一个JAVA练习题，我是小白，刚刚接触JAVA，求指导

class student{
public String name;
public int age;
public int No;
public void sayMyName(){
System.out.println("我的名字叫："+name);
}
public void study(){
System.out.println("我正在学习java");
}
}

public class Student{
 public String name;
 public int age;
 public String no;
 
 public void sayMyName() {
  System.out.println("我会叫：" + name);
 }

 public void study() {
  System.out.println("我正在学习JAVA");
 }
}

希望能帮到你

public class Student {
	public String name;
	public Integer age;
	public String no;
  
	public void sayMyName(){
		System.out.println("我会叫"+name);
	}
	public void study(){
		System.out.println("我正在学习java");
	}
  
	public static void main(String[] args){
		Student s = new Student();
		s.name = "张三";
		s.sayMyName();
		s.study();
	}
}
结果
我会叫张三
我正在学习java

public class Student {

public String name;

public int age;

public int NO;

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;
}

public int getNO() {
return NO;
}

public void setNO(int nO) {
NO = nO;
}

public void sayMyName(){
System.out.println("我会叫" + name);
}
public void study(){
System.out.println("我正在学习JAVA");
}
}

使用的是默认包
PS：我也是刚学习

public class Student {

public String name;
public int age;
public int no;

public Student(String name, int age, int no){
this.name = name;
this.age = age;
this.no = no;
}

public void sayMyName(){
System.out.println("我会叫" + name);
}

public void study(){
System.out.println("我正在学习JAVA");
}

public static void main(String[] args) {
Student student = new Student("小明", 18, 1001);
student.sayMyName();
student.study();
}
}