用java遍寫元旦倒計時

import?java.util.Calendar;

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import?java.util.Date;

public?class?Countdown2?implements?Runnable?{

public?static?void?main(String[]?args)?{

Thread?cd?=?new?Thread(new?Countdown2());

cd.start();

}

@Override

public?void?run()?{

//?設置日期2012-12-21

Calendar?c?=?Calendar.getInstance();

c.set(2016,?1,?1,?0,?0,?0);

//?單獨設置年、月、日、小時、分鐘、秒

c.set(Calendar.YEAR,?2015);

c.set(Calendar.MONTH,?Calendar.DECEMBER);?//?0?表示1月，11?表示12月

c.set(Calendar.DAY_OF_MONTH,?21);

c.set(Calendar.HOUR_OF_DAY,?0);

c.set(Calendar.MINUTE,?0);

c.set(Calendar.SECOND,?0);

//?獲取2012-12-21?0:0:0時間點對應的毫秒數(shù)

long?endTime?=?c.getTimeInMillis();

//?獲取系統(tǒng)當前時間

Date?now?=?new?Date();

//?獲取當前時間點對應的毫秒數(shù)

long?currentTime?=?now.getTime();

//?計算兩個時間點相差的秒數(shù)

long?seconds?=?(endTime?-?currentTime)?/?1000;

while?(true)?{

long?days?=?seconds?/?(3600?*?24);

long?h?=?seconds?%?(3600?*?24)?/?3600;

long?m?=?seconds?%?(3600?*?24)?%?3600?/?60;

long?s?=?seconds?%?(3600?*?24)?%?3600?%?60;

System.out.println("離2016年元旦還剩：?"?+?days?+?"天"?+?h?+?"小時"?+?m?+?"分"?+?s?+?"秒");

seconds--;

try?{

Thread.sleep(1000);

}?catch?(InterruptedException?e)?{

e.printStackTrace();

}

}

}

}

用JAVA編寫一個簡單的生日提醒器，源代碼該怎么寫?。?/h2>

獲取系統(tǒng)時間：

import java.util.*;

import java.text.*;

public class TestDate {

public static void main(String[] args) {

Calendar ca = Calendar.getInstance();

int year = ca.get(Calendar.YEAR);//獲取年份

int month=ca.get(Calendar.MONTH);//獲取月份

int day=ca.get(Calendar.DATE);//獲取日

int minute=ca.get(Calendar.MINUTE);//分

int hour=ca.get(Calendar.HOUR);//小時

int second=ca.get(Calendar.SECOND);//秒

int WeekOfYear = ca.get(Calendar.DAY_OF_WEEK);

}

用系統(tǒng)時間跟生日比較就行了

java本地化問題。

java虛擬機加載資源文件和加載類一樣。如果資源文件和類放在一起，資源文件也需要加上包名。

還有可能是資源沖突了?？纯催@個

一段JAVA小代碼

改為，你的boolean數(shù)組沒有初始化，bar[0]取到的為null，if(null){} 編譯通不過去

1. String foo = “blue”;

2. Boolean[] bar = {true};

3. if (bar[0]) {

4. foo = “green”;

5. }

求程序員幫忙寫個Java代碼，因為今天我有事沒時間做，明天要交作業(yè)，謝謝了

代碼如下，隨便附一句，一定要看寫的源碼，我已經(jīng)盡量馬馬虎虎的寫了，你更容易看懂。

public?class?Test?{

//?第八題

public?static?final?int?NUM?=?100;

public?static?final?double?GOOD?=?99.99;

public?static?final?String?CLASSNAME?=?"Test.Class";

public?static?final?long?MAX?=?9999999;

public?static?void?main(String[]?args)?{

//?第一題

byte?byte1?=?1;

short?short1?=?1;

int?int1?=?1;

long?long1?=?1;

float?float1?=?1;

double?double1?=?1.0;

System.out.println("byte1?-?"?+?byte1);

System.out.println("short1?-?"?+?short1);

System.out.println("int1?-?"?+?int1);

System.out.println("long1?-?"?+?long1);

System.out.println("float1?-?"?+?float1);

System.out.println("double1?-?"?+?double1);

//?第二題

String?name;

char?sex;

int?age;

boolean?isMember;

//?第三題

int?score1;

double?score2?=?98.5;

//?第四題

double?f1?=?10.1,?f2?=?34.2;

