如何在 Java 中创建 GUI 计算器？

Question

I am creating a Calculator GUI in java. So far I have created a layout and added everything to the canvas. I am now in the implementing phase. My current problem is that when I can not enter more than one-digit numbers. enter image description here

Answer 1

at numberbox.setText, instead of setting new value each time on button click, get existing value and append new value. old value = numberbox.getText; numberbox.setText(oldvalue+new value);

Answer 2

String text = numberBox.getText();
//Your Code Here
text += actionPerformed(e);
numberBox.setText(text);

You should try update text.

Answer 3

Normally, a simple calculator would have the characters they would like displayed within the Number Box as the actual caption on the button selected. This then means that all you need to append to the Number Box is the caption of the button selected. Knowing this greatly reduces the code contained within the actionPerformed event.

public void actionPerformed(ActionEvent e) {
    numberBox.setText(numberBox.getText() + ((JButton) e.getSource()).getText());
}

And that's all.