【Java笔记】类与对象练习题（打印个人信息，实现中英文切换；打印购物小票，实现商品信息、折扣、支付金额用户输入，输出计算的金额等完整信息）

1.打印个人信息，实现中英文切换

    代码实现：

class Person{
    private final String name;
    private String post;
    private final boolean sex;
    private int age;
    private String tel;
    private String adress;
	public Person(String name,boolean sex){
		this.name = name;
		this.sex = sex;
	}
	public String getName(){
		return this.name;
	}
	public boolean getSex(){
		return this.sex;
	}
	public void setPost(String post){
		this.post = post;
	}
	public String getPost(){
		return this.post;
	}
	public void setAge(int age){
		if(age>=0 && age <=120){
			this.age= age;
		}else{
			this.age= 0;
		}
	}
	public int getAge(){
		return this.age;
	}
	public String getTel(){
		return this.tel;
	}
	public void setTel(String tel){
		this.tel= tel;
	}
	public String getAdress(){
		return this.adress;
	}
	public void setAdress(String adress){
		this.adress= adress;
	}
	public void print(String name,String post,boolean sex,int age,String tel,String adress){
		System.out.print("Name:" +name+"\t");
		System.out.println("Post:" +post+"\t");
		if(sex == false){
			System.out.print("Sex:female" +"\t");
		}else{
			System.out.print("Sex:male" +"\t");
		}
		System.out.println("Age:" +age+"\t");
		System.out.print("Tel:" +tel+"\t");
		System.out.println("Adress:" +adress+"\t");
	}
}
class ChinesePerson extends Person{
	public ChinesePerson(String name,boolean sex){
		super(name,sex);	
	}
	public void print(String name,String post,boolean sex,int age,String tel,String adress){
		System.out.print("姓名:" +name+"\t");
		System.out.println("职位:" +post+"\t");
		if(sex == false){
			System.out.print("性别:女" +"\t");
		}else{
			System.out.print("性别:男" +"\t");
		}
		System.out.println("年龄:" +age+"\t");
		System.out.print("电话:" +tel+"\t");
		System.out.println("地址:" +adress+"\t");
	}
}
public class TestPerson{
	public static void main(String[] args){
		Person p;
		if(args.length == 1 && args[0].equals("en")){
			p = new Person("Mary",false);
			p.setPost("HR Director");
			p.setAdress("chaoyang,Beijing");
		}else{
			p = new ChinesePerson("玛丽",false);
			p.setPost("人力资源主管");
			p.setAdress("北京市朝阳路");
		}		
		p.setAge(26);
		p.setTel("18081318888");
		p.print(p.getName(),p.getPost(),p.getSex(),p.getAge(),p.getTel(),p.getAdress());
	}
}

运行结果：

2.打印购物小票

扩展:

1.商品信息用户输入      2.折扣通过用户输入       3.输出计算的金额
4.用户输入支付金额      5.输出完整信息

代码实现：

/*
打印购物小票：
1.商品信息用户输入
2.折扣通过用户输入
3.输入计算的金额
4.用户输入支付金额
5.输出完整信息
*/
import java.util.Scanner;

public class HomeWork{
	public static void main(String[] args){
		//1.订单
		Order order =  new Order();
		//2.商品
		Goods[] goodsArray = new Goods[3];
		order.setGoodsArray(goodsArray);
		System.out.println("请输入商品信息格式如下：");
		System.out.println("商品名称  商品价格  商品数量");
		Scanner sc = new Scanner(System.in);
		for(int i=0; i<3; i++){
			String line  = sc.nextLine();
			String[] segments = line.split(" ");
			goodsArray[i] = new Goods(segments[0],
			                          Double.parseDouble(segments[1]),
									  Integer.parseInt(segments[2])
									  );
		}
		
		//3.折扣
		System.out.println("请输入折扣 1-9数字");
		String dcPrint = sc.nextLine();
		order.setDiscount(Integer.parseInt(dcPrint));
		
		//4.计算金额
		Double totalPrice = order.getTotalPrice();
		System.out.println("总金额为：" + totalPrice );
		System.out.println("请输入支付金额：");
		String payPrint = sc.nextLine();
		order.setPay(Double.parseDouble(payPrint));
		
		//5.打印订单
		System.out.println(order);
	}
}
//订单
class Order{
	private Integer discount = 10;//折扣
	private Double pay;//支付
	private Goods[] goodsArray;//商品
	
	public void setDiscount(Integer discount){
		this.discount = discount;
	}
	
	public void setPay(Double pay){
		this.pay = pay;
	}
	
	public void setGoodsArray(Goods[] goodsArray){
		this.goodsArray = goodsArray;
	}
	//打折后的总金额
	public Double getTotalPrice(){
		Double total = 0.0;
		for(int i=0; i<goodsArray.length; i++){
			total += goodsArray[i].getTotalPrice();
		}
		return total * this.discount * 0.1D;
	}
	//找钱
	public Double getChange(){
		return this.pay - this.getTotalPrice();
	}
	public String toString(){
		StringBuilder sb = new StringBuilder();
		sb.append("***********消费单***********\n")
		  .append("名称\t单价\t数量\t金额\n");
		  for(int i=0; i<this.goodsArray.length; i++){
			  sb.append(this.goodsArray[i].toString()+"\n");
		  }
		  sb.append("\n")
		    .append("---------------------------\n")
			.append("折扣：").append( "￥"+this.discount).append("折\n")
			.append("消费总金额：").append("￥"+this.getTotalPrice()+"\n")
			.append("实际支付：").append("￥"+this.pay+"\n")
			.append("找零：").append("￥"+this.getChange()+"\n")
			.append("本次积分：").append(this.getTotalPrice()+"\n");
		return sb.toString();
	}
	
}
class Goods{
	private String name;
	private Double price;
	private Integer number;
	
	public Goods(String name,Double price,Integer number){
		this.name = name;
		this.price = price;
		this.number = number;
	}
	public Double getTotalPrice(){
		return this.number * this.price;
	}
	//覆写toString
	public String toString(){
		return this.name + "\t" + "￥" + this.price +"\t" 
		+this.number + "\t" + this.getTotalPrice();
	}
}

运行结果：