Can someone help me with an 'if' statement?

I got a code that inserts value from jTextField into my database:

Code:

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try {
          String sql = "INSERT into Sablonas (sablono_pav) values (?)";
          pst = conn.prepareStatement(sql);
          pst.setString(1, treciaspanelsablonopavTextField.getText());
          pst.execute();
          treciaspanelinfoLabel.setText("Pranesimas sėkmingai išsaugotas");
        } catch (Exception e) {
          JOptionPane.showMessageDialog(null, e); 
        }

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Can someone help me write an IF statement to check if that field is empty?

Something like this

Code:

---

if ( treciaspanelsablonopavTextField != "") {
try {
          String sql = "INSERT into Sablonas (sablono_pav) values (?)";
          pst = conn.prepareStatement(sql);
          pst.setString(1, treciaspanelsablonopavTextField.getText());
          pst.execute();
          treciaspanelinfoLabel.setText("Pranesimas sėkmingai išsaugotas");
        } catch (Exception e) {
          JOptionPane.showMessageDialog(null, e); 
        }
} else {

}

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Also, if i have multiple fields, can i write something like this?

Code:

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if (jTextField1 || jTextfield2 ||jTextField3 != "" {

} else {
}

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String has an isEmpty method.
So just check the String returned by getText().

And no, you have to check each one, so:

Code:

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if (jTextField.getText().isEmpty() || jTextField2.getText().isEmpty()) etc etc

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Thank you.
Also maybe you can help me with this - what if i have a field that only numbers can be written in it? is there something similar like isEmpty? like isNumeric or isNotNumeric?

You can construct a java.utl.Scanner with the text String and query its hasNextXxx() methods. You can also use a JFormattedTextField or write a DocumentFilter for a JTextField's Document to ensure that only digits can be entered (and maybe a single decimal point, if you're dealing with floating point numeric types).

db

Quote:

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Originally Posted by DarrylBurke

You can construct a java.utl.Scanner with the text String and query its hasNextXxx() methods. You can also use a JFormattedTextField or write a DocumentFilter for a JTextField's Document to ensure that only digits can be entered (and maybe a single decimal point, if you're dealing with floating point numeric types).

db

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Thanks, ill look into this