Filehand
Presentation
•
Computers
•
9th - 12th Grade
•
Practice Problem
•
Easy
Arasaka Teacher
Used 3+ times
FREE Resource
1 Slide • 16 Questions
1
File
By Arasaka Teacher
2
Reorder
String name = "abc.txt";
File file = new File(name);
System.out.println(file.exists());
try {
// 使用 FileReader 打开文件
使用 BufferedReader 包装 FileReader，提高读取效率
// 用于存储从文件中读取的每一行内容
String line;
// 先读取一行
//条件是什么
{
// 输出当前行
System.out.println(line);
// 读取下一行
line = reader.readLine();
}
} ; // 处理异常
}
FileReader fileReader = new FileReader(file);
BufferedReader reader = new BufferedReader(fileReader);
line = reader.readLine();
while (line != null)
catch (IOException e) {
e.printStackTrace()
3
Drag and Drop
// 4. 将内容写入文件
4
Fill in the Blanks
5
Fill in the Blanks
6
Fill in the Blanks
7
Fill in the Blanks
8
Fill in the Blanks
9
Fill in the Blanks
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Fill in the Blanks
11
Fill in the Blanks
12
Fill in the Blanks
13
Reorder
Write several lines of text to the file.
DECLARE textLn : STRING
DECLARE myFile : STRING
myFile ← "myText.txt"
REPEAT
OUTPUT "Please enter a line of text"
IF textLn <> ""
THEN
ELSE
ENDIF
OUTPUT "The file contains these lines of text:"
OPEN myFile FOR WRITE
INPUT textLn
WRITEFILE myFile, textLn
CLOSEFILE(myFile)
UNTIL textLn = ""
14
Reorder
This example uses the operations together, to copy all the lines from FileA.txt to FileB.txt,
replacing any blank lines by a line of dashes.
DECLARE LineOfText : STRING
OPENFILE "FileA.txt" FOR READ
OPENFILE "FileB.txt" FOR WRITE
WHILE NOT EOF("FileA.txt")
READFILE "FileA.txt", LineOfText
IF LineOfText = "" THEN
WRITEFILE "FileB.txt", " ----------------------------"
ELSE
WRITEFILE "FileB.txt", LineOfText
ENDIF
ENDWHILE
CLOSEFILE "FileA.txt"
CLOSEFILE "FileB.txt"
15
Fill in the Blanks
16
Reorder
Reorder the following
OUTPUT "The file contains these lines of text:"
REPEAT
OPEN myTextFile FOR READ
READFILE, textIn
OUTPUT textIn
UNTIL EOF(myTextFile)
CLOSEFILE(myTextFile)
17
Reorder
Append a line of text at the end of the file.
DECLARE textIn : STRING
REPEAT
ELSE
OPEN myTextFile FOR APPEND
OUTPUT "Please enter a line of text"
INPUT textIn
IF textIn <> "" THEN
WRITEFILE, textIn
CLOSEFILE(myTextFile)
ENDIF
UNTIL textIn = ""
File
By Arasaka Teacher
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