java檔案操作 java程式設計思想

//這是乙個典型的從檔案讀取然後寫入檔案的方法

file filedir = new file("c://temp//child" + file.separatorchar);

if (!filedir.isdirectory()) else

file fileold = new file(filedir.getpath() + file.separatorchar

+ "buffer.txt");

file file = new file(filedir.getpath() + file.separatorchar

+ "buffer1.txt");

bufferedreader in = new bufferedreader(new filereader(fileold));

printwriter out = new printwriter(new bufferedwriter(new filewriter(file,true)));

int count = 1;

string s;

while((s=in.readline())!=null)

out.close();

//當輸出可供另乙個stream的情況.txt

file filedir = new file("c://temp//child" + file.separatorchar);

if (!filedir.isdirectory()) else

file fileold = new file(filedir.getpath() + file.separatorchar

+ "buffer.txt");

file file = new file(filedir.getpath() + file.separatorchar

+ "buffer1.txt");

dataoutputstream out = new dataoutputstream(new bufferedoutputstream(new fileoutputstream(file)));

out.writedouble(3.14159);

string s = "中國";

out.write(s.getbytes(),0,s.getbytes().length);

//out.writechars("中國this is the value of pi/n");

out.writebytes("this is the value of pi/n");

out.writebytes("this is the value of pi/2/n");

//out.writedouble(3.14159/2);

out.close();

datainputstream in = new datainputstream(new bufferedinputstream(new fileinputstream(file)));

bufferedreader inbr = new bufferedreader(new inputstreamreader(in));

system.out.println(in.readdouble());

system.out.println(inbr.readline());

system.out.println(inbr.readline());

//system.out.println(inbr.readline());

//system.out.println(in.readdouble());

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