Java Check If Two JTextField Has The Same Content

Question

This question already has an answer here:

• How do I compare strings in Java? 23 answers

I have two JTextFields txf1 and txf2.

In both of them I input the same content (for example: "test").

I made and If statement:

if (txf1.getText() == txf2.getText()) {
    System.out.println("Equal");
} else {
    System.out.println("Error");
}

Why it prints out the error message? I even made a System.out.println(txf1.getText()) and System.out.println(txf2.getText()) and the same looks equal, but prints out the error message?

Answer 1

Use the equals method to compare Strings. == only compares the object reference. equals compares the actual content of the Strings.

Your code should be something like this:

if (txf1.getText().equals(txf2.getText())) {
  System.out.println("Equal");
} else {
  System.out.println("Error");
}

Answer 2

Also you can use this good practice which makes your text box entries efficient.

if (txf1.getText().trim().equals(txf2.getText().trim())) {

Answer 3

String comparison in Java is done using String#equals, using == means you are comparing the memory reference of the objects, which won't always return true when you think it should.

Try something more like....

if (txf1.getText().equals(txf2.getText())) {

...instead