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我有一個空類MyJTextField延伸的JTextField,我想MyJTextField被初始化爲JPasswordField中,喜歡的JTextField可以做。爲什麼擴展JTextField的類不能實例化一個JPasswordField?
JTextField pass = new JPasswordField(); //no errors
but
MyJTextField pass = new JPasswordField();//"Type mismatch: cannot convert from JPasswordField to MyJTextField"
Thx,沒有意識到。 :/ – tomyforever