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Java第一学期上机试题

Java第一学期上机试题

作者: 秋一哲 | 来源:发表于2019-12-16 17:00 被阅读0次

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    1、要求从键盘输入3个数,然后输出其中最大的数!

    int a=1,b=2,c=3,x;
    x = Math.max(a, b);
    x = Math.max(x, c);
    

    2\3 4不写


    结果

    5.编写一个简单的加密处理程序,从键盘输入一段英文文字,将其中每个字母用其后的第4个字母代替,最后的字母轮回道前面的字符,其他符号不变。如:a用代替;z用d代替。

    package Word;
    import java.util.Scanner;
    public class Work {
        public static void main(String args[]) {
            Scanner io = new Scanner(System.in); //定义输入工具
            String t = io.next(); //输入文本保存到 t
    //      t = "Chzx!"; //测试内容 无用
            int n = 4; //表示进4位
            for (int i = 0; i < t.length(); i++) {
                char oneChar = t.charAt(i);//oneChar:一个字符    从t当中挨个取得 
                if (oneChar >= 'a' && oneChar <= 'z' - n || oneChar >= 'A' && oneChar <= 'Z' - n) {
                    oneChar += n;
                }else if(oneChar >= 'z'-n && oneChar <= 'z'|| oneChar >= 'Z'-n && oneChar <= 'Z'){
                    oneChar -= 26-n;
                }
                System.out.print(oneChar);
            }
        }
    }
    

    6、从键盘输入5个任意字符串存到数组中,将数组元素按由小到大排列 。

    package Word;
    import java.util.Scanner;
    public class Work {
        public static void main(String args[]) {
            Scanner io = new Scanner(System.in);
            String[] list = new String[5];
            for (int i = 0; i < 5; i++) {
                list[i] = io.next();
            }
            java.util.Arrays.sort(list); // 排序
            for (int i = 0; i < 5; i++) { // 这里为输出可以不写
                System.out.println(list[i]);
            }
        }
    }
    

    7、从键盘输入一段英文文字,然后,将该句反向输出。如:who are you变成uoy era ohw

    package Word;
    import java.util.Scanner;
    public class Work {
        public static void main(String args[]) {
            Scanner io = new Scanner(System.in);
            StringBuffer t = new StringBuffer(io.nextLine());
            t.reverse();
            System.out.print(t);
        }
    }
    

    8、String s = "Nice to meet you, Jack!"统计该英文中一共有多少个单词。

    package Word;
    import java.util.Scanner;
    public class Work {
        public static void main(String args[]) {
            String  s = "Nice to meet you, Jack!";
            int n = s.split(" ").length;
            System.out.print(n);
        }
    }
    

    9.定义一个 Person类,包括:私有属性姓名、性别、年龄,(可提供对以上私有属性的set与get操作方法。)再定义一个Students类,继承Person类,增加私有属性学号、班级。显示“张三”,“男” ,

    package Word;
    
    import java.util.Scanner;
    class Person {
        private String name, gender, age;
    
        public Person(String name, String gender, String age) {
            this.name = name;
            this.gender = gender;
            this.age = age;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getGender() {
            return gender;
        }
    
        public void setGender(String gender) {
            this.gender = gender;
        }
    
        public String getAge() {
            return age;
        }
    
        public void setAge(String age) {
            this.age = age;
        }
    }
    
    class Students extends Person {
        private String id, myClass;
    
        public Students(String name, String gender, String age, String id,
                String myClass) {
            super(name, gender, age);
            this.id = id;
            this.myClass = myClass;
        }
    
        public String toString() {
            return super.getName() + "," + super.getGender() + "," + super.getAge()
                    + "," + this.id + "," + this.myClass;
        }
    }
    
    public class Work {
        public static void main(String args[]) {
            Students zhangSan = new Students("张三", "男", "19", "17510101", "175101");
            System.out.print(zhangSan);
        }
    }
    

