Using Netbeans (or Eclipse or any other IDE of your liking) Create a Java applic

Question

Using Netbeans (or Eclipse or any other IDE of your liking) Create a Java application that implements a calculator, with design and features which are similar to the standard calculator that comes with Windows (Accessories calculator). The calculator will have at least the following operations addition, subtraction, multiplication, division, change sign, reciprocal (1/x), squareroot and clear. If you want you can add more operations like the trigonometrical operations (sine, cosine, and tangent) will be fine. Implementation of a decimal rightarrow binary and binary rightarrow decimal convener will be used for 10% extra credit. An example of a possible GUI is shown below

Explanation / Answer

import java.awt.*;

import java.awt.event.*;

public class MyCalculator extends Frame

{

public boolean setClear=true;

double number, memValue;

char op;

String digitButtonText[] = {"7", "8", "9", "4", "5", "6", "1", "2", "3", "0", "+/-", "." };

String operatorButtonText[] = {"/", "sqrt", "*", "%", "-", "1/X", "+", "=" };

String memoryButtonText[] = {"MC", "MR", "MS", "M+" };

String specialButtonText[] = {"Backspc", "C", "CE" };

MyDigitButton digitButton[]=new MyDigitButton[digitButtonText.length];

MyOperatorButton operatorButton[]=new MyOperatorButton[operatorButtonText.length];

MyMemoryButton memoryButton[]=new MyMemoryButton[memoryButtonText.length];

MySpecialButton specialButton[]=new MySpecialButton[specialButtonText.length];

Label displayLabel=new Label("0",Label.RIGHT);

Label memLabel=new Label(" ",Label.RIGHT);

final int FRAME_WIDTH=325,FRAME_HEIGHT=325;

final int HEIGHT=30, WIDTH=30, H_SPACE=10,V_SPACE=10;

final int TOPX=30, TOPY=50;

MyCalculator(String frameText)

{

super(frameText);

int tempX=TOPX, y=TOPY;

displayLabel.setBounds(tempX,y,240,HEIGHT);

displayLabel.setBackground(Color.BLUE);

displayLabel.setForeground(Color.WHITE);

add(displayLabel);

memLabel.setBounds(TOPX,  TOPY+HEIGHT+ V_SPACE,WIDTH, HEIGHT);

add(memLabel);

tempX=TOPX;

y=TOPY+2*(HEIGHT+V_SPACE);

for(int i=0; i<memoryButton.length; i++)

{

memoryButton[i]=new MyMemoryButton(tempX,y,WIDTH,HEIGHT,memoryButtonText[i], this);

memoryButton[i].setForeground(Color.RED);

y+=HEIGHT+V_SPACE;

}

tempX=TOPX+1*(WIDTH+H_SPACE); y=TOPY+1*(HEIGHT+V_SPACE);

for(int i=0;i<specialButton.length;i++)

{

specialButton[i]=new MySpecialButton(tempX,y,WIDTH*2,HEIGHT,specialButtonText[i], this);

specialButton[i].setForeground(Color.RED);

tempX=tempX+2*WIDTH+H_SPACE;

}

int digitX=TOPX+WIDTH+H_SPACE;

int digitY=TOPY+2*(HEIGHT+V_SPACE);

tempX=digitX;  y=digitY;

for(int i=0;i<digitButton.length;i++)

{

digitButton[i]=new MyDigitButton(tempX,y,WIDTH,HEIGHT,digitButtonText[i], this);

digitButton[i].setForeground(Color.BLUE);

tempX+=WIDTH+H_SPACE;

if((i+1)%3==0){tempX=digitX; y+=HEIGHT+V_SPACE;}

}

int opsX=digitX+2*(WIDTH+H_SPACE)+H_SPACE;

int opsY=digitY;

tempX=opsX;  y=opsY;

for(int i=0;i<operatorButton.length;i++)

{

tempX+=WIDTH+H_SPACE;

operatorButton[i]=new MyOperatorButton(tempX,y,WIDTH,HEIGHT,operatorButtonText[i], this);

operatorButton[i].setForeground(Color.RED);

if((i+1)%2==0){tempX=opsX; y+=HEIGHT+V_SPACE;}

}

addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent ev)

{System.exit(0);}

});

setLayout(null);

setSize(FRAME_WIDTH,FRAME_HEIGHT);

setVisible(true);

}

static String getFormattedText(double temp)

{

String resText=""+temp;

if(resText.lastIndexOf(".0")>0)

resText=resText.substring(0,resText.length()-2);

return resText;

}

public static void main(String []args)

{

new MyCalculator("Calculator - JavaTpoint");

}

}

class MyDigitButton extends Button implements ActionListener

{

MyCalculator cl;

MyDigitButton(int x,int y, int width,int height,String cap, MyCalculator clc)

{

super(cap);

setBounds(x,y,width,height);

this.cl=clc;

this.cl.add(this);

addActionListener(this);

}

static boolean isInString(String s, char ch)

{

for(int i=0; i<s.length();i++) if(s.charAt(i)==ch) return true;

return false;

}

public void actionPerformed(ActionEvent ev)

{

String tempText=((MyDigitButton)ev.getSource()).getLabel();

if(tempText.equals("."))

