听课笔记（六）

小咪咪 2022-08-03 14:58 179阅读 0赞

1.test\_1 ( 面向对象 )

package com.jereh4;
    
    public class Test_8_10 {
    
        private String name = "";
        private int    age  = 0 ;
        private String   sex  = "";
        private int   high  = 0 ;
        private int  weight = 0 ;
    
        public Test_8_10(String name, int age , String sex){
    
            this.name = name;
            this.age  = age;
            this.sex  = sex; 
        }
    
        private static Test_8_10 test = new Test_8_10("小美", 21, "女");
    
        public static Test_8_10 getTest(){
            return test;
        }
    
        public void setName(String name){
            this.name = name;
        }
    
        public String getName(){
    
            return name;
        }
    
        public void setAge(int age){
    
            this.age = age;
        }
    
        public int getAge(){
    
            return age;
        }
    
        public void setSex(String sex){
    
            this.sex = sex;
        }
    
        public String getSex(){
    
            return sex;
        }
    
        public void sleep(){
    
            System.out.println("睡觉！");
        }
    
        public void say(){
    
            System.out.println("我叫"+name);
            System.out.println("我今年"+age+"岁了");
            System.out.println("我的性别是"+sex);
    
        }
    
    }

2.test\_2 ( I/O )

package com.jereh4;
    
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.FilenameFilter;
    import java.io.IOException;
    import java.util.regex.Pattern;
    
    public class Demo_8_10 { 
    
    
        public static void main(String[] args){
    
    // boolean b;
    // 
    // b = Pattern.matches("a*b", "aaaab");
    // 
    // Pattern p = Pattern.compile("a*b");
    // Matcher m = p.matcher("bbb");
    // b = m.matches();
    // 
    // System.out.println(b);
    // FilenameFilter f = new DirFilter(".txt");
            File file = new File("testBing.txt");
    // File[] f = new File();
    
    // String[] list;
    // try { 
    // System.out.println(file.createNewFile());
    // } catch (IOException e) { 
    // // TODO Auto-generated catch block
    // e.printStackTrace();
    // }
                System.out.println(file.canWrite());
    // System.out.println(file.canRead());
    // System.out.println(file.isAbsolute());
    // System.out.println(file.getAbsolutePath());
    // System.out.println(file.getAbsoluteFile());
    // list = file.list();
                //Arrays.sort(list);
    // for(int i = 0; i < list.length; i++)
    // System.out.println(list[i]);
    
                byte[] b = {
       1,2,3,4,5,6,7,8,9};
    
                try {
                    FileOutputStream f = new FileOutputStream(file);
                    try {
                        f.write(b);
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
    
    
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
        }
    }
    
    class DirFilter implements FilenameFilter{
    
        private Pattern pattern;
    
        public DirFilter(String regex){
            pattern = pattern.compile(regex);
        }
    
        @Override
        public boolean accept(File dir, String name) {
            // TODO Auto-generated method stub
            return pattern.matcher(new File(name).getName()).matches();
        }
    
    }

3.test\_3 ( I/O )

package competion;
    
    import java.io.File;
    import java.io.FilenameFilter;
    import java.util.Arrays;
    import java.util.regex.Pattern;
    
    public class DirList { 
    
    // public static FilenameFilter filter(final String regex){ 
    // 
    // return new FilenameFilter(){ 
    // 
    // Pattern pattern = Pattern.compile(regex);
    // 
    // public boolean accept(File dir, String name){ 
    // return pattern.matcher(new File(name).getName()).matches();
    // }
    // 
    // };
    // 
    // }
    
        public static void main(final String[] args){
    
            File path = new File(".");
    // System.out.print(path.getName());
            String[] list = null;
            if(args.length == 0)
                list = path.list();
    // else
    // list = path.list(new FilenameFilter(){ 
    // private Pattern pattern = Pattern.compile(args[0]);
    // 
    // public boolean accept(File dir,String name){ 
    // return pattern.matcher(new File(name).getName()).matches();
    // }
    // });
    
            Arrays.sort(list);
    
            for(int i = 0; i < list.length; i++)
                System.out.println(list[i]);
        }
    }
    
