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java代码程序二千行 java有多少行代码
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一个java文件里面最多写多少行代码？
hotspot 虚拟机（咱们平时开发用的sun公司的虚拟机，其他两大商用虚拟机是BEA的JRockit和IBM的J9）里面两个字节来限制大小，所以最多65536行，超过javac会无法编译。而且一个Java方法不能超过64k。一般一个Java类不要有太多行数，如果一个Java代码超过几千甚至过万，个人觉得应该考虑一些代码优化方式，比如继承；或者重新构思这个类。代码行数太多可读性查，不利于维护。
相关问答
Q1: 求一个200行以上的Java小程序代码
有个匿名网友的代码，很好，很强大
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
class Calculator extends JFrame implements ActionListener {
private final String[] KEYS = { "7", "8", "9", "/", "sqrt", "4", "5", "6",
"*", "%", "1", "2", "3", "-", "1/x", "0", "+/-", ".", "+", "=" };
private final String[] COMMAND = { "Backspace", "CE", "C" };
private final String[] M = { " ", "MC", "MR", "MS", "M+" };
private JButton keys[] = new JButton[KEYS.length];
private JButton commands[] = new JButton[COMMAND.length];
private JButton m[] = new JButton[M.length];
private JTextField resultText = new JTextField("0");
private boolean firstDigit = true;
private double resultNum = 0.0;
private String operator = "=";
private boolean operateValidFlag = true;
public Calculator(){
super();
init();
this.setBackground(Color.LIGHT_GRAY);
this.setTitle("计算器");
this.setLocation(500, 300);
this.setResizable(false);
this.pack();
}
private void init() {
resultText.setHorizontalAlignment(JTextField.RIGHT);
resultText.setEditable(false);
resultText.setBackground(Color.WHITE);
JPanel calckeysPanel = new JPanel();
calckeysPanel.setLayout(new GridLayout(4, 5, 3, 3));
for (int i = 0; i KEYS.length; i++) {
keys[i] = new JButton(KEYS[i]);
calckeysPanel.add(keys[i]);
keys[i].setForeground(Color.blue);
}
keys[3].setForeground(Color.red);
keys[8].setForeground(Color.red);
keys[13].setForeground(Color.red);
keys[18].setForeground(Color.red);
keys[19].setForeground(Color.red);
JPanel commandsPanel = new JPanel();
commandsPanel.setLayout(new GridLayout(1, 3, 3, 3));
for (int i = 0; i COMMAND.length; i++) {
commands[i] = new JButton(COMMAND[i]);
commandsPanel.add(commands[i]);
commands[i].setForeground(Color.red);
}
JPanel calmsPanel = new JPanel();
calmsPanel.setLayout(new GridLayout(5, 1, 3, 3));
for (int i = 0; i M.length; i++) {
m[i] = new JButton(M[i]);
calmsPanel.add(m[i]);
m[i].setForeground(Color.red);
}
JPanel panel1 = new JPanel();
panel1.setLayout(new BorderLayout(3, 3));
panel1.add("North", commandsPanel);
panel1.add("Center", calckeysPanel);
JPanel top = new JPanel();
top.setLayout(new BorderLayout());
top.add("Center", resultText);
getContentPane().setLayout(new BorderLayout(3, 5));
getContentPane().add("North", top);
getContentPane().add("Center", panel1);
getContentPane().add("West", calmsPanel);
for (int i = 0; i KEYS.length; i++) {
keys[i].addActionListener(this);
}
for (int i = 0; i COMMAND.length; i++) {
commands[i].addActionListener(this);
}
for (int i = 0; i M.length; i++) {
m[i].addActionListener(this);
}
}
public void actionPerformed(ActionEvent e) {
String label = e.getActionCommand();
if (label.equals(COMMAND[0])){
handleBackspace();
} else if (label.equals(COMMAND[1])) {
resultText.setText("0");
} else if (label.equals(COMMAND[2])){
handleC();
} else if ("0123456789.".indexOf(label) = 0) {
handleNumber(label);
} else {
handleOperator(label);
}
}
private void handleBackspace() {
String text = resultText.getText();
int i = text.length();
if (i 0) {
text = text.substring(0, i - 1);
if (text.length() == 0) {
resultText.setText("0");
firstDigit = true;
operator = "=";
} else {
resultText.setText(text);
}
}
}
private void handleNumber(String key) {
if (firstDigit) {
resultText.setText(key);
} else if ((key.equals(".")) (resultText.getText().indexOf(".") 0)){
resultText.setText(resultText.getText() + ".");
} else if (!key.equals(".")) {
resultText.setText(resultText.getText() + key);
}
firstDigit = false;
}
private void handleC() {
resultText.setText("0");
firstDigit = true;
operator = "=";
}
private void handleOperator(String key) {
if (operator.equals("/")) {
if (getNumberFromText() == 0.0){
operateValidFlag = false;
resultText.setText("除数不能为零");
} else {
resultNum /= getNumberFromText();
}
} else if (operator.equals("1/x")) {
if (resultNum == 0.0){
operateValidFlag = false;
resultText.setText("零没有倒数");
} else {
resultNum = 1 / resultNum;
}
} else if (operator.equals("+")){
resultNum += getNumberFromText();
} else if (operator.equals("-")){
resultNum -= getNumberFromText();
} else if (operator.equals("*")){
resultNum *= getNumberFromText();
} else if (operator.equals("sqrt")) {
resultNum = Math.sqrt(resultNum);
} else if (operator.equals("%")){
resultNum = resultNum / 100;
} else if (operator.equals("+/-")){
resultNum = resultNum * (-1);
} else if (operator.equals("=")){
resultNum = getNumberFromText();
}
if (operateValidFlag) {
long t1;
double t2;
t1 = (long) resultNum;
t2 = resultNum - t1;
if (t2 == 0) {
resultText.setText(String.valueOf(t1));
} else {
resultText.setText(String.valueOf(resultNum));
}
}
operator = key;
firstDigit = true;
operateValidFlag = true;
}
private double getNumberFromText() {
double result = 0;
try {
result = Double.valueOf(resultText.getText()).doubleValue();
} catch (NumberFormatException e){
}
return result;
}
public static void main(String args[]) {
Calculator calculator1 = new Calculator();
calculator1.setVisible(true);
calculator1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
Q2: 用C++或Java编辑2000行程序是什么概念
2000行已经很大了, 可以有很实用的功能了.
通常要切成很多个 class.
各class中要含与许多个 function.
Q3: Java代码可以超过2000行
以1000行为准java代码程序二千行，超过千行就要考虑类拆分java代码程序二千行了。
对于经常使用的java类java代码程序二千行，代码行数应该尽可能的少java代码程序二千行，这样能减少java类的加载时间java代码程序二千行，减少内存频繁占用和回收。如果类过大，java类加载会耗时并且占用内存大。容易引起内存回收。
如果前期准备得当，设计，建模合理。一般来说，每个类的代码就不会很多，几百行。很早之前看过有前辈说，300行之内。
Q4: 一个普通的JAVA程序员 一个月代码量大概是多少？
我属于单休，其实项目刚开始做，代码没什么难度，主要是得边做边理解业务，业务才是最难学的，尤其是新项目，大项目。代码量吗，我是单休那种，项目紧，有时候一周下来也有一千多行了
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