java - How to Auto Subtract input values of JText Field in swing -

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this question has answer here:

i want auto subtract jtextinput value , want subtracted value in text field

q. how can achieve this?

here jtextfield code:

public class showdata1 extends jframe { public showdata1()   {   this.setdefaultcloseoperation(jframe.dispose_on_close); container c = getcontentpane();   c.setlayout( new flowlayout());     //  setundecorated(true);       dimension screensize = toolkit.getdefaulttoolkit().getscreensize();       setbounds(0,0,screensize.width, screensize.height);         opening_km= new jlabel("opening km");        opening_km.setbounds(0,280,258,30);        opening_km.setfont(new java.awt.font("times new roman", 1,25)); // noi18n        c.add(opening_km);         opening_kms= new jtextfield("");        opening_kms.setbounds(200,280,258,30);        opening_kms.setfont(new java.awt.font("times new roman", 1,25)); // noi18n        c.add(opening_kms);         closing_km= new jlabel("closing km");        closing_km.setbounds(500,280,258,30);        closing_km.setfont(new java.awt.font("times new roman", 1,25)); // noi18n        c.add(closing_km);         closing_kms= new jtextfield("");        closing_kms.setbounds(700,280,258,30);        closing_kms.setfont(new java.awt.font("times new roman", 1,25)); // noi18n        c.add(closing_kms);         totalkm= new jlabel("total km");        totalkm.setbounds(0,330,258,30);        totalkm.setfont(new java.awt.font("times new roman", 1,25)); // noi18n        c.add(totalkm);         totalkms= new jtextfield("");        totalkms.setbounds(200,330,258,30);        totalkms.setfont(new java.awt.font("times new roman", 1,25)); // noi18n        c.add(totalkms);  setlayout(null);   }    public static void main( string[] args )   {       final showdata1 frame = new showdata1();       frame.setvisible(true);  } }

try this..

int val = integer.parseint(textfield1.gettext()) - integer.parseint(textfield2.gettext());

for more please refer https://docs.oracle.com/javase/tutorial/java/data/converting.html

create class this..

public class mytextfield extends jtextfield {     // whaterver want...     public integer getvalue(){         if(gettext().length()  == 0)             return 0;         return integer.parseint(gettext());     } }

then can int value call getvalue() method


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