    //class DirFilter implements FilenameFilter{ 
    //
    // private Pattern pattern;
    // 
    // public DirFilter(String regex){ 
    // pattern = pattern.compile(regex);
    // }
    // 
    // @Override
    // public boolean accept(File dir, String name) { 
    // // TODO Auto-generated method stub
    // return pattern.matcher(new File(name).getName()).matches();
    // }
    // 
    //}

4.test\_4 ( I/O )

package competion;
    
    import java.io.File;
    
    public class MakeDirectories {
    
        private static void usage(){
    
            System.err.println("error");
            System.exit(1);
        }
    
        private static void fileData(File f){
            System.out.println("absoulte:"+f.getAbsolutePath()+
                    "\n read:"+f.canRead()+
                    "\n write:"+f.canWrite()+
                    "\n name"+f.getName()+
                    "\n parent"+f.getParent()+
                    "\n path"+f.getPath()+
                    "\n length"+f.length()+
                    "\n modified:"+f.lastModified());
            if(f.isFile())
                System.out.println("is a File");
            else if(f.isDirectory())
                System.out.println("is a directory");
        }
    
        public static void main(String[] args){
    
            if(args.length<1)
                usage();
            if(args[0].equals("-r")){
                if(args.length!=3) usage();
                File
                    old = new File(args[1]),
                    rname = new File(args[2]);
                old.renameTo(rname);
                fileData(old);
                fileData(rname);
                return;
            }
    
            int count = 0;
            boolean del = false;
            if(args[0].equals("-d")){
                count++;
                del = true;
            }
            count --;
    
            while(++count<args.length){
                File f = new File(args[count]);
                if(f.exists()){
                    System.out.println(f+"exists");
                    if(del){
                        System.out.println("deleting..."+f);
                        f.delete();
                    }   
                }else{
                    if(!del){
                        f.mkdirs();
                        System.out.println("created"+f);
                    }
                }
                fileData(f);
            }
            if(args.length == 1 && args[0].equals("MakeDirectoriesTest"));
    
        }
    }

1.  test\_5 ( 面向对象——计算器 )

package com.jereh5;
    
    import java.util.Scanner;
    
    public class Calculator {
    
        private double fristNum  = 0;
        private double secondNum = 0;
    
        public Calculator(double fristNum,double secondNum){
    
            this.fristNum  = fristNum;
            this.secondNum = secondNum;
        }
    
        public double add(){
            return fristNum+secondNum;
        }
    
        public double minus(){
            return fristNum-secondNum;
        }
    
        public double mult(){
            return fristNum*secondNum;
        }
    
        public double except(){
            return fristNum/secondNum;
        }
    
        public static void main(String[] args){
    
            Scanner scn = new Scanner(System.in);
    
            System.out.println("请输入第一个数：");
    
            double first  = scn.nextDouble();
    
            System.out.println("请输入第二个数:");
    
            double second  = scn.nextDouble();
    
            Calculator c = new Calculator(first,second);
    
            System.out.println("请选择你要进行的运算：");
            int num = scn.nextInt();
    
            double result = num > 5? c.minus() : (num>10? (num>100? c.except() : c.mult()) : c.add()) ;
    
            System.out.println("计算结果为："+result);
        }
    }

1.  test\_6 ( 面向对象 )

package com.jereh5;
    
    public class Coordinate {
    
        private int x;
        private int y;
    
        public Coordinate(int x,int y){
            this.x = x;
            this.y = y;
        }
    
        public int getX(){
            return x;
        }
    
        public int getY(){
            return y;
        }
    
        public static void main(String[] args){
    
            Coordinate coo = new Coordinate(23,54);
    
            System.out.println("x坐标"+coo.getX()+"\ny坐标"+coo.getY());
    
