求解Java问题，求解一下

public class Person {

public static void main(String[] args) throws Exception {
    Person person = new Person("张三","男",20);
    System.out.println(person) ;
}

private String name = "";
protected String gradel="";
int age = 0;

public Person() {

}

public Person(String name, String gradel, int age) throws Exception {
    if (!("男".equals(gradel) || "女".equals(gradel))) {
        throw new Exception("性别只能是男或者女");
    }
    if (age < 0 || age > 130) {
        throw new Exception("年龄超过范围");
    }
    this.name = name;

    this.gradel = gradel;
    this.age = age;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getGradel() {
    return gradel;
}

public void setGradel(String gradel) {
    this.gradel = gradel;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

@Override
public String toString() {
    return "Person{" +
            "name='" + name + '\'' +
            ", gradel='" + gradel + '\'' +
            ", age=" + age +
            '}';
}

}

你是哪个地方有问题呢？哪一步做不下去？

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