java试题

1.
package javawork;

import java.util.Scanner;

public class Work01 {
    public static void main(String[] args) {
        Scanner in =new Scanner(System.in);
        System.out.println("请输入**月**日****年");
        String a = in.nextLine();
        int count  =a.indexOf("日");
        String year = a.substring(count +1);
        String mon_day = a.substring(0,count + 1);
        System.out.println(year+mon_day);

    }

}
2.package javawork;

import java.util.Scanner;

public class Work02 {
public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("请输入一个字符串：");
        String s = in.nextLine();
char arr[] = s.toCharArray();
int num = 0;
int zimu = 0;
for(int i=0;i<s.length();i++){
if (arr[i]>='a'&&arr[i]<='z'||arr[i]>='A'&&arr[i]<='Z') {
                zimu++;

            }
else if(arr[i]>='0'&&arr[i]<='9'){
                num++;
            }
        }
        System.out.println("数字有"+num+"个"+"  "+"字母有"+zimu+"个");
    }
}
3.package javawork;

import java.util.Scanner;
public class Work03{
public static void main(String[] args) {
        String arr[] = {"性", "色情", "爆炸", "恐怖", "枪", "军火"};
        Scanner sc  = new Scanner(System.in);
        String str  = sc.nextLine();
for(int i=0;i<arr.length;i++) {
while (true) {
if (str.indexOf(arr[i]) >= 0) {
                    str = str.replace(arr[i], "**");
                }
else{
break;
                }
            }
        }
        System.out.println(str);
    }

}
4.package javawork;

public class Work04 {
public static void main(String[] args) {
        String s = " 这些年一个人，风也过，雨也走，有过泪，有过错, 还记得坚持甚么，真爱过才会懂，会寂寞会回首，终有梦终有你在心中。  朋友一生一起走，那些日子不再有，     一 句 话，一辈子，一生情，一杯酒。朋友不曾孤单过，一声朋友你会懂，还有伤，还有痛，还要走，还有我。";
int count = 0;


while (true) {
if (s.indexOf("朋友") != -1) {
         count++;
         s = s.substring(s.indexOf("朋友")+1);
         } else {
break;
         }

         }
         System.out.println(count);
    }

}
5.package javawork;

import java.util.Scanner;

public class Work05 {

public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("请输入年份：");
int year = in.nextInt();
        System.out.println("请选择产品类型（1.台式机 2.笔记本 3.其他）:");
int style = in.nextInt();
int m = (int)(Math.random()*1000);
        System.out.println(year+"0"+style+m);
    }
}
6.package javawork;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

public class Work06 {
public static void main(String[] args) throws Exception {
//r闰年366   平年365
        Scanner in = new Scanner(System.in);
        System.out.println("请输入第一个日期：yyyy-mm-zz");
        String str = in.nextLine();
        System.out.println("请输入第二个日期：yyyy-mm-zz");
        String atr = in.nextLine();
        SimpleDateFormat sd = new SimpleDateFormat("yyyy-mm-zz");
        Date d = sd.parse(str);
        Date d2 = sd.parse(atr);
long time;
if (d.after(d2)) {
            time = d.getTime() - d2.getTime();
        } else {

            time = d2.getTime() - d.getTime();

        }
long a = 1000*60*60*24;
long day = time/a;
long week = day/7;
        System.out.println(day);
        System.out.println(week);
    }
}
7.package javawork;

public class Work07 {
public static void main(String[] args) {
long begin = System.currentTimeMillis();
for(int i=2000;i<2100;i++){
if(i%400==0||(i%4==0&&i%100!=0)){
                System.out.println(i);
            }

        }
long end = System.currentTimeMillis();
        System.out.println(end-begin);
    }
}
8.package javawork;

public class Work08 {
public static void main(String[] args) throws Exception{
        String str = "Hello World";
        StringBuilder s1 = new StringBuilder();
        StringBuilder s2 = new StringBuilder();
char ch[] = str.toCharArray();
for(int i=0;i<ch.length;i++){
if(ch[i]<'z'&&ch[i]>'a'){
                s1.append(ch[i]);
            }
if(ch[i]<'Z'&&ch[i]>'A'){
                s2.append(ch[i]);
            }
        }
        System.out.println(s1+" "+s2);
    }
}
9.package javawork;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;

public class Work09 {
public static void main(String[] args) throws Exception{
        System.out.println("请输入一个时间：yyyy-dd-xx");
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        SimpleDateFormat df = new SimpleDateFormat("yyyy-dd-xx");
        Date d = df.parse(str);
        Calendar c = Calendar.getInstance();
        c.setTime(d);
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH)+1;
int week = c.get(Calendar.DAY_OF_WEEK)-1;
if(year%400==0||(year%4==0&&year%100!=0)){
            System.out.println("闰年");
        }
else{
            System.out.println("平年");
        }
int max = c.getActualMaximum(Calendar.DAY_OF_MONTH);
        String s =week==0?"周日":"周"+week;
        System.out.println(month+"月有"+max+"天"+"该日是"+s);


    }
}

 

转载于:https://www.cnblogs.com/aini99/p/11048000.html