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包含java程序代碼300行的詞條

Java程序代碼

第一個:

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import?java.util.Scanner;

/**

*?@author?zhangdong

*?@date?2018/4/24??16:14

*/

public?class?HomeWork1?{

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

System.out.println("請輸入一個數(shù)字(0-3)");

Scanner?scanner?=?new?Scanner(System.in);

int?num?=?scanner.nextInt();

switch?(num)?{

case?0:

System.out.println("0-?明天去打球");

break;

case?1:

System.out.println("1-?明天去跑步");

break;

case?2:

System.out.println("2-?明天去放鴨");

break;

case?3:

System.out.println("3-?明天去爬山");

break;

default:

System.out.println("其他-明天呆在家里");

break;

}

}

}

第二個:

import?java.util.Scanner;

/**

*?@author?zhangdong

*?@date?2018/4/24??16:18

*/

public?class?HomeWork2?{

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

System.out.println("請輸入一個數(shù)字(1-7)");

Scanner?scanner?=?new?Scanner(System.in);

int?num?=?scanner.nextInt();

switch?(num)?{

case?1:

System.out.println("星期一");

break;

case?2:

System.out.println("星期二");

break;

case?3:

System.out.println("星期三");

break;

case?4:

System.out.println("星期四");

break;

case?5:

System.out.println("星期五");

break;

case?6:

System.out.println("星期六");

break;

case?7:

System.out.println("星期日");

break;

default:

System.out.println("輸入錯誤!");

break;

}

}

}

第三個:

/**

*?@author?zhangdong

*?@date?2018/4/24??16:20

*/

public?class?Car?{

private?String?name;

private?String?color;

private?String?placeOrigin;

public?Car(String?name,?String?color,?String?placeOrigin)?{

this.name?=?name;

this.color?=?color;

this.placeOrigin?=?placeOrigin;

}

public?String?getName()?{

return?name;

}

public?void?setName(String?name)?{

this.name?=?name;

}

public?String?getColor()?{

return?color;

}

public?void?setColor(String?color)?{

this.color?=?color;

}

public?String?getPlaceOrigin()?{

return?placeOrigin;

}

public?void?setPlaceOrigin(String?placeOrigin)?{

this.placeOrigin?=?placeOrigin;

}

public?void?run()?{

System.out.println("汽車正在以50km/s的速度行駛中");

}

public?void?run(int?speed)?{

System.out.println("汽車正在以"?+?speed?+?"km/s的速度行駛中");

}

@Override

public?String?toString()?{

return?"汽車基本信息:"?+

"???車名:'"?+?name?+?'\''?+

"???顏色:'"?+?color?+?'\''?+

"???產(chǎn)地:'"?+?placeOrigin?+?'\''?+

'}';

}

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

Car?car?=?new?Car("法拉利",?"黑色",?"德國");

System.out.println(car.toString());

car.run();

car.run(80);

}

}

求java程序代碼,200行左右

/**

需求:獎客富翁游戲。

菜單為:

1.注冊用戶信息。填寫用戶名,密碼,電腦隨機(jī)輸出一個4位

數(shù)字作為會員卡號。提示用戶名,密碼,及會員卡號??蛇x擇第二步了

2.登陸。校驗(yàn)是否已注冊(是否存在會員卡號)。如果為空,

提示用戶不存在。

如果用戶名通過,密碼錯誤,提示用戶名和密碼不匹配。如果

驗(yàn)證成功結(jié)束。如果輸入的用戶名密碼均匹配,給出登陸成功提示。

可選擇第三步了。

3.先判斷用戶是否已登陸(是否存在會員卡)

詢問是否進(jìn)行抽獎,選Y,電腦隨機(jī)輸出5個4位

數(shù)字。如果其中有一個數(shù)字與用戶卡號相同,則為中獎,獎勵

人民幣為卡號數(shù)字的金額。否則,謝謝參與。程序退出。

*/

import?java.util.Scanner;

import?java.util.Random;

public?class?RichPerson?{

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

//?輸出菜單。

for?(int?a?=?0;?a??6;?a++)?{

System.out.print("*");

}

System.out.print("歡迎進(jìn)入獎客富翁系統(tǒng)");

for?(int?b?=?0;?b??6;?b++)?{

System.out.print("*");

}

System.out.print("\n\t\t1.注冊\n"?+?"\t\t2.登錄\n"?+?"\t\t3.抽獎\n");

for?(int?c?=?0;?c??31;?c++)?{

System.out.print("*");

