用JAVA编写一个学生类student,包含的属性有学号、姓名、年龄，将所有学生存储在一个数组里，自拟数据，用数据的初始化方法给数组赋值，并实现如下操作。

下面是JAVA代码实现：

public class Student {
    private int id;
    private String name;
    private int age;
    
    public Student(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    
    public int getId() {
        return id;
    }
    
    public void setId(int id) {
        this.id = id;
    }
    
    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 class Main {
    public static void main(String[] args) {
        Student[] students = {new Student(1, "Tom", 18), 
                              new Student(2, "Jerry", 19), 
                              new Student(3, "Mike", 20)};
        
        // 1.输出所有学生的信息
        for (Student student : students) {
            System.out.println(student.getId() + "\t" + student.getName() + "\t" + student.getAge());
        }
        
        // 2.查询学号为2的学生信息
        for (Student student : students) {
            if (student.getId() == 2) {
                System.out.println(student.getId() + "\t" + student.getName() + "\t" + student.getAge());
            }
        }
        
        // 3.查询年龄大于等于19的学生信息
        for (Student student : students) {
            if (student.getAge() >= 19) {
                System.out.println(student.getId() + "\t" + student.getName() + "\t" + student.getAge());
            }
        }
    }
}

输出结果如下：

1	Tom	18
2	Jerry	19
3	Mike	20
2	Jerry	19
2	Jerry	19
3	Mike	20