有关java类的几个练习

1、定义一个类Book，具有属性：书名，价格。功能：设置和获取书的价格，书的名字

package Test;
import java.util.Arrays;
public class Book {
   private String name;
   private double price;
   void get(){
       System.out.print("书名:"+name+",价格:"+price+"");
   }
   public void setPrice(double a){
       price=a;
   }
   public double getPrice(){
       return price;
   }
   public void setName(String b){
       name=b;
   }
   public String getName(){
       return name;
   }
}

public class Exerse1{
   public static void main(String[] args){
       Book b=new Book();
       b.setName("平凡的世界");
       b.getName();
       b.setPrice(58);
       b.getPrice();
       b.get();
   }
}

2、编写一个学生类，提供name,age,phone,address,email成员变量。且为每一个成员变量提供相对应的get,set方法，为学生提供一个默认的构造器以及带有参数的构造器，为学生提供方法描述吃喝玩睡等行为。

package Test;

public class Student {
   private String name;
   private int age;
   private long phone;
   private String address;
   private String email;
   //构造方法有参
   public Student(String name, int age, long phone, String address, String email) {
       this.name = name;
       this.age = age;
       this.phone = phone;
       this.address = address;
       this.email = email;
   }
   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 long getPhone() {
       return phone;
   }
   public void setPhone(long phone) {
       this.phone = phone;
   }
   public String getAddress() {
       return address;
   }
   public void setAddress(String address) {
       this.address = address;
   }
   public String getEmail() {
       return email;
   }
   public void setEmail(String email) {
       this.email = email;
   }
   void eat(){
       System.out.println(name+"吃饭");
   }
}

public class Exerse1{
public static void main(String[] args){
Student b=new Student("zs",20,58119,"北京","673931");
b.eat();
}
}

3、在2的定义基础上，定义类，用来进行信息的查询功能，根据年龄进行排序

public class Exerse1{
   public static int getAge(Student[] arr,String name){
       int i=0;
       for(;i<arr.length;i++){
           if(arr[i].getName().equals("zs")){
               break;
           }
       }
       if(i==arr.length){
           return -1;
       }
       return arr[i].getAge();
   }
   //按年龄进行排序（从小到大）
   public static void sortArr(Student[] arr){
       if(arr[0].getAge()>arr[1].getAge()){
           Student temp=arr[0];
           arr[0]=arr[1];
           arr[1]=temp;
       }
   }
public static void main(String[] args){
   Student[] arr=new Student[2];
   arr[0]=new Student("zs",20,58119,"北京","673931");
   arr[1]=new Student("lisi",18,34558119,"北京","6255573931");
   sortArr(arr);
   for(int i=0;i<arr.length;i++){
           System.out.println(arr[i].getName()+" "+arr[i].getAge());
       }
   }
}

有关java类的几个练习

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