}

//?輸出菜單結(jié)束。

int?caidan?=?0;//?操作菜單

String?name?=?null;//?會員注冊名字

String?myname?=?null;//?會員登錄名字

String?password?=?null;//?會員注冊密碼

String?mypassword?=?null;//?會員登錄密碼

int?number?=?0;//?會員卡號

//?int?luckynumber=0;//幸運(yùn)號碼

String?str?=?null;//?詢問是否重試

//?輸入數(shù)字選擇菜單。

Scanner?input?=?new?Scanner(System.in);

Random?output?=?new?Random();

do?{

System.out.println("\n請選擇菜單:");

caidan?=?input.nextInt();

switch?(caidan)?{

case?1:

System.out.println("歡迎注冊富翁,請依次輸入用戶名和密碼");

System.out.println("用戶名:");

name?=?input.next();

System.out.println("密碼:");

password?=?input.next();

//?隨機(jī)給出4位數(shù)的會員卡號

number?=?output.nextInt(8999)?+?1000;

System.out.println("注冊成功!您的用戶名:"?+?name?+?",密碼:"?+?password

+?",會員卡號:"?+?number?+?"。請牢記!");

break;

case?2:

//?先判斷用戶是否已注冊。

if?(name?==?null)?{

System.out.println("您好,請先注冊!");

break;

}?else?{

System.out.println("歡迎登錄富翁,請依次輸入用戶名和密碼!");

//?用戶名和密碼匹配校驗(yàn)次數(shù)設(shè)置為3次。

for?(int?x?=?0;?x??3;?x++)?{

System.out.println("用戶名:");

myname?=?input.next();

if?(!myname.equals(name))?{

System.out.println("用戶"?+?myname?+?"不存在!請重試,剩余次數(shù)"

+?(2?-?x)?+?"次!");

}?else?{

System.out.println("密碼:");

}

mypassword?=?input.next();

if?(!mypassword.equals(password))?{

System.out.println(myname?+?"密碼錯誤!"?+?"請重試,剩余次數(shù)"

+?(2?-?x)?+?"次!");

}?else?{

System.out.println("登陸成功!");

break;

}

}

}

break;

case?3:

//?判斷用戶是否已注冊,是否已登錄。

if?(mypassword?==?null)?{

System.out.println("您好,請先登錄!");

break;

}?else?if?(!mypassword.equals(password))?{

System.out.println("您好,請先重試登錄!");

break;

}?else?if?(mypassword.equals(password))?{

System.out.println("歡迎進(jìn)入富翁,請問是否進(jìn)行幸運(yùn)抽獎(y/n)?");

String?choujiang?=?input.next();

if?(choujiang.equals("y"))?{

int[]?luckynumber?=?new?int[5];

for?(int?m?=?0;?m??5;?m++)?{

luckynumber[m]?=?output.nextInt(8999)?+?1000;

}

for?(int?m?=?0;?m??5;?m++)?{

System.out.print(luckynumber[m]?+?"\t");

}

System.out.println("\n"?+?number);

for?(int?m?=?0;?m??5;?m++)?{

if?(number?==?luckynumber[m])?{

System.out.println("\n中獎!金額為:"?+?luckynumber);

break;

}?else?{

System.out.println("\n木有中獎!");

break;

}

}

誰幫我寫一段300行左右的代碼?

這個計(jì)算器可是我自己寫了好幾天才寫好的耶,你能在網(wǎng)上找到?

計(jì)算器:

// Calculator.java

public class Calculator {

private static final char NO_OP = '\0';

private static final char PLUS = '+';

private static final char SUBTRACT = '-';

private static final char MULTIPLY = '*';

private static final char DIVIDE = '/';

private float number1 = 0.0F;

//private float number2 = Float.NaN;

private char operator = NO_OP;

//等于運(yùn)算

public String opEquals(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = NO_OP;

number1 = result;

return Float.toString(result);

}

//加法運(yùn)算

public String opAdd(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = PLUS;

number1 = result;

return Float.toString(result);

}

//減法運(yùn)算

public String opSubtract(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = SUBTRACT;

number1 = result;

return Float.toString(result);

}

//乘法運(yùn)算

public String opMultiply(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = MULTIPLY;

number1 = result;

return Float.toString(result);

}

//除法運(yùn)算

public String opDivide(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = DIVIDE;

number1 = result;

return Float.toString(result);

}

//處理運(yùn)算符

private float performOperation(float number2) {

float result = 0.0F;

switch ( operator ) {

case PLUS:

result = number1 + number2;

break;

case SUBTRACT:

result = number1 - number2;

break;

case MULTIPLY:

result = number1 * number2;

break;

case DIVIDE:

result = number1 / number2;

break;

}

return result;