{

if(cl.setClear)

{cl.displayLabel.setText("0.");cl.setClear=false;}

else if(!isInString(cl.displayLabel.getText(),'.'))

cl.displayLabel.setText(cl.displayLabel.getText()+".");

return;

}

int index=0;

try{

index=Integer.parseInt(tempText);

}catch(NumberFormatException e){return;}

if (index==0 && cl.displayLabel.getText().equals("0")) return;

if(cl.setClear)

{cl.displayLabel.setText(""+index);cl.setClear=false;}

else

cl.displayLabel.setText(cl.displayLabel.getText()+index);

}

}

class MyOperatorButton extends Button implements ActionListener

{

MyCalculator cl;

MyOperatorButton(int x,int y, int width,int height,String cap, MyCalculator clc)

{

super(cap);

setBounds(x,y,width,height);

this.cl=clc;

this.cl.add(this);

addActionListener(this);

}

public void actionPerformed(ActionEvent ev)

{

String opText=((MyOperatorButton)ev.getSource()).getLabel();

cl.setClear=true;

double temp=Double.parseDouble(cl.displayLabel.getText());

if(opText.equals("1/x"))

{

try

{double tempd=1/(double)temp;

cl.displayLabel.setText(MyCalculator.getFormattedText(tempd));}

catch(ArithmeticException excp)

{cl.displayLabel.setText("Divide by 0.");}

return;

}

if(opText.equals("sqrt"))

{

try

{double tempd=Math.sqrt(temp);

cl.displayLabel.setText(MyCalculator.getFormattedText(tempd));}

catch(ArithmeticException excp)

{cl.displayLabel.setText("Divide by 0.");}

return;

}

if(!opText.equals("="))

{

cl.number=temp;

cl.op=opText.charAt(0);

return;

}

switch(cl.op)

{

case '+':

temp+=cl.number;break;

case '-':

temp=cl.number-temp;break;

case '*':

temp*=cl.number;break;

case '%':

try{temp=cl.number%temp;}

catch(ArithmeticException excp)

{cl.displayLabel.setText("Divide by 0."); return;}

break;

case '/':

try{temp=cl.number/temp;}

catch(ArithmeticException excp)

{cl.displayLabel.setText("Divide by 0."); return;}

break;

}

cl.displayLabel.setText(MyCalculator.getFormattedText(temp));

class MyMemoryButton extends Button implements ActionListener

{

MyCalculator cl;

MyMemoryButton(int x,int y, int width,int height,String cap, MyCalculator clc)

{

super(cap);

setBounds(x,y,width,height);

this.cl=clc;

this.cl.add(this);

addActionListener(this);

}

public void actionPerformed(ActionEvent ev)

{

char memop=((MyMemoryButton)ev.getSource()).getLabel().charAt(1);

cl.setClear=true;

double temp=Double.parseDouble(cl.displayLabel.getText());

switch(memop)

{

case 'C':

cl.memLabel.setText(" ");cl.memValue=0.0;break;

case 'R':

cl.displayLabel.setText(MyCalculator.getFormattedText(cl.memValue));break;

case 'S':

cl.memValue=0.0;

case '+':

cl.memValue+=Double.parseDouble(cl.displayLabel.getText());

if(cl.displayLabel.getText().equals("0") || cl.displayLabel.getText().equals("0.0")  )

cl.memLabel.setText(" ");

else

cl.memLabel.setText("M");

break;

}

}

}

class MySpecialButton extends Button implements ActionListener

{

MyCalculator cl;

MySpecialButton(int x,int y, int width,int height,String cap, MyCalculator clc)

{

super(cap);

setBounds(x,y,width,height);

this.cl=clc;

this.cl.add(this);

addActionListener(this);

}

static String backSpace(String s)

{

String Res="";

for(int i=0; i<s.length()-1; i++) Res+=s.charAt(i);

return Res;

}

public void actionPerformed(ActionEvent ev)

{

String opText=((MySpecialButton)ev.getSource()).getLabel();

if(opText.equals("Backspc"))

{

String tempText=backSpace(cl.displayLabel.getText());

if(tempText.equals(""))

cl.displayLabel.setText("0");

else

cl.displayLabel.setText(tempText);

return;

}

if(opText.equals("C"))

{

cl.number=0.0; cl.op=' '; cl.memValue=0.0;

cl.memLabel.setText(" ");

}

cl.displayLabel.setText("0");cl.setClear=true;

}

}

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