实例化一个Person 然后要求用户输入用户名
和年龄 并加以验证
名字至少一个字符 否则输出 姓名不能为空
年龄必须是0到100之间的数字 否则输出年龄不合法
都输入正确时最后输出该用户信息
public class Test05 {
}
class Person{
private String name
private int age
}
错误是缺少属性的初始化，比如 name 和 age 都没有初始化，同时 Person 类也没有无参构造器。
以下是修改后的代码：
import java.util.Scanner;
public class Test05 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
Person person = new Person();
System.out.print("请输入姓名：");
String name = scanner.nextLine();
if (name.length() == 0) {
System.out.println("姓名不能为空");
return;
}
person.setName(name);
System.out.print("请输入年龄：");
int age = scanner.nextInt();
if (age < 0 || age > 100) {
System.out.println("年龄不合法");
return;
}
person.setAge(age);
System.out.println("该用户信息如下：");
System.out.println("姓名：" + person.getName());
System.out.println("年龄：" + person.getAge());
}
}
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) {
this.age = age;
}
}
有用请采纳，点击右侧采纳即可：
import java.util.Scanner;
public class Test05 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
Person person = new Person();
System.out.print("Enter name: ");
String name = input.nextLine();
if (name.length() == 0) {
System.out.println("Name cannot be empty.");
return;
}
person.setName(name);
System.out.print("Enter age: ");
int age = input.nextInt();
if (age < 0 || age > 100) {
System.out.println("Age is not valid.");
return;
}
person.setAge(age);
System.out.println("User information: ");
System.out.println("Name: " + person.getName());
System.out.println("Age: " + person.getAge());
}
}
class Person {
private String name;
private int age;
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setAge(int age) {
this.age = age;
}
public int getAge() {
return age;
}
}