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public class User { public String name; public String password; }
public class User { private String name; private String password; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
public void setPassword(String password) { if (password == null) { throw new IllegalArgumentException("invalid password"); } this.password = password; }
class Admin extends User { @Override public void setName(String name) { super.setName(name + "Admin"); } }
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