这两个代码有错吗 跑不起来

package test;

public class student1 {

    Private String id;
    Private String name;
    Private int age;
    
    public student1() {
        
    }
    
    public student1(String id, String name){
        this.id = id;
        this.name = name;
    }
        
    public student1(String id, String name, int age) {
        //this(id,name);
        //this.age = age;
        this(id,name);
        this.age = age;
    }
    
    public void setAge(int a) {
        if(a<18) a = 18;
        age = a; 
    }
    
    public int getAge() {
        return age;
    }
    
    void walk() {
        System.out.println("walking...");
    }
}

package test;

public class test1 {
    
    public static void main(String[]args ) {

    // TODO 自动生成的方法存根
    student1 s = new student1("09190501","Tom",19);
    //s.id = "09190501";
    //s.name = "Tom";
    //s.age = -18;
    //s.setage(10);
    //System.out.println(s.id);
    System.out.println(s.getAge());
    s.walk();
    
    student1 s1 = new student1();
    //s.id = "09190502";
    //s.name = "Lily";
    //System.out.println(s1.id);
    System.out.println(s1.getAge());
    

    }

}

类名大写，和文件名保持一致

啥叫跑不起来 , 贴一下错误信息呀