this和判断的位置对赋值的要求

package charter01;

public class Person {
private String name;
private int age;

public String getName() {
return name;
}

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

public int getAge() {
return age;
}

public void setAge(int age) {
// 判断里面如果不写age=0,就要放在this上面.相当于不赋值,如果不写相当于int的默认值是0,
this.age = age;
// 如果写在this下面就要age=0,
if (age < 0 || age > 130) {
System.out.println("您输入的年龄不符合常理");
// 如果不写,就要放在this上面.相当于不赋值,如果不写相当于int的默认值是0,
this.age = 0;//相当于在这里做判断，超出年龄范围的都把this.age赋值0

}

public Person(String name, int age) {
super();
this.name = name;
this.age = age;
if (age < 0 || age > 130) {
System.out.println("您输入的年龄不符合常理");

 相当于在这里做判断，超出年龄范围的都把this.age赋值0

this.age = 0;
}
}

@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + "]";
}

@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}

@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Person other = (Person) obj;
if (age != other.age)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}

}