Decimal To Binary Converter Without Using Predefined Methods (Java)

This simple Java Application will convert the given decimal value to its Binary.

Following code is to be executed after the user enters a value and presses 'Convert'.

(Button Action)

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        int num = Integer.parseInt(jTextField1.getText());
        
        if(num>=0){
           int binary[] = new int[50];
           int index = 0;

           do{
               binary[index++]=num%2;
               num = num/2;
           }
           while(num>0);
       
           StringBuilder builder = new StringBuilder();
           for (int i=index-1; i>=0;i--) {
             builder.append(binary[i]);//to concatenate the array in reverse
           }
           String text = builder.toString(); // convert to string
           jLabel3.setText(text);
       }  
}