import java.util.Scanner; public class Test46 { /**
* 【程序46】
*题目：两个字符串连接程序
* */
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入第一个字符串：");
String str1 = input.next();
System.out.println("请输入第二个字符串：");
String str2 = input.next();
String str3 = str1.concat(str2);
System.out.println(str3);
}
}


import java.util.Scanner; public class Test49 { /**
* 【程序49】 题目：计算字符串中子串出现的次数
* */
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入字符串：");
String str = input.next(); System.out.println("请输入子串：");
String str1 = input.next(); int lenStr = str.length();
int lenStr1 = str1.length();
int count = 0;
for (int i = 0; i < lenStr - lenStr1; i++) {
String str2 = str.substring(i, i + lenStr1);
if (str1.equals(str2)) {
count++;
}
} System.out.println("子串" + str1 + "出现了" + count + "次");
}
}


做了一个关于两个日期间相差多少天的问题，系统应该有写好的类能很好的解决该方法，也许在SimpleDateFormat类，也许Calendar类，这里没有去研究，自己写了几个相关类，名字都是瞎编的~~~~

package com.baqn.bm.dayoflife; public class LeapYear { /**
* 此类为了判断年份是不是为闰年
*
* */
private int year; public int getYear() {
return year;
} public void setYear(int year) {
this.year = year;
}
//这个方法是此类主要的方法
public static int dayOfYear(int year){
if(year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)){
return 366;
}
else{
return 365;
}
}
}


package com.baqn.bm.dayoflife;
public class DayOfThisYear { /**
* 此类计算这一天是这一年的第几天
*
* */
private int year;
private int day;
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public int getDay() {
return day;
}
public void setDay(int day) {
this.day = day;
}
public static int dayOfYear(int year,int month, int day){
int result = 0;
int february = 28;
// 判断是不是闰年，如果是就执行代码块 february = 29;
if (LeapYear.dayOfYear(year) == 366) { february = 29; } switch (month) {
case 1:
result = day;
break; case 2:
result = 31 + day;
break; case 3:
result = 31 + february + day;
break; case 4:
result = 31 + february + 31 + day;
break; case 5:
result = 31 + february + 31 + 30 + day;
break; case 6:
result = 31 + february + 31 + 30 + 31 + day;
break; case 7:
result = 31 + february + 31 + 30 + 31 + 30 + day;
break; case 8:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + day;
break; case 9:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + 31 + day;
break; case 10:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + 31 + 30 + day;
break; case 11:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31
+ day;
break; case 12:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30
+ day;
break;
}
return result;
}
}

package com.baqn.bm.dayoflife;
public class DayofYearToYear { /**
* 此类计算这一年与指定的一年间相差多少天
*
*
* */
public static int dayofYearToYear(int year1, int year2){
int temp = 0;
if(year1 > year2){
temp = year1;
year1 = year2;
year2 = temp;
}
int count = 0;
for(int i = year1; i < year2; i++){
if(LeapYear.dayOfYear(i) == 366){
count++;
}
}
int day = (year2 - year1)*365 + count;
return day;
}
}


package com.baqn.bm.dayoflife; public class GetDate { // private int year;
// private int month;
// private int day;
//
// 将用户输入的一个字符型日期转化为整型，并存在数组中(日期格式如1992.1.1)
public int[] getDate(String date) {
String[] dateArray = date.split("\\.");
int[] IntegerDate = new int[dateArray.length];
for (int i = 0; i < IntegerDate.length; i++) {
IntegerDate[i] = Integer.parseInt(dateArray[i]);
}
return IntegerDate;
}
}


import java.util.Scanner;
public class TestDayOfLife { /**
* 计算两个日期间相差的天数~~~
* */
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入您的生日：");
String birthday = input.next();
System.out.println("请输入当前的日期：");
String today = input.next();
GetDate getDate = new GetDate();
int[] birArray = getDate.getDate(birthday);
int[] todayArray = getDate.getDate(today);
// 计算今年与出生的那一年相差多少天
int day1 = DayofYearToYear.dayofYearToYear(birArray[0], todayArray[0]);
// 分别计算今年和出生年份的当前日期 是 这一年的第几天
int day2 = (DayOfThisYear.dayOfYear(todayArray[0], todayArray[1],
todayArray[2]) - DayOfThisYear.dayOfYear(birArray[0],
birArray[1], birArray[2]));
int result = day1 + day2;
System.out.println("从出生到现在您已经渡过了" + result + "个单身的日子！！！！");
}
}


