Java Swing - 从另一种方法设置 Jlabel 文本
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Java Swing - set Jlabel text from another method
提问by Bagshot
I'm pretty new to Java and Swing, and I'm using Windowbuilder to play around with a few GUI ideas I have, but I've run into a problem when trying to set the text of a Jlabel.
我对 Java 和 Swing 还很陌生，我正在使用 Windowbuilder 来尝试一些我拥有的 GUI 想法，但是在尝试设置 Jlabel 的文本时遇到了问题。
Windowbuilder has automatically created an instance of the Jlabel, called pathLabel, in the initialize() method like so:
Windowbuilder 在 initialize() 方法中自动创建了 Jlabel 的一个实例，称为 pathLabel，如下所示：
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 570, 393);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JLabel pathLabel = new JLabel("New label");
pathLabel.setBounds(61, 296, 414, 15);
frame.getContentPane().add(pathLabel);}
If I use pathLabel.setText("enter text here") from within this initialize() method, then it works fine, but how can I set text from a completely different method? It's not letting me reference it.
如果我在这个 initialize() 方法中使用 pathLabel.setText("enter text here")，那么它工作正常，但我如何从一个完全不同的方法设置文本？它不让我参考它。
I never had this problem in Visual Studio with C#, and was able to set the text of a label from any method I choose. What am I missing?
我在使用 C# 的 Visual Studio 中从未遇到过这个问题，并且能够通过我选择的任何方法设置标签的文本。我错过了什么？
I hope this makes sense, and I appreciate any help at all. Thanks.
我希望这是有道理的，我非常感谢任何帮助。谢谢。
采纳答案by mohit jain
You can put pathLabel as a instance variable in your class and access it across all the methods in the class.
您可以将 pathLabel 作为类中的实例变量，并在类中的所有方法中访问它。
class GUIClass extends JFrame{
JLabel pathLabel;
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 570, 393);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
pathLabel = new JLabel("New label");
pathLabel.setBounds(61, 296, 414, 15);
frame.getContentPane().add(pathLabel);
}
void func(){
pathLabel.setText("enter text here");
}
回答by Gabriel Gonzalez
You can create a field for pathLabel in the surrounding class so that all class methods can access it:
您可以在周围的类中为 pathLabel 创建一个字段，以便所有类方法都可以访问它：
class YourClass {
private JLabel pathLabel;
private void initialize() {
...
// Note that there is no declaration for pathLabel inside initialize
// since it was already declared above, and the above
// declaration is a reference shared by all class methods
pathLabel = new JLabel("New label");
...}
}
