2021-3-21 初识Java

Myth丶恋晨 2022-11-12 01:45 11阅读 0赞

## 标题2021年第一次接触Java ##

***java老师布置的第一次作业***

package cn.jc.output;
    
    public class Twochapter { 
    	public static void main(String[] args){ 
    	//课堂练习题：P21案例
    		int wangScore=80;
    		int zhangScore=wangScore+15;
    		System.out.println("张萌的Java:"+zhangScore);
    		
    		//运算符“+”的延伸知识
    		int a=10;
    		int b=100;
    		System.out.println("a+b="+(a+b));
    		
    		//课堂练习题：P22-P23案例和示例3
    		int com=85;
    		int javascore=97;
    		int MySQL=93;
    		double avg=(com+javascore+MySQL)/3;
    		int diffen=javascore-MySQL;
    		System.out.println("-------------------------------");
    		System.out.println("计算机基础\tjava\tMySQL");
    		System.out.println(com+"\t"+"\t"+javascore+"\t"+MySQL);
    		System.out.println("-------------------------------");
    		System.out.println("java和MySQL的分数差："+diffen);
    		System.out.println("平均分："+avg);
    		System.out.println("\n");
    		
    //数据类型转换 P23
    		//1.自动数据类型转换
    		int score = 8;
    		double newScore = score;
    		System.out.println(newScore);
    		//2.强制数据类型转换
    		double pi = 3.14;
    		int ji = (int)pi;
    		System.out.println(ji);
    		
    //关系运算符 P23
    		//案例4
    		int zhanScore=90;
    		int liScore=80;
    		boolean isHeight=zhanScore>liScore;
    		boolean issame=zhanScore==liScore;
    		System.out.println("张三的成绩比李四的成绩高吗："+isHeight);
    		System.out.println("张三的成绩和李四的成绩是否相等："+issame);
    		System.out.println("\n");
    		
    	//第二单元的课后作业
    		
    		//1.(课上练习)
    		System.out.println("------------消费单------------");
    		System.out.println("商品名称\t商品单价\t个数\t金额");
    		int shirt = 246;
    		int shirtnumber = 2;
    		int shoe = 570;
    		int shoenumber = 1;
    		int racket = 320;
    		int racketnumber = 1;
    		double num;
    		num = (int)(shirt*shirtnumber+shoe*shoenumber+racket*racketnumber)*0.8;
    		System.out.println("T恤\t"+shirt+"\t"+shirtnumber+"\t"+shirt*shirtnumber);
    		System.out.println("网球鞋\t"+shoe+"\t"+shoenumber+"\t"+shoe*shoenumber);
    		System.out.println("网球拍\t"+racket+"\t"+racketnumber+"\t"+racket*racketnumber);
    		System.out.println("消费总金额："+num);
    		System.out.println("\n");
    		
    		
    		//2.(变量值的交换)------技巧：[利用第三个变量达到变量值的交换]
    		int left = 10;
    		int right = 8;
    		int  added;
    		System.out.println("输出互换前手中的纸牌：");
    		System.out.println("左手的纸牌："+left);
    		System.out.println("右手的纸牌："+right);
    		added = left;
    		left = right;
    		right = added;
    		System.out.println("输出互换后手中的纸牌：");
    		System.out.println("左手的纸牌："+left);
    		System.out.println("右手的纸牌："+added);
    		System.out.println("\n");
    		
    		
    		//3. 2.4自助取款机-欢迎界面 P25
    /* ----设置用戶名，密码及账号余额 * String Administrator = "shaolei"; int password = 1234567890; double mony = 520; */
    		//基本信息
    		System.out.println("**************************************");
    		System.out.println("\t欢迎登陆前程ATM系统\n");
    		System.out.println("\t1.查询\n"+"\t2.存款\n"+"\t3.取款\n"+"\t4.修改密码\n"+"\t5.退出\n");
    		System.out.println("**************************************");
    	}
    }

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## 我们学校的落日风景 ##

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