定義一個User類，包括：數(shù)據(jù)成員——用戶名、密碼；方法成員——身份驗證、修改密碼。用Java怎么編寫，思路也行
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public?class?User?{
????private?String?username;
????private?String?password;
????public?User(String?username,?String?password)?{
????????this.username?=?username;
????????this.password?=?password;
????}
????public?boolean?identify(String?username,?String?password)?{
????????return?(this.username.equals(username))?&&?(this.password.equals(password));
????}
????public?String?modifyPassword(String?oldPassword,?String?newPassword)?{
????????String?tip;
????????if?(this.password.equals(oldPassword))?{
????????????this.password?=?newPassword;
????????????tip?=?"密碼修改成功";
????????}?else?{
????????????tip?=?"密碼修改失敗";
????????}
????????return?tip;
????}
????public?String?getPassword()?{
????????return?this.password;
????}
????public?String?getUsername()?{
????????return?this.username;
????}
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