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Java语言实例

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猜数字小游戏

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package com.demo;

import java.util.Scanner;

public class Test   {
    public static void main(String[] args){
        //获得1至100的随机数
        int number = (int)(Math.random()*100+1);
        //输出要求
        System.out.println("给你一个1至100之间的整数，请猜测这个数");
        System.out.print("输入您的猜测：");
        Scanner input = new Scanner(System.in);
        //循环判断
        boolean x = false;
        do {
            //获得用户数据
            int guess = input.nextInt();
            //判断数据大小
            if (guess > number) {
                System.out.print("猜大了，再输入你的猜测:");
            } else if (guess < number) {
                System.out.print("猜小了，再输入你的猜测:");
            } else {
                System.out.print("猜对了！");
                x = true;
            }
        }while(!x);
    }
}

评定学生成绩等级

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package com.demo;

import java.util.Scanner;

public class Test3 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入一个分数：");
        double score = input.nextDouble();
        if (score >= 90 && score <= 100) {
            System.out.println("优秀");
        } else if (score >= 80 && score < 90) {
            System.out.println("良好");
        } else if (score >= 70 && score < 80) {
            System.out.println("中等");
        } else if (score >= 60 && score < 70) {
            System.out.println("及格");
        } else if (score >= 0 && score < 60) {
            System.out.println("不及格");
        }else {
            System.out.println("超出范围");
        }
    }
}

读取用户输入的数，并判断结果

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package com.demo;

import java.util.Scanner;

public class Test2 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入x：");
        double x = input.nextDouble();
        if (x<-2){
            System.out.println("y=-2");
        } else if (x>=-2&&x<2){
            System.out.print("y=");
            System.out.print(x+3);
        } else if (x>=2) {
            System.out.println("y=3");
        }
    }
}

简易计算器

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package com.demo;

import java.util.Scanner;

public class Test {
    public static void main(String args[]){
        boolean bool = true;
        //循环判断结果
        while(bool) {
            //获取用户数据
            Scanner input = new Scanner(System.in);
            System.out.println("请输入第一个数：");
            double input1 = input.nextDouble();
            System.out.println("请输入第二个数：");
            double input2 = input.nextDouble();
            System.out.println("请输入运算符(+、-、*、/)：");
            char Calculate = input.next().charAt(0);
            double output = 0;
            //计算用户数据
            switch(Calculate){
                case '+':
                    output = input1 + input2;
                    break;
                case '-':
                    output = input1 - input2;
                    break;
                case '*':
                    output = input1 * input2;
                    break;
                case '/':
                    output = input1 / input2;
                    break;
                default:
                    System.out.println("请输入正确的符号");
            }
            //输出数据
            System.out.println("结果是：" + input1 + Calculate + input2 + "=" + output);
            //判断是否结束循环
            System.out.println("请问要退出吗？y/n");
            char result = input.next().charAt(0);
            if(result == 'y') {
                System.out.println("程序结束！");
                bool = false;
            }else if(result == 'n'){
                bool = true;
            }
        }
    }
}

银行管理

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package com.demo;

import java.util.*;
 //银行账户类
class Cust {
    //创建姓名，账号，密码，余额，流水号，开户总数，银行名称变量
    private String name;
    private int id;
    private String pwd;
    private int balance;
    int selfNum;
    static String bankName = "建设银行";
    static int allNum = 0;
    public Cust(){}//无参构造函数定义

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public int getId() {
         return id;
     }

     public void setId(int id) {
         this.id = id;
     }

     public String getPwd() {
         return pwd;
     }

     public void setPwd(String pwd) {
         this.pwd = pwd;
     }

     public int getBalance() {
         return balance;
     }

     public void setBalance(int balance) {
         this.balance = balance;
     }

     public Cust(String name, int id, String pwd, int balance) {
        this.name = name;
        this.id = id;
        this.pwd = pwd;
        this.balance = balance;
        allNum++;
        selfNum = allNum;
    }//构造成员

    public void getMoney(int price) {
        if (price > 0) {
            if (price <= balance) {
                this.balance -= price;
                System.out.println("成功取款" + price + "元\n");
            } else {
                System.out.println("余额不足！");
            }
        } else {
            System.out.println("金额非法");
        }
    }//取钱

    public void saveMoney(int price) {
        if (price > 0) {
            this.balance += price;
            System.out.println("成功存款" + price + "元\n");
        } else {
            System.out.println("金额非法");
        }
    }//存钱

    public void search() {
        System.out.println("所属银行：" + bankName);
        System.out.println("用户姓名：" + name);
        System.out.println("用户账号：" + id);
        System.out.println("账户余额：" + balance);
        System.out.println("您是本银行" + allNum + "个顾客中的第" + selfNum + "个顾客\n");
    }//输出

