Java编程题每日一练day1

Day1共7题

package com.pcx.day1;

/**

* 设一个字符数组，对其元音字母进行统计

* a e i o u

* @author Administrator

*

*/

public class YuanYin {

    public static void main(String[] args) {

        char [] chars={'a','b','c','d','e'};

        int count=0;

        for (int i = 0; i < chars.length; i++) {

            if (chars[i]=='a'||chars[i]=='e'||chars[i]=='i'||chars[i]=='o'||chars[i]=='u') {

                count++;

            }

        }

        System.out.println("元音字母的个数为："+count);

    }

}

 

package com.pcx.day1;

/**

* 打印1000以内的水仙花数

* 153

* @author Administrator

*

*/

public class ShuiXianHua {

    public static boolean isShuiXianHuan(int a){

        int ge=a%10;

        int shi=a/10%10;

        int bai=a/100;

        if (Math.pow(ge,3)+Math.pow(shi,3)+Math.pow(bai,3)==a) {

            return true;

        }else {

            return false;

        }

    }

    

    public static void main(String[] args) {

        for (int i = 100; i < 1000; i++) {

            if (isShuiXianHuan(i)) {

                System.out.println(i+" 是水仙花数");

            }

        }

    }

}

package com.pcx.day1;

 

import java.util.Calendar;

 

public class RiQi {

    /**

     * 接收三个参数分别是年，月，日,然后返加一个Calendar类型的对象

     */

    public static Calendar getCalendar(int year, int month, int day){

        Calendar c=Calendar.getInstance();

        c.set(year, month, day);

        return c;

    }

    

    /**

     * 打印此日期是一个月的第几天，一年的第几天，一周的第几天，此天是周几，这个月的第一天是周几，是一周的第几天。

     * @param c

     */

    public static void show(Calendar c ){

        System.out.println("这个月的第几天："+c.get(Calendar.DAY_OF_MONTH));

        System.out.println("这个年的第几天："+c.get(Calendar.DAY_OF_YEAR));

        System.out.println("这个周的第几天："+c.get(Calendar.DAY_OF_WEEK));

        System.out.println("这天周几："+(c.get(Calendar.DAY_OF_WEEK)-1));

        

        c.set(Calendar.DATE, 1);

        System.out.println("这个月的第一天是一周的第几天："+c.get(Calendar.DAY_OF_WEEK));

        System.out.println("这天周几："+(c.get(Calendar.DAY_OF_WEEK)-1));

    }

    

    public static void main(String[] args) {

        show(getCalendar(2015, 6, 28));

    }

}

package com.pcx.day1;

 

public class Person {

    private String name;

    private int age ;

    private boolean gendar;//true 男 false 女

    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 boolean isGendar() {

        return gendar;

    }

    public void setGendar(boolean gendar) {

        this.gendar = gendar;

    }

    

    public void walk(){

        System.out.println(this.name+"在走。。。");

    }

    

    public void eat(){

        System.out.println(this.name+"在吃。。。");

    }

}

 

package com.pcx.day1;

 

public class PersonTest {

    public static void main(String[] args) {

        //Lucy，女，23岁；Jame，男，25岁

        Person p1=new Person();

        p1.setName("lucy");

        p1.setGendar(false);

        p1.setAge(23);

        Person p2=new Person();

        p2.setName("Jame");

        p2.setGendar(true);

        p2.setAge(25);

        p1.walk();

        p1.eat();

        p2.walk();

        p2.eat();

    }

}

package com.pcx.day1;

/**

* 求1+2!+3!+...+20!的和

* @author Administrator

*

*/

public class Jiechenghe {

    public static int getJieCheng(int a){

        if(a==0||a==1){

            return 1;

        }else {

            return a*getJieCheng(a-1);

        }

    }

    public static void main(String[] args) {

        int sum=0;

        for (int i = 1; i <=20; i++) {

            sum+=getJieCheng(i);

        }

        System.out.println("1+2!+3!+...+20!="+sum);

    }

}

package com.pcx.day1;

/**

* 一球从100米高度自由落下，每次落地后反跳回原高度的一半；

* 再落下，求它在 第10次落地时，共经过多少米？第10次反弹多高？

* @author Administrator

*

*/

public class Qiu {

    public static void main(String[] args) {

        int gao=100,gn=gao/2;

        int total=0+100;

        for (int i =2; i <=10; i++) {

            total=total+2*gn;

            gn=gn/2;

        }

        System.out.println("十次一共经过了："+total+"米");

        System.out.println("第十次反弹："+gn);

    }

}