自动生成 POJO 时 boolean(Boolean) 域的问题

public class HelloPojo {

    private String name;

    private boolean isMale;

    private Boolean isOld;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public boolean isMale() {

        return isMale;

    }

    public void setMale(boolean isMale) {

        this.isMale = isMale;

    }

    public Boolean getIsOld() {

        return isOld;

    }

    public void setIsOld(Boolean isOld) {

        this.isOld = isOld;

    }

}

    private boolean isMale;

    public boolean getIsMale() {

        return isMale;

    }

    public void setIsMale(boolean isMale) {

        this.isMale = isMale;

    }