Simple Calculator Application using java swing

Note: Set Property of all Button and JFrame as per your Choice.

Programming Parts:

1) Define the Variables in the Class as follows:

public class calciForm extends javax.swing.JFrame {
String str="";
int opera =0,id =0;
double value1=0,value2=0;
public calciForm() {
initComponents();
display.setText("0");
      
}
}

2) On double click on any numeric Button, Source Code Page will open and Cursor will blink near Numeric Button. Paste the below code between open and close bracket according to numeric Button.

For Button Zero:-
private void zeroMouseClicked(java.awt.event.MouseEvent evt) {      
        if(!str.equals(""))
        {
            str = str +"0";
             display.setText(str);
        }
        else
        {
             str="";
             display.setText("0");
        }
       
    }     

For Button 1:- 
    private void oneMouseClicked(java.awt.event.MouseEvent evt) {  
        str = str +"1";
        display.setText(str);
    }                                

For Button 2:-
    private void twoMouseClicked(java.awt.event.MouseEvent evt) {           
        str = str +"2";
        display.setText(str);
    }                                

For Button 3:-
    private void threeMouseClicked(java.awt.event.MouseEvent evt) {  
        str = str +"3";
        display.setText(str);
    }                                  

For Button 4:-
    private void fourMouseClicked(java.awt.event.MouseEvent evt) {       
        str = str +"4";
        display.setText(str);
    }                                 

For Button 5:-
    private void fiveMouseClicked(java.awt.event.MouseEvent evt) {    
        str = str +"5";
        display.setText(str);
    }                                 

For Button 6:-
    private void sixMouseClicked(java.awt.event.MouseEvent evt) {           
        str = str +"6";
        display.setText(str);
    }                                

For Button 7:-
    private void sevenMouseClicked(java.awt.event.MouseEvent evt) {             
        str = str +"7";
        display.setText(str);
    }                                  

For Button 8:-
    private void eightMouseClicked(java.awt.event.MouseEvent evt) {   
        str = str +"8";
        display.setText(str);
    }                 

For Button 9:-
    private void nineMouseClicked(java.awt.event.MouseEvent evt) {        
        str = str +"9";
        display.setText(str);
    }     

3) On double click on Decimal Button, Source Code Page will open and Cursor will blink near Numeric Button. Paste the below code between open and close bracket :

private void decMouseClicked(java.awt.event.MouseEvent evt) {
str = str +".";
display.setText(str);
}

4) On double click on (/,x,+,-) Button, Source Code Page will open and Cursor will blink near Numeric Button. Paste the below code between open and close bracket according to arithmetic operation:

For Button ÷ :-
private void divMouseClicked(java.awt.event.MouseEvent evt) {   
         value1 = Double.parseDouble(str);
        opera =1;
        str = str + "/";
        int n = str.length();
        id = n;
        display.setText(str);
    }                                

For Button X :-
    private void mulMouseClicked(java.awt.event.MouseEvent evt) {   
         value1 = Double.parseDouble(str);
        opera =2;
        str = str + "X";
        int n = str.length();
        id = n;
        display.setText(str);
    }

For Buttton + :-
private void addMouseClicked(java.awt.event.MouseEvent evt) {       
        value1 = Double.parseDouble(str);
        opera =3;
        str = str + "+";
        int n = str.length();
        id = n;
        display.setText(str);
    }

For Button - :-
private void subMouseClicked(java.awt.event.MouseEvent evt) {      
         value1 = Double.parseDouble(str);
        opera =4;
        str = str + "-";
        int n = str.length();
        id = n;
        display.setText(str);
    }

5) On double click on (<-,C,=) Button, Source Code Page will open and Cursor will blink near Numeric Button. Paste the below code between open and close bracket:

For Button <- : -
private void delMouseClicked(java.awt.event.MouseEvent evt) {                                 
        // TODO add your handling code here:
       
        str = str.substring(0,str.length()-1);
        display.setText(str);      
    }  

For Button C :-
private void clearMouseClicked(java.awt.event.MouseEvent evt) {                                   
        // TODO add your handling code here:
        str ="";
        display.setText("0");
    }   

For Button = :-
private void equalMouseClicked(java.awt.event.MouseEvent evt) {                                   
        // TODO add your handling code here:
        String str1 = str.substring(id,str.length());
        value2 = Double.parseDouble(str1);
        
        double res=0;
        switch(opera)
        {
            case 1:
             res = value1/value2;
             break;
            case 2:
             res = value1*value2; 
             break;
            case 3:
             res = value1+value2;
             break;
            case 4:
             res = value1-value2;   
             break;
        }
     
        str = String.valueOf(res);
        display.setText(str);
       // str="";
    }

Output :-

Download full code for Simple Calculator Application using java swing

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