
                        else if(str.equals("M+")){

                                }
                        }

        private String evaluate(){
                //final char beep='\n0007';
                if(!numStr1.equals("") & !numStr2.equals("")){
                        float A=Float.parseFloat(numStr1);
                        float B=Float.parseFloat(numStr2);
                        float result=0;
                        switch(op){
                                        case '+':result=A+B;break;
                                        case '-':result=A-B;break;
                                        case '*':result=A*B;break;
                                        case '/':result=A/B;break;
                                        }
                        return String.valueOf(result);
                        }
                else
                        return numStr1;
                }
  private void jbInit() throws Exception {
    this.getContentPane().setLayout(xYLayout1);
  }

//	public static void main(String []args){
//		Calculator C=new Calculator();
//		C.setResizable(false);
//		}
}