Java 快捷文件處理類：InFile、PrintFile、OutFile

動機

標準 IO 鏈式構造冗長（如 new DataInputStream(new BufferedInputStream(new FileInputStream(...)))），封裝為單一類簡化使用。

InFile - 輸入快捷類

public class InFile extends DataInputStream {
    public InFile(String filename) throws FileNotFoundException {
        super(new BufferedInputStream(new FileInputStream(filename)));
    }
    public InFile(File file) throws FileNotFoundException {
        this(file.getPath());
    }
}

PrintFile - 格式化輸出快捷類

public class PrintFile extends PrintStream {
    public PrintFile(String filename) throws IOException {
        super(new BufferedOutputStream(new FileOutputStream(filename)));
    }
    public PrintFile(File file) throws IOException {
        this(file.getPath());
    }
}

OutFile - 數據輸出快捷類

public class OutFile extends DataOutputStream {
    public OutFile(String filename) throws IOException {
        super(new BufferedOutputStream(new FileOutputStream(filename)));
    }
    public OutFile(File file) throws IOException {
        this(file.getPath());
    }
}

使用示例

InFile in = new InFile("test.txt");
String line = in.readLine();
PrintFile out = new PrintFile("out.txt");
out.println("Hello");
OutFile data = new OutFile("data.bin");
data.writeDouble(3.14);