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Calculator.java
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Calculator.java
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import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
public class Calculator implements ActionListener {
Boolean isOperatorClicked=false;
Boolean isNumberClicked=false;
double etemp,value2,value1;
double atemp;
double oldValue1,oldValue2,oldValueMinus,oldValueDiv,oldValueMul,oldValueAdd;
double resultMinus,resultAdd,resultMul,resultDiv;
double oldValueAddDemo;
String temp;
String trial;
double newValueAdd,newValueMinus,newValueDiv,newValueMul;
double minus,add,mul,div;
JFrame jf;
JLabel displayLabel;
JLabel displayLabel2;
JButton sevenButton;
JButton eightButton;
JButton nineButton;
JButton fourButton;
JButton fiveButton;
JButton sixButton;
JButton threeButton;
JButton twoButton;
JButton oneButton;
JButton dotButton;
JButton zeroButton;
JButton equalButton;
JButton divButton;
JButton mulButton;
JButton minusButton;
JButton addButton;
JButton clearButton;
JButton backButton;
JButton plusMinusButton;
public Calculator() {
jf=new JFrame("CALCULATOR");
jf.setLayout(null);
jf.setSize(600, 600);
jf.setLocation(300, 120);
displayLabel2 = new JLabel();
displayLabel2.setBounds(30, 20, 540, 40);
displayLabel2.setBackground(Color.blue);
displayLabel2.setOpaque(true);
displayLabel2.setHorizontalAlignment(SwingConstants.RIGHT);
displayLabel2.setForeground(Color.WHITE);
displayLabel2.setFont(new Font("Arial", Font.PLAIN, 15));
jf.add(displayLabel2);
displayLabel = new JLabel();
displayLabel.setBounds(30,71, 540, 40);
displayLabel.setBackground(Color.GRAY);
displayLabel.setOpaque(true);
displayLabel.setHorizontalAlignment(SwingConstants.RIGHT);
displayLabel.setForeground(Color.WHITE);
displayLabel.setFont(new Font("Times New Roman", Font.PLAIN, 19));
jf.add(displayLabel);
sevenButton = new JButton("7");
sevenButton.setBounds(30, 120, 80, 80);
sevenButton.addActionListener(this);
sevenButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(sevenButton);
eightButton = new JButton("8");
eightButton.setBounds(130, 120, 80, 80);
eightButton.addActionListener(this);
eightButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(eightButton);
nineButton = new JButton("9");
nineButton.setBounds(230, 120, 80, 80);
nineButton.addActionListener(this);
nineButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(nineButton);
fourButton = new JButton("4");
fourButton.setBounds(30, 220, 80, 80);
fourButton.addActionListener(this);
fourButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(fourButton);
fiveButton = new JButton("5");
fiveButton.setBounds(130, 220, 80, 80);
fiveButton.addActionListener(this);
fiveButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(fiveButton);
sixButton = new JButton("6");
sixButton.setBounds(230, 220, 80, 80);
sixButton.addActionListener(this);
sixButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(sixButton);
oneButton = new JButton("1");
oneButton.setBounds(30, 320, 80, 80);
oneButton.addActionListener(this);
oneButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(oneButton);
twoButton = new JButton("2");
twoButton.setBounds(130, 320, 80, 80);
twoButton.addActionListener(this);
twoButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(twoButton);
threeButton = new JButton("3");
threeButton.setBounds(230, 320, 80, 80);
threeButton.addActionListener(this);
threeButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(threeButton);
zeroButton = new JButton("0");
zeroButton.setBounds(30, 420, 80, 80);
zeroButton.addActionListener(this);
zeroButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(zeroButton);
dotButton = new JButton(".");
dotButton.setBounds(130, 420, 80, 80);
dotButton.addActionListener(this);
dotButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(dotButton);
equalButton = new JButton("=");
equalButton.setBounds(230, 420, 80, 80);
equalButton.addActionListener(this);
equalButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(equalButton);
divButton = new JButton("/");
divButton.setBounds(330, 120, 80, 80);
divButton.addActionListener(this);
divButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(divButton);
mulButton = new JButton("*");
mulButton.setBounds(330, 220, 80, 80);
mulButton.addActionListener(this);
mulButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(mulButton);
minusButton = new JButton("-");
minusButton.setBounds(330, 320, 80, 80);
minusButton.addActionListener(this);
minusButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(minusButton);
addButton = new JButton("+");
addButton.setBounds(330, 420, 80, 80);
addButton.addActionListener(this);
addButton.setFont(new Font("Arial", Font.PLAIN, 40));
jf.add(addButton);
clearButton = new JButton("CLEAR");
clearButton.setBounds(430, 420, 140, 80);
clearButton.addActionListener(this);
clearButton.setFont(new Font("Arial", Font.PLAIN, 30));
jf.add(clearButton);
backButton = new JButton("BACK");
backButton.setBounds(430, 320, 140, 80);
backButton.addActionListener(this);
backButton.setFont(new Font("Arial", Font.PLAIN, 30));
jf.add(backButton);
plusMinusButton = new JButton("+/-");
plusMinusButton.setBounds(430, 120, 140, 80);
plusMinusButton.addActionListener(this);
plusMinusButton.setFont(new Font("Arial", Font.PLAIN, 30));
jf.add(plusMinusButton);
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new Calculator();
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==sevenButton){
if(isNumberClicked){
displayLabel.setText("7");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"7");
}
}
else if(e.getSource()==eightButton){
if(isNumberClicked){
displayLabel.setText("8");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"8");
}
}
else if(e.getSource()==nineButton){
if(isNumberClicked){
displayLabel.setText("9");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"9");
}
}
else if(e.getSource()==fourButton){
if(isNumberClicked){
displayLabel.setText("4");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"4");
}
}
else if(e.getSource()==fiveButton){
if(isNumberClicked){
displayLabel.setText("5");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"5");
}
}
else if(e.getSource()==sixButton){
if(isNumberClicked){
displayLabel.setText("6");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"6");
}
}
else if(e.getSource()==oneButton){
if(isNumberClicked){
displayLabel.setText("1");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"1");
}
}
else if(e.getSource()==twoButton){
if(isNumberClicked){
displayLabel.setText("2");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"2");
}
}
else if(e.getSource()==threeButton){
if(isNumberClicked){
displayLabel.setText("3");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"3");
}
}
else if(e.getSource()==zeroButton){
if(isNumberClicked){
displayLabel.setText("0");
isNumberClicked=false;
}
else{
displayLabel.setText(displayLabel.getText()+"0");
}
}
else if(e.getSource()==dotButton){
if(isNumberClicked){
String dotValueChecker=displayLabel.getText();
if(dotValueChecker.contains(".")==false && dotValueChecker!=""){
displayLabel.setText(".");
isNumberClicked=false;
}
else if(dotValueChecker.contains(".")==false && dotValueChecker==""){
displayLabel.setText("0.");
isNumberClicked=false;
}
}
else{
String dotValueChecker=displayLabel.getText();
if(dotValueChecker.contains(".")==false && dotValueChecker!=""){
displayLabel.setText(displayLabel.getText()+".");
}
else if(dotValueChecker.contains(".")==false && dotValueChecker==""){
displayLabel.setText(displayLabel.getText()+"0.");
}
}
}
else if(e.getSource()==equalButton){
if(temp=="-"){
if(newValueMinus==0){
isNumberClicked=true;
newValueMinus=Double.parseDouble(displayLabel.getText());
if(minus==0){
double minus1=newValueMinus;
double mi=oldValueMinus;
resultMinus=mi-minus1;
String answerMinus=String.format("%.2f",resultMinus);
displayLabel.setText(answerMinus);
displayLabel2.setText(mi+"-"+minus1);
}
}
else if(newValueMinus!=0){
isNumberClicked=true;
double minus2=newValueMinus;
displayLabel2.setText(resultMinus+"-"+minus2);
resultMinus=resultMinus-minus2;
String answerMinus=String.format("%.2f",resultMinus);
displayLabel.setText(answerMinus);
}
}
else if(temp=="+"){
if(newValueAdd==0){
isNumberClicked=true;
newValueAdd=Double.parseDouble(displayLabel.getText());
if(add==0){
double add1=newValueAdd;
double a=oldValueAdd;
resultAdd=a+add1;
String answerAdd=String.format("%.2f",resultAdd);
displayLabel.setText(answerAdd);
displayLabel2.setText(a+"+"+add1);
}
}
else if(newValueAdd!=0){
isNumberClicked=true;
double add2=newValueAdd;
displayLabel2.setText(resultAdd+"+"+add2);
resultAdd=resultAdd+add2;
String answerAdd=String.format("%.2f",resultAdd);
displayLabel.setText(answerAdd);
}
}
else if(temp=="*"){
if(newValueMul==0){
isNumberClicked=true;
newValueMul=Double.parseDouble(displayLabel.getText());
if(mul==0){
double mul1=newValueMul;
double m=oldValueMul;
resultMul=m*mul1;
String answerMul=String.format("%.2f",resultMul);
displayLabel.setText(answerMul);