}

//將字符串類型轉(zhuǎn)換為浮點(diǎn)型

private static float parseNumber(String number) {

float real_number;

try {

real_number = Float.parseFloat(number);

} catch (NumberFormatException e) {

real_number = Float.NaN;

}

return real_number;

}

}

GUI程序:

// CalculatorGUI.java

import java.awt.*;

import java.awt.event.*;

public class CalculatorGUI {

// 定義按鈕

private Button key0, key1, key2, key3, key4;

private Button key5, key6, key7, key8, key9;

private Button keyequal, keyplus, keyminus;

private Button keyperiod, keymult, keydiv;

// 定義存放按鈕的區(qū)域

private Panel buttonArea;

// 定義存放運(yùn)算結(jié)果的區(qū)域

private Label answer;

// 用來實(shí)現(xiàn)運(yùn)算功能的類的對象實(shí)例化

private Calculator calculator;

private boolean readyForNextNumber;

public CalculatorGUI() {

calculator = new Calculator();

readyForNextNumber = true;

answer = new Label("0.0",Label.RIGHT);

key0 = new Button("0");

key1 = new Button("1");

key2 = new Button("2");

key3 = new Button("3");

key4 = new Button("4");

key5 = new Button("5");

key6 = new Button("6");

key7 = new Button("7");

key8 = new Button("8");

key9 = new Button("9");

keyequal = new Button("=");

keyplus = new Button("+");

keyminus = new Button("-");

keymult = new Button("*");

keydiv = new Button("/");

keyperiod = new Button(".");

buttonArea = new Panel();

}

public void launchFrame() {

buttonArea.setLayout(new GridLayout(4,4));

buttonArea.add(key7);

buttonArea.add(key8);

buttonArea.add(key9);

buttonArea.add(keyplus);

buttonArea.add(key4);

buttonArea.add(key5);

buttonArea.add(key6);

buttonArea.add(keyminus);

buttonArea.add(key1);

buttonArea.add(key2);

buttonArea.add(key3);

buttonArea.add(keymult);

buttonArea.add(key0);

buttonArea.add(keyperiod);

buttonArea.add(keyequal);

buttonArea.add(keydiv);

// 設(shè)置事件接收句柄

OpButtonHanlder op_handler = new OpButtonHanlder();

NumberButtonHanlder number_handler = new NumberButtonHanlder();

key0.addActionListener(number_handler);

key1.addActionListener(number_handler);

key2.addActionListener(number_handler);

key3.addActionListener(number_handler);

key4.addActionListener(number_handler);

key5.addActionListener(number_handler);

key6.addActionListener(number_handler);

key7.addActionListener(number_handler);

key8.addActionListener(number_handler);

key9.addActionListener(number_handler);

keyperiod.addActionListener(number_handler);

keyplus.addActionListener(op_handler);

keyminus.addActionListener(op_handler);

keymult.addActionListener(op_handler);

keydiv.addActionListener(op_handler);

keyequal.addActionListener(op_handler);

// 新建一個幀,并且加上消息監(jiān)聽

Frame f = new Frame("計(jì)算器");

f.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

f.setSize(200, 200);

f.add(answer, BorderLayout.NORTH);

f.add(buttonArea, BorderLayout.CENTER);

f.setVisible (true);

}

//響應(yīng)按鈕事件,并根據(jù)不同的按鈕事件進(jìn)行不同的運(yùn)算

private class OpButtonHanlder implements ActionListener {

public void actionPerformed(ActionEvent event) {

char operator = event.getActionCommand().charAt(0);

String result = "";

switch ( operator ) {

case '+':

result = calculator.opAdd(answer.getText());

break;

case '-':

result = calculator.opSubtract(answer.getText());

break;

case '*':

result = calculator.opMultiply(answer.getText());

break;

case '/':

result = calculator.opDivide(answer.getText());

break;

case '=':

result = calculator.opEquals(answer.getText());

break;

}

answer.setText(result);

readyForNextNumber = true;

}

}

//處理連續(xù)運(yùn)算時(shí)主界面的顯示

private class NumberButtonHanlder implements ActionListener {

public void actionPerformed(ActionEvent event) {

if ( readyForNextNumber ) {

answer.setText(event.getActionCommand());

readyForNextNumber = false;

} else {

answer.setText(answer.getText() + event.getActionCommand().charAt(0));

}

}

}

//主函數(shù),也是該應(yīng)用程序的執(zhí)行入口處

public static void main(String[] args) {

CalculatorGUI calcGUI = new CalculatorGUI();

calcGUI.launchFrame();

