public class Student{
    private String name;
    private long id;
    private String sex;
    private int age;
    
    public Student(String name, long id, String sex, int age){
        this.name = name;
        this.id = id;
        this.sex = sex;
        this.age = age;
    }

    public void setAge(int age){
        this.age = age;
    }

    public String getName(){
        return name;
    }
    public long getId(){
        return id;
    }
    public String getSex(){
        return sex;
    }
    public int getAge(){
        return age;
    }
    
    public static void main(String[] args){
        Student[] students = new Student[3]; 
        students[0] = new Student("张三",20200909,"男",18);
        students[1] = new Student("李四",20200910,"女",19);
        students[2] = new Student("王五",20200911,"女",17);
        for(Student student : students){
            System.out.print("原信息：");
            System.out.println(student.getName() + " " + student.getId() + " " + student.getSex() + " " + student.getAge());
            student.setAge(20);
            System.out.print("修改后: ");
            System.out.println(student.getName() + " " + student.getId() + " " + student.getSex() + " " + student.getAge());
        }
    }
    
}