思路分析:
使用線程可以做動態效果, 逐步發生改變, 就是動態的了
效果如圖
參考代碼 ,可以在此基礎上進行改造
import?java.awt.event.*;
import?javax.swing.*;
public?class?FrameDemo?extends?JFrame?implements?ActionListener?{
JButton?jb;
public?FrameDemo()?{
jb?=?new?JButton("<<靜夜思>>");
jb.addActionListener(this);
JPanel?jp?=?new?JPanel();
jp.add(jb);
add(jp);
//?窗口屬性的設置
setTitle("Frame窗口");//?標題
setSize(256,?100);//?窗口大小
setLocationRelativeTo(null);//?窗口居中
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public?static?void?main(String[]?args)?{
new?FrameDemo().setVisible(true);//?創建窗口實例,?並讓窗口可見
}
@Override
public?void?actionPerformed(ActionEvent?e)?{
//?計算彈出框的位置
int?x?=?jb.getLocationOnScreen().x?+?jb.getWidth()?/?2?-?100;
int?y?=?jb.getLocationOnScreen().y?+?jb.getHeight();
MyDialog?md?=?new?MyDialog(x,?y);
Thread?t?=?new?Thread(new?Runnable()?{
@Override
public?void?run()?{
for?(int?i?=?40;?i?<?200;?i?+=?2)?{
md.setSize(200,?i);
try?{
Thread.sleep(100);
}?catch?(InterruptedException?e)?{
e.printStackTrace();
}
}
}
});
t.start();//啟動線程
}
}
class?MyDialog?extends?JDialog?{
public?MyDialog(int?x,?int?y)?{
setTitle("靜夜思");
JLabel?jl?=?new?JLabel("<html><body>床前明月光,疑是地上霜.<br?/>舉頭望明月,低頭思故鄉.<br?/></div></body></html>");
add(jl);
setSize(200,?40);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setLocation(x,?y);
setVisible(true);
setAlwaysOnTop(true);
}
}