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關(guān)于java300行代碼的信息

一個java文件里面最多寫多少行代碼?

1,java規(guī)范中一般不建議一個java類中超過500行

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2,一行的長度不超過200個

3,按照規(guī)定格式將代碼格式化

一個java類標準代碼行數(shù)范圍大概是多少

以1000行為準,超過千行就要考慮類拆分了。

類的代碼行數(shù)沒有特定的行數(shù)限制規(guī)范。根據(jù)實際情況決定。

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類加載會耗時并且占用內(nèi)存大。容易引起內(nèi)存回收。

求java代碼300行左右,要有注釋,能運行,基礎(chǔ)點的越基礎(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);

}

}

}

誰幫我寫一段300行左右的代碼?

這個計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;

// 定義存放運算結(jié)果的區(qū)域

private Label answer;

// 用來實現(xiàn)運算功能的類的對象實例化

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)不同的按鈕事件進行不同的運算

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)運算時主界面的顯示

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:運行的是GUI程序

一個JAVA程序員一年寫多少條代碼

我曾經(jīng)最多一天寫過1500行代碼,如果正常情況下,一天應(yīng)該能寫500行,一年不休息差不多20萬行吧

java 項目 代碼行數(shù)多少 算大項目

java項目的大小衡量標準:

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

這樣的觀點是以代碼行作為計量標準的,認為代碼行多的自然項目也就大了。


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