}

}

注意:運(yùn)行的是GUI程序

求java代碼300行左右,要有注釋,能運(yùn)行,基礎(chǔ)點(diǎn)的越基礎(chǔ)的越好,300行以上就好,不要太長的

300行能干啥啊,你還不如自己做做練習(xí)題。

package suoha;

import java.util.ArrayList;import java.util.Random;

public class MainFunction {

private ArrayListMyCard cards = new ArrayListMyCard();

private int[] cardNumArr = new int[52];

private int[] mycards = new int[5];

private int[] p1cards = new int[5];

public static void main(String[] args) {

MainFunction mainfunc = new MainFunction();

mainfunc.makeCards();

mainfunc.cardNumArr = mainfunc.shuffleCards(mainfunc.cardNumArr);

mainfunc.catchCards();

mainfunc.showAllCardsOfHand();

//mainfunc.printNums();

}

/**

* 洗牌

* @param cardNums

* @return

*/

private int[] shuffleCards(int[] cardNums){

int size = cardNums.length;

int[] returnNums = new int[size];

//System.out.println(cardNums[0]+"=========================");

Random rand = new Random();

for(int i=size-1;i0;i--){

int nextInt = rand.nextInt(i);

returnNums[size-1-i] = cardNums[nextInt];

cardNums[nextInt] = cardNums[i];

cardNums[i] = returnNums[size-1-i];

//System.out.println("suijishu:"+nextInt+"||zhi:"+returnNums[size-1-i]);

}

returnNums[size-1] = cardNums[0];

return returnNums;

}

/**

* 抓牌

*/

private void catchCards(){

for(int i=0;i5;i++){

mycards[i] = cardNumArr[2*i];

p1cards[i] = cardNumArr[2*i+1];

}

}

private void showAllCardsOfHand(){

System.out.print("你手中的牌是:||");

for(int i=0;i5;i++){

MyCard myCard = cards.get(mycards[i]-1);

System.out.print(myCard.toString()+"||");

}

System.out.println();

System.out.print("對家手中的牌是:||");

for(int i=0;i5;i++){

MyCard myCard = cards.get(p1cards[i]-1);

System.out.print(myCard.toString()+"||");

}

}

/**

* 顯示牌的順序

*/

private void printNums(){

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

System.out.print(cardNumArr[i]+",");

}

}

/**

* 制作卡片

*/

private void makeCards(){

for(int i=1;i=13;i++){

for(int j=1;j=4;j++){

//System.out.println((i-1)*4+j);

MyCard card = new MyCard((i-1)*4+j, j, i);

cardNumArr[(i-1)*4+j-1] = (i-1)*4+j;

cards.add(card);

}

// MyCard card1 = new MyCard((i-1)*4+1, 1, i);

// MyCard card2 = new MyCard((i-1)*4+2, 2, i);

// MyCard card3 = new MyCard((i-1)*4+3, 3, i);

// MyCard card4 = new MyCard((i-1)*4+4, 4, i);

// cards.add(card1);

// cards.add(card2);

// cards.add(card3);

// cards.add(card4);

}

}

}

java 項(xiàng)目 代碼行數(shù)多少 算大項(xiàng)目

java項(xiàng)目的大小衡量標(biāo)準(zhǔn):

微型:只是一個人,甚至是半日工作在幾天內(nèi)完成的軟件; ?

小型:一個人半年內(nèi)完成的?2000?行以內(nèi)的程序;

中型:?5?個人在?1?年多的時(shí)間內(nèi)完成的?5000-50000?行的程序;

大型:?5-10?人在兩年內(nèi)完成的?50000-100000?行的程序;

甚大型:?100-1000?人參加用?4-5?年完成的具有?100?,?0000?行的軟件項(xiàng)目;

極大型:?2000-5000?人參加,?10?年內(nèi)完成的?1000?萬行以內(nèi)的程序;

以上摘自:《軟件工程概論》???鄭人杰、殷人民編

這樣的觀點(diǎn)是以代碼行作為計(jì)量標(biāo)準(zhǔn)的,認(rèn)為代碼行多的自然項(xiàng)目也就大了。

Java代碼可以超過2000行

以1000行為準(zhǔn),超過千行就要考慮類拆分了。

對于經(jīng)常使用的java類,代碼行數(shù)應(yīng)該盡可能的少,這樣能減少java類的加載時(shí)間,減少內(nèi)存頻繁占用和回收。如果類過大,java類加載會耗時(shí)并且占用內(nèi)存大。容易引起內(nèi)存回收。

如果前期準(zhǔn)備得當(dāng),設(shè)計(jì),建模合理。一般來說,每個類的代碼就不會很多,幾百行。很早之前看過有前輩說,300行之內(nèi)。


分享名稱:包含java程序代碼300行的詞條
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