在不使用客户端验证的情况下防止Age的负数

Question

我在Core java中有一个问题.考虑具有名为age的属性的Employee类.

class Employee{           
      private int age;     
      public void setAge(int age);     
}

我的问题是我如何限制/阻止setAge(int age)方法使得它只接受正数并且它不应该允许负数,

Note: This has to be done without using client side validation.how do i achieve it using Java/server side Validation only.The validation for age attribute should be handled such that no exception is thrown

Answer 1

您只需在方法中验证用户的输入:

public void setAge(int age) {
    if (age < 0) 
        throw new IllegalArgumentException("Age cannot be negative.");
    // setter logic
}

如果您不能抛出异常,那么您可能想尝试:

public boolean setAge(int ageP) {
    // if our age param is negative, set age to 0
    if (ageP < 0) 
        this.age = 0
    else 
        this.age = ageP;
    // return true if value was good (greater than 1) 
    // and false if the value was bad
    return ageP >= 0;
}

您可以返回该值是否有效.