This Example will teach you how to make the Calculator programming in java step by step in right way. this is the professional way to do the calculation part.
First Step Create the Variable
int operation;
public void getSum(int operation) { if(txtNum1.getText().length()!=0 && txtNum2.getText().length()!=0) { switch(operation) { case 1: txtResult.setText(""+(Double.parseDouble(txtNum1.getText())+Double.parseDouble(txtNum2.getText()))); break; case 2: txtResult.setText(""+(Double.parseDouble(txtNum1.getText())-Double.parseDouble(txtNum2.getText()))); break; case 3: txtResult.setText(""+(Double.parseDouble(txtNum1.getText())*Double.parseDouble(txtNum2.getText()))); break; case 4: txtResult.setText(""+(Double.parseDouble(txtNum1.getText())/Double.parseDouble(txtNum2.getText()))); break; } } }
Paste the Code side the + Button
operation=1; means go to check case 1
operation=1; getSum(operation);
Paste the Code side the – Button
operation=2; means go to check case 2
operation=2; getSum(operation);
Paste the Code side the * Button
operation=3; means go to check case 3
operation=3; getSum(operation);
Paste the Code side the / Button
operation=4; means go to check case 4
operation=4; getSum(operation);
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