java 为什么我的 JFrame 不显示？
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Why is my JFrame not showing?
提问by Dave
I'm pretty sure I've done it this way before, but for some reason, the JFrame won't show up when I run it.
我很确定我以前这样做过，但是由于某种原因，当我运行它时 JFrame 不会出现。
JLabel originalString = new JLabel("Original String: "
+ str.getMutator());
JLabel currentString = new JLabel("Current String: "
+ str.getMutator());
JLabel finalString = new JLabel("Final String: " + str.getTarget());
JPanel panel = new JPanel();
panel.add(originalString);
panel.add(currentString);
panel.add(finalString);
JFrame frame = new JFrame("Mutating String!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
回答by Sheng Chien
Try to set size or check with the preferred size of your components probably because you call pack().
尝试设置大小或检查组件的首选大小，这可能是因为您调用了 pack()。
frame.setSize(x, y);
frame.setSize(x, y);
回答by Colin Hebert
Your problem must be somewhere else (is the method called does it throw an exception ?) because your code works (I commented the str calls) :
你的问题一定在其他地方（被调用的方法是否抛出异常？）因为你的代码有效（我评论了 str 调用）：
http://img217.imageshack.us/img217/902/screenvlg.png
http://img217.imageshack.us/img217/902/screenvlg.png
import javax.swing.*;
public class Test{
public static void main(String... args){
JLabel originalString = new JLabel("Original String: " /*+ str.getMutator()*/);
JLabel currentString = new JLabel("Current String: "/* + str.getMutator()*/);
JLabel finalString = new JLabel("Final String: " /* + str.getTarget()*/);
JPanel panel = new JPanel();
panel.add(originalString);
panel.add(currentString);
panel.add(finalString);
JFrame frame = new JFrame("Mutating String!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}