    public void changePWD() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请从键盘上键入新密码");
        String password = scanner.nextLine();
        if (password.equals(pwd)) {
            System.out.println("输入的密码不能与原密码相同\n");
        } else {
            this.pwd = password;
            System.out.println("修改成功\n");
        }
    }//修改密码

    public static double sum(Cust... c) {
        double sum = 0;
        for (int i = 0; i < allNum; i++) {
            sum += c[i].balance;
        }
        return sum;
    }//求和

    public static void sort(Cust... c) {
        Cust temp;
        for (int i = 0; i < allNum - 1; i++) {
            for (int j = 0; j < allNum - i - 1; j++) {
                if (c[j].balance < c[j + 1].balance) {
                    temp = c[j];
                    c[j] = c[j + 1];
                    c[j + 1] = temp;
                }
            }
        }
        for (int i = 0; i < allNum; i++) {
            System.out.println(c[i].name + "," + c[i].id + "," + c[i].balance);
        }
    }//排序
}
//VIP账户类
class VIPCust extends Cust{
    private static int overdraftLimit = 3000;//透支最大额度
    public VIPCust(String name, int id, String pwd, int balance) {
        super(name,id,pwd,balance);
    }//重构成员
    @Override
    public void getMoney(int price) {
        if(this.getBalance() +overdraftLimit>price){
            super.getMoney(price);
        } else  {
            System.out.println("余额不足，无法取款");
        }
    }//重构getMoney()函数
    public void transfer(Cust recipient,int price)
    {
        if(this.getBalance()+overdraftLimit>=price){
            recipient.setBalance(recipient.getBalance()+price);
            this.setBalance(this.getBalance()-price);
            System.out.println("成功转账"+price+"元\n");
        }else {
            System.out.println("余额不足，转账失败");
        }
    }
}
public class Test {
    public static void main(String[] args) {
        //预加载数据
        Cust Customer1 = new Cust("李四",100,"123456",10000);
        Cust Customer2 = new Cust("张三",105,"114514",9000);
        Cust Customer3 = new Cust("优秀素质",101,"1919810",5000);
        VIPCust VIP_Customer1 = new VIPCust("伍佰",1,"233333",50000);
        VIPCust VIP_Customer2 = new VIPCust("阿陈",2,"122222",30000);
        //显示数据
        Customer1.search();
        Customer2.search();
        Customer3.search();
        VIP_Customer1.search();
        VIP_Customer2.search();
        //测试操作
        Customer1.changePWD();
        Customer2.getMoney(2000);
        Customer3.saveMoney(3000);
        VIP_Customer1.transfer(VIP_Customer2,5000);
        VIP_Customer2.transfer(Customer1,1000);
        //按余额多少从上到下排序并输出
        Cust.sort(Customer1,Customer2,Customer3,VIP_Customer1,VIP_Customer2);
        //计算余额总量
        double sum = Cust.sum(Customer1,Customer2,Customer3,VIP_Customer1,VIP_Customer2);
        System.out.println("\n所有账户余额为"+sum);
    }
}

学生信息

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package com.student;

public class Student {
    private int no;
    private String name;
    private int age;
    private String address;
    private static int count = 0;

    public Student(int sno, String sname, int sage, String saddress) {
        this.no = sno;
        this.name = sname;
        this.age = sage;
        this.address = saddress;
        count++;
    }

    public int getNo() {
        return no;
    }

    public void setNo(int no) {
        this.no = no;
    }

    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 String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String toString() {
        return "学号：" + no + "，姓名：" + name + "，年龄：" + age + "，地址：" + address;
    }

    public static void main(String[] args) {
        Student student1 = new Student(1, "张三", 20, "上海");
        Student student2 = new Student(2, "李四", 22, "四川");
        Student student3 = new Student(3, "赵六", 21, "重庆");

        System.out.println("学生1的信息：" + student1.toString());
        System.out.println("学生2的信息：" + student2.toString());
        System.out.println("学生3的信息：" + student3.toString());
        System.out.println("学生数：" + count);
    }
}

分析大小写

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package com.analyze;
import java.util.*;
import java.lang.Character;

public class Analyze {

	public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int upper = 0;
        int lower = 0;
        int digit = 0;
        int space = 0;
        System.out.print("请输入字符串：");
        String input = scanner.nextLine();
        for (int i = 0; i < input.length(); i++) {
            char c = input.charAt(i);
            if (Character.isUpperCase(c)) {
                upper++;
            } else if (Character.isLowerCase(c)) {
                lower++;
            } else if (Character.isDigit(c)) {
                digit++;
            } else if (Character.isSpaceChar(c)) {
                space++;
            }
        }
        System.out.println("大写字母个数："+upper);
        System.out.println("小写字母个数："+lower);
        System.out.println("数字个数："+digit);
        System.out.println("空格个数："+space);
    }
}

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