    10、设计一个类,其功能是完成1-n的求和。类中包含一个属性(int n);一个方法:(求1-n的和)。编程:利用该类实现1-50、1-100的和。

    package Word;
    class ToN{
        int n;
        
        public ToN(int n) {
            this.n = n; //如果n代表1-n的n那么意义可能大一些
        }
    
        public int sum(){
            int x=0;
            for(int i=1;i<=n;i++){
                x+=i;
            }
            return x;
        }
    }
    public class Work {
        public static void main(String args[]) {
            ToN obj = new ToN(50);
            System.out.print(obj.sum());
        }
    }
    

    11、定义接口Shape,其中包括一个方法size(),设计“矩形”、“圆” 等类实现Shape接口,其size()方法分别表示计算矩形面积、圆面积。分别创建代表“矩形”、“圆” 的两个对象存入一个Shape类型的数组中,通过调用size()方法将数组中各类图形的面积大小输出。
    备注:利用该类实现(边长=5,”矩形”,面积)、(半径=2,”圆”,面积)

    package Word;
    import java.util.Scanner;
    
    interface Shape {
        double size();
    
    }
    
    class Jx implements Shape {
        double w;
        public double size() {
            return w * w;
        }
        public Jx(double w) {
            super();
            this.w = w;
        }
    }
    
    class Yuan implements Shape {
        double r;
        public double size() {
            return (Math.PI * r * r);
        }
        public Yuan(double r) {
            super();
            this.r = r;
        }
    }
    
    public class Work {
        public static void main(String args[]) {
            Jx jx1 = new Jx(5);
            Yuan y1 = new Yuan(2);
            Shape list [] = {jx1,y1};
            for(int i=0;i<2;i++){
                System.out.println(list[i].size());
            }
        }
    }
    

    12、定义一个抽象类-水果,其中包括总价total()抽象方法,编写程序分别创建苹果、橘子两个类,创建两个水果对象存放在一个水果类型的数组中,输出数组中所有水果的类型、重量以及总价。
    备注:利用该类实现(”苹果”,2,总价)、(”橘子”,5,总价)

    package Word;
    import java.util.Scanner;
    abstract class Fruit{
        abstract String total();
    }
    class apple extends Fruit{
        double price=10,number;
        public apple(double number) {
            this.number = number;
        }
        String total() {
            return "苹果" + number + "  个"+"总价:"+price*number;
        }
    }
    class orange extends Fruit{
        double price=15,number;
        public orange(double number) {
            this.number = number;
        }
        String total() {
            return "橘子" + number + "  个"+"总价:"+price*number;
        }
    }
    public class Work {
        public static void main(String args[]) {
            apple obj1 = new apple(2);
            orange obj2 = new orange(2);
            fruit list[] = {obj1,obj2};
            for(int i=0;i<2;i++){
                System.out.println(list[i].total());
            }
    
        }
    }
    

    13.编写一个代表三角形的类。其中,三条边为三角型的属性,并封装有求三角形的面积和周长的方法。并设计构造方法和toString() 方法。分别针对三条边为3,4,5和7,8,9的两个三角形进行测试。

    package Word;
    
    public class Work {
        public static void main(String[] arg) {
            // Triangle obj = new Triangle(3,4,5);
            Triangle obj = new Triangle(7, 8, 9);
            obj.getArea();
            obj.getPerimeter();
            System.out.print(obj.toString());
        }
    }
    
    class Triangle {
        private int a, b, c;
    
        public Triangle(int d1, int d2, int d3) {
            a = d1;
            b = d2;
            c = d3;
        }
    
        public void getArea() {
            int p = (a + b + c) / 2;
            double S = Math.sqrt((p * (p - a) * (p - b) * (p - c)));
            System.out.println(S);
        }
    
        public void getPerimeter() {
            int data;
            data = a + b + c;
            System.out.println(data);
        }
    
        public String toString() {
            return "a:" + a + "  b:" + b + "  c:" + c;
        }
    }
    

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