已有超类Student:
public class Student{
public Student(String name, int id){
st_name=name;
st_id=id;
}
public void display(){
System.out.println("name is "+st_name+" id is "+st_id);
}
编写main(),在其中定义数组 Student[]
arr_stu,实现方法public void
display()的调用
public class Student{
public Student(String name, int id){
st_name=name;
st_id=id;
}
public void display(){
System.out.println("name is "+st_name+" id is "+st_id);
}
编写main(),在其中定义数组 Student[]
arr_stu,实现方法public void
display()的调用
private int st_id;
private String st_name;
public Student(String name, int id){
st_name=name;
st_id=id;
}
public void display(){
System.out.println( "name is "+st_name+ " id is "+st_id);
public static void main(String[] args) {
Student student;
student = new Student("zhu",98);
student.display();
}
}
没有定义数组!
这样写 正确!!!class Student
{
private int st_id;
private String st_name;
public Student(String name, int id)
{
st_name=name;
st_id=id;
}
public void display()
{
System.out.println( "name is "+st_name+ " id is "+st_id);
}
}
public class Binhaer{
public static void main(String[] args) {
Student student;
student = new Student( "zhu ",98);
student.display();
}
}