        }
    }

1.  test\_7 （面向对象——模拟提款机）

package com.jereh5;
    
    import java.util.Scanner;
    
    public class User {
    
        private String name = "";
        private int pwd = 1111;
        private boolean boolInput = false;
        private boolean boolMoney = false;
    
        public User(String name, int pwd){
            this.name = name;
            this.pwd  = pwd ;
        }
    
        public boolean jadgeInput(){
            if(pwd==1111){
                boolInput = true;
            }else{
                boolInput = false;
            }
            return boolInput;
        }
    
        public boolean jadgeMoney(int num){
            if(num%100==0){
                boolMoney = true;
            }else{
                boolMoney = false;
            }
            return boolMoney;
        }
    
        public static void main(String[] args){
    
            Scanner scn = new Scanner(System.in);
    
            for(int i = 1; i < 4; i++){
    
                System.out.println("请输入用户名：");
                String inputUser = scn.next();
    
                System.out.println("请输入密 码 ：");
                int inputPwd = scn.nextInt();
                User user = new User(inputUser,inputPwd);
    
                if(user.jadgeInput()){
                    while(true){
                        System.out.println("请输入要取的金额：");
                        int inputNum = scn.nextInt();
    
                        if(user.jadgeMoney(inputNum)){
                            System.out.println(user.name+"先生，您取款的金额为："+inputNum+"元");
                            break;
                        }else{
                            System.out.println("金额输入有误！");
                        }
                    }
                }else{
                    System.out.println("密码错误!");
                }
            }
    
            System.out.println("SB,这不是你的卡！");
        }
    }

1.  test\_8 (面向对象——门票)

package com.jereh5;
    
    import java.util.Scanner;
    
    public class Visitor {
    
        private String name = "";
        private int    age  = 0 ;
        private int  ticket = 100;
    
        public Visitor(String name , int age){
            this.name = name;
            this.age  = age;
        }
    
        public void showPrice(){
    
            if(age<=10){
                System.out.println(name+"的年龄为："+age+",所以票价为：免费");
            }else if(age<20){
                System.out.println(name+"的年龄为："+age+",所以票价为："+ticket*0.8+"元");
            }else{
                System.out.println(name+"的年龄为："+age+",所以票价为："+ticket+"元");
            }
        }
    
        public static void main(String[] args){
    
            Scanner scn = new Scanner(System.in);
    
            System.out.println("大家注意啦：儿童免费，青年八折，中年全票！");
    
            System.out.print("请输入您的姓名：");
            String inputName = scn.next();
    
            System.out.print("请输入您的年龄：");
            int inputAge     = scn.nextInt();
    
            Visitor vi  = new Visitor(inputName,inputAge);
    
            vi.showPrice();
    
        }
    }

1.  test\_9 （面向对象——求矩形面积和周长）

package com.jereh5;
    
    public class Rectangle {
    
        private int length = 1,
                    width = 1;
    
        public void setLength(int length){
            this.length = length;
        }
    
        public int getLength(){
            return length;
        }
    
        public void setWidth(int width){
            this.width = width;
        }
    
        public int getWidth(){
            return width;
        }
    
        public int perimeter(){
    
            return 2*(length+width);
    
        }
    
        public int area(){
    
            return length*width;
        }
    
        public static void main(String[] args){
    
            Rectangle rec = new Rectangle();
    
            rec.setLength(12);
            rec.setWidth(8);
    
            System.out.println("周长为："+rec.perimeter());
            System.out.println("面积为："+rec.area());
    
        }
    }

1.  test\_10 （面向对象）

package com.jereh5;
    
    public class Student {
    
        private String name    = "";
        private String classes = "";
        private double sorce   = 0 ;
    
        public void setName(String name){
            this.name = name;
        }
    
        public String getName(){
            return name;
        }
    
        public void setClasses(String classes){
            this.classes = classes;
        }
    
        public String getClasses(){
            return classes;
        }
    
        public void setSorce(double sorce){
            this.sorce = sorce;
        }
    
        public double getSorce(){
            return sorce;
        }
    
        public void getResult(){
            System.out.println(classes+name+"，你的成绩是："+sorce);
        }
    
        public void getResult(double sorce){
            System.out.println(classes+name+"，你的成绩是："+sorce);
        }
    
        public static void main(String[] args){
    
            Student student = new Student();
    
            student.setName("小名");
            student.setSorce(90);
            student.setClasses("大班");
    
            student.getResult();
        }
    
    }