System.out.println("f1，f2的和:"?+?(f1?+?f2));

System.out.println("f1，f2的差:"?+?(f1?-?f2));

System.out.println("f1，f2的積:"?+?(f1?*?f2));

System.out.println("f1，f2的商:"?+?(f1?/?f2));

//?第五題

int?f3?=?5;

double?f4?=?45.6;

System.out.println("f3，f4的和:"?+?(f3?+?f4));

System.out.println("f3，f4的差:"?+?(f3?-?f4));

System.out.println("f3，f4的積:"?+?(f3?*?f4));

System.out.println("f3，f4的商:"?+?(f3?/?f4));

//?第六題

int?A?=?65;

char?a?=?(char)?A;

System.out.println("整型互轉(zhuǎn)char:"?+?a);

//?第七題

double?timor?=?123.456789;

int?x?=?Integer

.parseInt(new?java.text.DecimalFormat("0").format(timor));//?四舍五入

System.out.println("double?-?int?:"?+?x);

//?第八題(定義在最開始)

System.out.println("常量NUM的值:?"?+?NUM);

System.out.println("常量GOOD的值:?"?+?GOOD);

System.out.println("常量CLASSNAME的值:?"?+?CLASSNAME);

System.out.println("常量MAX的值:?"?+?MAX);

//?第九題(自定義商品類)

class?Goods?{

private?String?name;

private?double?price;

private?int?count;

private?double?total;

public?Goods(String?name,?double?price,?int?count)?{

this.name?=?name;

this.price?=?price;

this.count?=?count;

}

public?void?print()?{

total?=?price?*?count;

System.out.println("商品名 ??價格??????數(shù)量 ?總價");

System.out.println(name?+?" ?"?+?price?+?" ?"?+?count?+?" ?"

+?total);

}

}

Goods?goods?=?new?Goods("蘋果",?2,?10);

goods.print();

//?第十題

double?pi?=?3.14,?r,?d;

r?=?4;

d?=?2?*?r;

System.out.println("圓的周長:?"?+?(pi?*?d));

System.out.println("圓的面積:?"?+?(pi?*?r?*?r));

//?第十一題

String?qqname?=?"1234567890";

String?qqpassword?=?"asd!#@#$%66";

Date?birth?=?new?Date(2014,?5,?1);

boolean?isVIP?=?false;

char?sex1?=?'男';

StringBuilder?personInfo?=?new?StringBuilder();

personInfo.append("我是一個快樂的騷年");

personInfo

.append("然后a!#$%^*asdasdasdasdsa9d87a9s8d79asdjidauisdhausdihiasd");

//?第十二題

class?Swaper?{

public?void?change(int?num1,?int?num2)?{

int?temp?=?num1;

num1?=?num2;

num2?=?temp;

System.out.printf("a=%d,b=%d\n",?num1,?num2);

}

}

int?a1?=?2;

int?b1?=?5;

Swaper?swaper?=?new?Swaper();

swaper.change(a1,?b1);

}

}

Java編程，填寫下面的代碼

class NoLowerLetterException extends Exception {

public NoLowerLetterException(String msg) {

super(msg);

}

}

class NoDigitException extends Exception {

public NoDigitException(String msg) {

super(msg);

}

}

class People {

void printLetter(char c) {

if (c = 'a' c = 'z') {

System.out.println(c);

} else {

try {

throw new NoLowerLetterException(String.valueOf(c));

} catch (NoLowerLetterException e) {

e.printStackTrace();

}

}

}

void printDigit(char c) {

if (c = '0' c = '9') {

System.out.println(c);

} else {

try {

throw new NoDigitException(String.valueOf(c));

} catch (NoDigitException e) {

e.printStackTrace();

}

}

}

}

public class ExceptionExample {

public static void main(String args[]) {

People people = new People();

for (int i = 0; i 128; i++) {

// 【代碼5】

// //將i轉(zhuǎn)換為char類型，執(zhí)行people.printLetter()方法，如果出現(xiàn)異常則捕獲，并輸出異常的錯誤信息！

people.printLetter((char) i);

}

for (int i = 0; i 128; i++) {

// 【代碼6】 //將i轉(zhuǎn)換為char類型，執(zhí)行people. printDigit

// ()方法，如果出現(xiàn)異常則捕獲，并輸出異常的錯誤信息！

people.printDigit((char) i);

}

}

}