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android取余,android求余

Android-DH 秘鑰交換

DH 是 Whitfield Diffie 和 Martin Hellman 在1976年共同發(fā)明的一種秘鑰交換算法。主要用于在不安全的網(wǎng)絡(luò)上客戶端和服務(wù)端通過交換公鑰,生成一個相同的秘鑰,并將該秘鑰作為對稱加密算法的秘鑰,達到使對稱加密算法的秘鑰可以動態(tài)修改的目的。這樣便提高了數(shù)據(jù)在網(wǎng)絡(luò)上傳輸?shù)陌踩浴?/p>

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DH 總共包含四個部分,分別是:質(zhì)數(shù)原根對、公鑰、私鑰和秘鑰。

1. 客戶端和服務(wù)端使用相同的質(zhì)數(shù)原根對:P=23 和 G=5,這是秘鑰交換的必須條件。

2. 服務(wù)端生成隨機整數(shù) A = 6,并將 A 作為私鑰,使用公鑰計算公式:

公鑰 = G 的 A 次方 取余 P,等于 Math.pow(5,6) % 23,服務(wù)端的公鑰為: 8。

3. 客戶端生成隨機整數(shù) B = 7,并將 B 作為私鑰,使用公鑰計算公式:

公鑰 = G 的 B 次方 取余 P,等于 Math.pow(5,7) % 23,客戶端的公鑰為: 17。

4. 服務(wù)端用客戶端的公鑰生成秘鑰,使用秘鑰計算公式:

秘鑰 = 17 的 A 次方 取余 P,等于 Math.pow(17,6) % 23,服務(wù)端的秘鑰為: 12。

5. 客戶端用服務(wù)端的公鑰生成秘鑰,使用秘鑰計算公式:

秘鑰 = 8 的 B 次方 取余 P,等于 Math.pow(8,7) % 23,客戶端的秘鑰為: 12。

客戶端和服務(wù)端通過交換公鑰,生成了相同的秘鑰。

java中取余運算符 (%)

首先在程序需要中對INT型變量/代表取整運行,注意區(qū)分它們的不同,而%只能用于整數(shù),取余運算 5%13=5,5除以13商0余5。

java取余運算:

取余(或余數(shù))運算符用 number1 除以 number2 (把浮點數(shù)四舍五入為整數(shù)),然后只返回余數(shù)作為 result。

通常取模運算也叫取余運算,他們都遵循處罰法則,返回結(jié)果都是余數(shù);

Java中取余運算具有如下性質(zhì):對所有int數(shù)值a和所有非零int數(shù)值b滿足:(a / b ) * b + (a % b) == a;

這意味著當(dāng)取余操作返回一個非零的結(jié)果時。它與左操作數(shù)具有相同的正負(fù)符號。

QQ通訊錄里面生日選擇對話框那里,陽歷和農(nóng)歷轉(zhuǎn)換怎么實現(xiàn)呢?急求android代碼,感謝各位大神了?。。?/h2>

package nongli;

import java.util.Calendar;

import java.util.Date;

public final class Lauar {

private static int monCyl, dayCyl, yearCyl;

private static int year, month, day;

private static boolean isLeap;

private static int[] lunarInfo = {0x04bd8, 0x04ae0, 0x0a570, 0x054d5,

0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2, 0x04ae0,

0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2,

0x095b0, 0x14977, 0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40,

0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970, 0x06566, 0x0d4a0,

0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7,

0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0,

0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0, 0x0b550, 0x15355,

0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0,

0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263,

0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0,

0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6, 0x095b0,

0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46,

0x0ab60, 0x09570, 0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50,

0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0, 0x0c960, 0x0d954,

0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0,

0x0cab5, 0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0,

0x0a5b0, 0x15176, 0x052b0, 0x0a930, 0x07954, 0x06aa0, 0x0ad50,

0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530,

0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6,

0x0d250, 0x0d520, 0x0dd45, 0x0b5a0, 0x056d0, 0x055b2, 0x049b0,

0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0};

private static int[] solarMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31,

30, 31};

private static String[] Gan = {"甲", "乙", "丙", "丁", "戊", "己", "庚", "辛",

"壬", "癸"};

private static String[] Zhi = {"子", "丑", "寅", "卯", "辰", "巳", "午", "未",

"申", "酉", "戌", "亥"};

private static String[] Animals = {"鼠", "牛", "虎", "兔", "龍", "蛇", "馬", "羊",

"猴", "雞", "狗", "豬"};

private static int[] sTermInfo = {0, 21208, 42467, 63836, 85337, 107014,

128867, 150921, 173149, 195551, 218072, 240693, 263343, 285989,

308563, 331033, 353350, 375494, 397447, 419210, 440795, 462224,

483532, 504758};

private static String[] nStr1 = {"日", "一", "二", "三", "四", "五", "六", "七",

"八", "九", "十"};

private static String[] nStr2 = {"初", "十", "廿", "卅", " "};

private static String[] monthNong = {"正", "正", "二", "三", "四", "五", "六",

"七", "八", "九", "十", "十一", "十二"};

private static String[] yearName = {"零", "壹", "貳", "叁", "肆", "伍", "陸",

"柒", "捌", "玖"};

private Object LogFactory;

public Lauar() {

}

//====================================== 傳回農(nóng)歷 y年的總天數(shù)

private static int lYearDays(int y) {

int i;

int sum = 348; //29*12

for (i = 0x8000; i 0x8; i = 1) {

sum += (lunarInfo[y - 1900] i) == 0 ? 0 : 1; //大月+1天

}

return (sum + leapDays(y)); //+閏月的天數(shù)