http://blog.sina.com.cn/s/blog_48d22fc90100arwo.htm
佛经名句

程序：显示日历 --- 输入一年份 显示这一年的日历

package com.baqn.bm.calender; public class LeapYear { /**
* 此类为了判断年份是不是为闰年
*
* */
private int year; public int getYear() {
return year;
} public void setYear(int year) {
this.year = year;
} // 这个方法是此类主要的方法
public static boolean dayOfYear(int year) {
if (year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)) {
return true;
} else {
return false;
}
}
}


package com.baqn.bm.calender; public class DayOfMonth { /**
* 此类计算这个月有多少天。
*
* */
private int year;
private int day; public int getYear() {
return year;
} public void setYear(int year) {
this.year = year;
} public int getDay() {
return day;
} public void setDay(int day) {
this.day = day;
} public static int dayOfMonth(int year, int month) { int result = 0;
int february = 28;
// 判断是不是闰年，如果是就执行代码块february = 29;
if (LeapYear.dayOfYear(year)) { february = 29; } switch (month) {
case 1:
result = 31;
break; case 2:
result = february;
break; case 3:
result = 31;
break; case 4:
result = 30;
break; case 5:
result = 31;
break; case 6:
result = 30;
break; case 7:
result = 31;
break; case 8:
result = 31;
break; case 9:
result = 30;
break; case 10:
result = 31;
break; case 11:
result = 30;
break; case 12:
result = 31;
break;
}
return result;
}
}

package com.baqn.bm.calender;
public class DayOfThisYear {
/**
* 此类计算这一天是这一年的第几天
*
* */
private int year;
private int day;
public int getYear() {
return year;
} public void setYear(int year) {
this.year = year;
} public int getDay() {
return day;
} public void setDay(int day) {
this.day = day;
}
public static int dayOfYear(int year, int month, int day) {
int result = 0;
int february = 28;
// 判断是不是闰年，如果是就执行代码块 february = 29;
if (LeapYear.dayOfYear(year)) { february = 29; }
switch (month) {
case 1:
result = day;
break; case 2:
result = 31 + day;
break; case 3:
result = 31 + february + day;
break; case 4:
result = 31 + february + 31 + day;
break; case 5:
result = 31 + february + 31 + 30 + day;
break; case 6:
result = 31 + february + 31 + 30 + 31 + day;
break; case 7:
result = 31 + february + 31 + 30 + 31 + 30 + day;
break; case 8:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + day;
break; case 9:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + 31 + day;
break; case 10:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + 31 + 30 + day;
break; case 11:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31
+ day;
break; case 12:
result = 31 + february + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30
+ day;
break;
}
return result;
}
}


package com.baqn.bm.calender; public class DayOfWeek { /**
* 判断某一年某个月的第一天是星期几
*
*
* */ public static int dayOfWeek(int month, int year) {
// 每一年的第一个月的第一天是星期几 星期日对应n==0的时候
int n = ((year - 1) + (year - 1) / 4 - (year - 1) / 100 + (year - 1)
/ 400 + 1) % 7;
// day表示这个月的第一天是这一年的第几天
int day = DayOfThisYear.dayOfYear(year, month, 1);
// result表示这个月的第一天是星期几
int result = ((day + n - 1) % 7);
// System.out.println(day);
return result;
}
}


package com.baqn.bm.calender;
public class DayOfWeek {
/**
* 判断某一年某个月的第一天是星期几
* */
public static int dayOfWeek(int month, int year) {
// 每一年的第一个月的第一天是星期几 星期日对应n==0的时候
int n = ((year - 1) + (year - 1) / 4 - (year - 1) / 100 + (year - 1)
/ 400 + 1) % 7;
// day表示这个月的第一天是这一年的第几天
int day = DayOfThisYear.dayOfYear(year, month, 1);
// result表示这个月的第一天是星期几
int result = ((day + n - 1) % 7);
// System.out.println(day);
return result;
}
}