《Java编程思想第4版[中文版](PDF格式)》第266章


Pr。error(〃could not open 〃 + f);

return in;

static BufferedReader disOpen(String fname) {
return disOpen(new File(fname));

static DataOutputStream dosOpen(File f) {
DataOutputStream in = null;
try {
in = new DataOutputStream(
new BufferedOutputStream(
new FileOutputStream(f)));
} catch(IOException e) {
Pr。error(〃could not open 〃 + f);

return in;

static DataOutputStream dosOpen(String fname) {
return dosOpen(new File(fname));

static PrintWriter psOpen(File f) {
PrintWriter in = null;
try {
in = new PrintWriter(
new BufferedWriter(
new FileWriter(f)));
} catch(IOException e) {
Pr。error(〃could not open 〃 + f);
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return in;

static PrintWriter psOpen(String fname) {
return psOpen(new File(fname));

static void close(Writer os) {
try {
os。close();
} catch(IOException e) {
Pr。error(〃closing 〃 + os);


static void close(DataOutputStream os) {
try {
os。close();
} catch(IOException e) {
Pr。error(〃closing 〃 + os);


static void close(Reader os) {
try {
os。close();
} catch(IOException e) {
Pr。error(〃closing 〃 + os);



class SourceCodeFile {
public static final String
startMarker = 〃//:〃; // Start of source file
endMarker = 〃} ///:~〃; // End of source
endMarker2 = 〃}; ///:~〃; // C++ file end
beginContinue = 〃} ///:Continued〃;
endContinue = 〃///:Continuing〃;
packMarker = 〃###〃; // Packed file header tag
eol = // Line separator on current system
System。getProperty(〃line。separator〃);
filesep = // System"s file path separator
System。getProperty(〃file。separator〃);
public static String copyright = 〃〃;
static {
try {
BufferedReader cr =
new BufferedReader(
new FileReader(〃Copyright。txt〃));
String crin;
while((crin = cr。readLine()) != null)
copyright += crin + 〃n〃;
cr。close();
} catch(Exception e) {
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…………………………………………………………Page 626……………………………………………………………
copyright = 〃〃;


private String filename; dirname;
contents = new String();
private static String chapter = 〃c02〃;
// The file name separator from the old system:
public static String oldsep;
public String toString() {
return dirname + filesep + filename;

// Constructor for parsing from document file:
public SourceCodeFile(String firstLine;
BufferedReader in) {
dirname = chapter;
// Skip past marker:
filename = firstLine。substring(
startMarker。length())。trim();
// Find space that terminates file name:
if(filename。indexOf(" ") != …1)
filename = filename。substring(
0; filename。indexOf(" "));
System。out。println(〃found: 〃 + filename);
contents = firstLine + eol;
if(copyright。length() != 0)
contents += copyright + eol;
String s;
boolean foundEndMarker = false;
try {
while((s = in。readLine()) != null) {
if(s。startsWith(startMarker))
Pr。error(〃No end of file marker for 〃 +
filename);
// For this program; no spaces before
// the 〃package〃 keyword are allowed
// in the input source code:
else if(s。startsWith(〃package〃)) {
// Extract package name:
String pdir = s。substring(
s。indexOf(" "))。trim();
pdir = pdir。substring(
0; pdir。indexOf(";"))。trim();
// Capture the chapter from the package
// ignoring the "" subdirectories:
if(!pdir。startsWith(〃〃)) {
int firstDot = pdir。indexOf("。");
if(firstDot != …1)
chapter =
pdir。substring(0;firstDot);
else
chapter = pdir;

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…………………………………………………………Page 627……………………………………………………………
// Convert package name to path name:
pdir = pdir。replace(
"。"; filesep。charAt(0));
System。out。println(〃package 〃 + pdir);
dirname = pdir;

contents += s + eol;
// Move past continuations:
if(s。startsWith(beginContinue))
while((s = in。readLine()) != null)
if(s。startsWith(endContinue)) {
contents += s + eol;
break;

// Watch for end of code listing:
if(s。startsWith(endMarker) ||
s。startsWith(endMarker2)) {
foundEndMarker = true;
break;


if(!foundEndMarker)
Pr。error(
〃End marker not found before EOF〃);
System。out。println(〃Chapter: 〃 + chapter);
} catch(IOException e) {
Pr。error(〃Error reading line〃);


// For recovering from a packed file:
public SourceCodeFile(BufferedReader pFile) {
try {
String s = pFile。readLine();
if(s == null) return;
if(!s。startsWith(packMarker))
Pr。error(〃Can"t find 〃 + packM
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