}

//====================================== 傳回農(nóng)歷 y年閏月的天數(shù)

private static int leapDays(int y) {

if (leapMonth(y) != 0) {

return ((lunarInfo[y - 1900] 0x10000) == 0 ? 29 : 30);

} else {

return (0);

}

}

//====================================== 傳回農(nóng)歷 y年閏哪個月 1-12 , 沒閏傳回 0

private static int leapMonth(int y) {

return (lunarInfo[y - 1900] 0xf);

}

//====================================== 傳回農(nóng)歷 y年m月的總天數(shù)

private static int monthDays(int y, int m) {

return ((lunarInfo[y - 1900] (0x10000 m)) == 0 ? 29 : 30);

}

//====================================== 算出農(nóng)歷, 傳入日期物件, 傳回農(nóng)歷日期物件

// 該物件屬性有 .year .month .day .isLeap .yearCyl .dayCyl .monCyl

private static void Lunar1(Date objDate) {

int i, leap = 0, temp = 0;

Calendar cl = Calendar.getInstance();

cl.set(1900, 0, 31); //1900-01-31是農(nóng)歷1900年正月初一

Date baseDate = cl.getTime();

//1900-01-31是農(nóng)歷1900年正月初一

int offset = (int) ((objDate.getTime() - baseDate.getTime()) / 86400000); //天數(shù)(86400000=24*60*60*1000)

dayCyl = offset + 40; //1899-12-21是農(nóng)歷1899年臘月甲子日

monCyl = 14; //1898-10-01是農(nóng)歷甲子月

//得到年數(shù)

for (i = 1900; i 2050 offset 0; i++) {

temp = lYearDays(i); //農(nóng)歷每年天數(shù)

offset -= temp;

monCyl += 12;

}

if (offset 0) {

offset += temp;

i--;

monCyl -= 12;

}

year = i; //農(nóng)歷年份

yearCyl = i - 1864; //1864年是甲子年

leap = leapMonth(i); //閏哪個月

isLeap = false;

for (i = 1; i 13 offset 0; i++) {

//閏月

if (leap 0 i == (leap + 1) isLeap == false) {

--i;

isLeap = true;

temp = leapDays(year);

} else {

temp = monthDays(year, i);

}

//解除閏月

if (isLeap == true i == (leap + 1)) {

isLeap = false;

}

offset -= temp;

if (isLeap == false) {

monCyl++;

}

}

if (offset == 0 leap 0 i == leap + 1) {

if (isLeap) {

isLeap = false;

} else {

isLeap = true;

--i;

--monCyl;

}

}

if (offset 0) {

offset += temp;

--i;

--monCyl;

}

month = i; //農(nóng)歷月份

day = offset + 1; //農(nóng)歷天份

}

private static int getYear() {

return (year);

}

private static int getMonth() {

return (month);

}

private static int getDay() {

return (day);

}

private static int getMonCyl() {

return (monCyl);

}

private static int getYearCyl() {

return (yearCyl);

}

private static int getDayCyl() {

return (dayCyl);

}

private static boolean getIsLeap() {

return (isLeap);

}

//============================== 傳入 offset 傳回干支, 0=甲子

private static String cyclical(int num) {

return (Gan[num % 10] + Zhi[num % 12]);

}

//====================== 中文日期

private static String cDay(int d) {

String s;

switch (d) {

case 10:

s = "初十";

break;

case 20:

s = "二十";

break;

case 30:

s = "三十";

break;

default:

s = nStr2[(int) (d / 10)];//取商

s += nStr1[d % 10];//取余

}

return (s);

}

private static String cYear(int y) {

String s = " ";

int d;

while (y 0) {

d = y % 10;

y = (y - d) / 10;

s = yearName[d] + s;

}

return (s);

}

public static String getLunar(String year, String month, String day) {

Date sDObj;

String s;

int SY, SM, SD;

int sy;

SY = Integer.parseInt(year);

SM = Integer.parseInt(month);

SD = Integer.parseInt(day);

sy = (SY - 4) % 12;

Calendar cl = Calendar.getInstance();

cl.set(SY, SM - 1, SD);

sDObj = cl.getTime();

//日期

Lunar1(sDObj); //農(nóng)歷

s = "農(nóng)歷 " + "【" + Animals[sy] + "】" + cYear(getYear()) + "年" + " ";

s += (getIsLeap() ? "閏" : "") + monthNong[getMonth()] + "月"+ (monthDays(getYear(), getMonth()) == 29 ? "小" : "大");

s += cDay(getDay()) + " ";

s += cyclical(getYearCyl()) + "年" + cyclical(getMonCyl()) + "月"+ cyclical(getDayCyl()) + "日";

return s;

}

public static void main(String[] args) {

System.out.println(getLunar("1990", "8", "26"));

System.out.println(getLunar("2008", "6", "8"));

System.out.println(getLunar("2009", "4", "3"));

System.out.println(getLunar("2011", "11", "22"));

}

}


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