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Person 方法重载

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public class Person {
    private String name;
    private String lastname;
    private String firstname;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
    public void setName(String lastname,String firstname) {
        this.name = lastname + " " + firstname;
    }
}



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