displayLabel2.setText(m+"*"+mul1);
}
}
else if(newValueMul!=0){
isNumberClicked=true;
double mul2=newValueMul;
displayLabel2.setText(resultMul+"*"+mul2);
resultMul=resultMul*mul2;
String answerMul=String.format("%.2f",resultMul);
displayLabel.setText(answerMul);
}
}
else if(temp=="/"){
if(newValueDiv==0){
isNumberClicked=true;
newValueDiv=Double.parseDouble(displayLabel.getText());
if(div==0){
double div1=newValueDiv;
double d=oldValueDiv;
resultDiv=d/div1;
String answerDiv=String.format("%.2f",resultDiv);
displayLabel.setText(answerDiv);
displayLabel2.setText(d+"/"+div1);
}
}
else if(newValueDiv!=0){
isNumberClicked=true;
double div2=newValueDiv;
displayLabel2.setText(resultDiv+"/"+div2);
resultDiv=resultDiv/div2;
String answerDiv=String.format("%.2f",resultDiv);
displayLabel.setText(answerDiv);
}
}
else{
String equalValueChecker=displayLabel.getText();
if(equalValueChecker.contains("")==false){
if(etemp==0 && value1==0){
oldValue1=Double.parseDouble(displayLabel.getText());
value1=oldValue1;
String answer1=String.format("%.2f",value1);
displayLabel.setText(answer1);
etemp=value1;
}
else if(etemp!=0 && etemp!=value1) {
oldValue2=Double.parseDouble(displayLabel.getText());
value2=oldValue2;
String answer2=String.format("%.2f",value2);
displayLabel.setText(answer2);
}
}
}
}
else if(e.getSource()==divButton){
String z=displayLabel.getText();
if(z!=""){
newValueDiv=0;
oldValueDiv=0;
if(oldValueDiv==0){
isOperatorClicked=true;
isNumberClicked=true;
temp="/";
div=0;
double q=0;
q=Double.parseDouble(displayLabel.getText());
oldValueDiv=q;
q=0;
displayLabel2.setText(oldValueDiv+"/ ");
}
}
}
else if(e.getSource()==mulButton){
String z=displayLabel.getText();
if(z!=""){
newValueMul=0;
oldValueMul=0;
if(oldValueMul==0){
isOperatorClicked=true;
isNumberClicked=true;
temp="*";
mul=0;
double q=0;
q=Double.parseDouble(displayLabel.getText());
oldValueMul=q;
q=0;
displayLabel2.setText(oldValueMul+"* ");
}
}
}
else if(e.getSource()==minusButton){
String z=displayLabel.getText();
if(z!=""){
newValueMinus=0;
oldValueMinus=0;
if(oldValueMinus==0){
isOperatorClicked=true;
isNumberClicked=true;
temp="-";
newValueMinus=0;
minus=0;
double q=0;
q=Double.parseDouble(displayLabel.getText());
oldValueMinus=q;
q=0;
displayLabel2.setText(oldValueMinus+"- ");
}
}
}
else if(e.getSource()==addButton){
String z=displayLabel.getText();
if(z!=""){
newValueAdd=0;
oldValueAdd=0;
if(oldValueAdd==0){
isOperatorClicked=true;
isNumberClicked=true;
temp="+";
newValueAdd=0;
add=0;
double q=0;
q=Double.parseDouble(displayLabel.getText());
oldValueAdd=q;
q=0;
displayLabel2.setText(oldValueAdd+"+ ");
}
}
}
else if(e.getSource()==clearButton){
displayLabel.setText("");
displayLabel2.setText("");
etemp=0;
temp=null;
oldValue1=0;
oldValue2=0;
value1=0;
value2=0;
oldValueMinus=0;
oldValueDiv=0;
oldValueAdd=0;
oldValueMul=0;
resultMinus=0;
resultAdd=0;
resultMul=0;
resultDiv=0;
newValueAdd=0;
newValueMinus=0;
newValueDiv=0;
newValueMul=0;
div=0;
mul=0;
add=0;
minus=0;
isOperatorClicked=false;
isNumberClicked=true;
trial="";
}
else if(e.getSource()==backButton){
String mincheck1=displayLabel.getText();
if(mincheck1.contains("-")==true){
String bb=displayLabel.getText();
StringBuffer sb=new StringBuffer(bb);
sb.deleteCharAt(0);
String ss=sb.toString();
displayLabel.setText(ss);
}
else{
trial=displayLabel.getText();
if( trial!=""){
String bb=displayLabel.getText();
StringBuffer sb=new StringBuffer(bb);
sb.deleteCharAt(sb.length()-1);
String ss=sb.toString();
displayLabel.setText(ss);
bb="";
trial="";
displayLabel2.setText("");
}
else if(trial==""){
displayLabel.setText("");
displayLabel2.setText("");
}
}
}
else if(e.getSource()==plusMinusButton){
String mincheck=displayLabel.getText();
if(mincheck.contains("-")==true){
String bb=displayLabel.getText();
StringBuffer sb=new StringBuffer(bb);
sb.deleteCharAt(0);
String ss=sb.toString();
displayLabel.setText(ss);
}
else{
if(isNumberClicked){
String minValueChecker=displayLabel.getText();
if(minValueChecker.contains("-")==false && minValueChecker!=""){
displayLabel.setText("-");
isNumberClicked=false;
}
else if(minValueChecker.contains("-")==false && minValueChecker==""){
displayLabel.setText("-0");
isNumberClicked=false;
}
}
else{
String minValueChecker=displayLabel.getText();
if(minValueChecker.contains("-")==false && minValueChecker!=""){
displayLabel.setText("-"+displayLabel.getText());
}
else if(minValueChecker.contains("-")==false && minValueChecker==""){
displayLabel.setText("-0"+displayLabel.getText());
}
}
}
}
}
}