Java file limits

And a String is an Array of chars. This is why the method writes all the chars from position 0 to 31 to the file. This results in a file with 32 x 1 Bytes depending on the encoding. Does there really get information lost? Add a comment. Use the stream to limit the file size, don't rely on file. Kayaman Kayaman Sign up or log in Sign up using Google.

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Featured on Meta. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How to set per-process limits? Ask Question. Asked 1 year, 5 months ago. Active 10 months ago. Viewed 1k times. Java service is run by a user tomcat. Apache is run by root. This directs traffic to either the node or Spring Boot services. The result of some relevant commands on my system However I don't know of any OS which supports file names of this length.

The uniform system limit if any for the length of an entire file name that is, the argument given to system calls such as open , including the terminating null character.

The value of this macro is an integer constant expression that represents the maximum length of a file name string. It is defined in stdio. In such a case, its value is typically a very large number. You can't possibly make an array that big! Use dynamic allocation see Memory Allocation instead. So, Java has no limit - except the max length of a String - since the underlying system hasn't.

For example, on Mac OS Yosemite maximum path length is symbols, while maximum file name is symbols. If you exceed this limit, Java NIO will throw an exception. Since file name is a String and length and position methods return an int, I'd say the maximum is Integer.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. The access permissions on an object may cause some methods in this class to fail. Instances of the File class are immutable; that is, once created, the abstract pathname represented by a File object will never change.

Interoperability with java. This API may be used to overcome many of the limitations of the java. File class. The toPath method may be used to obtain a Path that uses the abstract path represented by a File object to locate a file. Since: JDK1. Constructor Summary Constructors Constructor and Description File File parent, String child Creates a new File instance from a parent abstract pathname and a child pathname string.

File String pathname Creates a new File instance by converting the given pathname string into an abstract pathname. File String parent, String child Creates a new File instance from a parent pathname string and a child pathname string. Method Summary Methods Modifier and Type Method and Description boolean canExecute Tests whether the application can execute the file denoted by this abstract pathname.

File getAbsoluteFile Returns the absolute form of this abstract pathname. String getAbsolutePath Returns the absolute pathname string of this abstract pathname. File getCanonicalFile Returns the canonical form of this abstract pathname. String getCanonicalPath Returns the canonical pathname string of this abstract pathname. String getName Returns the name of the file or directory denoted by this abstract pathname.

String getParent Returns the pathname string of this abstract pathname's parent, or null if this pathname does not name a parent directory. File getParentFile Returns the abstract pathname of this abstract pathname's parent, or null if this pathname does not name a parent directory. String getPath Converts this abstract pathname into a pathname string. String [] list Returns an array of strings naming the files and directories in the directory denoted by this abstract pathname.

String [] list FilenameFilter filter Returns an array of strings naming the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.

File [] listFiles Returns an array of abstract pathnames denoting the files in the directory denoted by this abstract pathname. File [] listFiles FileFilter filter Returns an array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter. File [] listFiles FilenameFilter filter Returns an array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.

Path toPath Returns a java. Path object constructed from the this abstract path. String toString Returns the pathname string of this abstract pathname. This method does not automatically escape characters that are illegal in URLs. Methods inherited from class java. Object clone , finalize , getClass , notify , notifyAll , wait , wait , wait Field Detail separatorChar public static final char separatorChar The system-dependent default name-separator character.

This field is initialized to contain the first character of the value of the system property file. See Also: System. String separator public static final String separator The system-dependent default name-separator character, represented as a string for convenience. This string contains a single character, namely separatorChar. This field is initialized to contain the first character of the value of the system property path.

This character is used to separate filenames in a sequence of files given as a path list. String pathSeparator public static final String pathSeparator The system-dependent path-separator character, represented as a string for convenience. This string contains a single character, namely pathSeparatorChar. Constructor Detail File public File String pathname Creates a new File instance by converting the given pathname string into an abstract pathname.

If the given string is the empty string, then the result is the empty abstract pathname. Parameters: pathname - A pathname string Throws: NullPointerException - If the pathname argument is null File public File String parent, String child Creates a new File instance from a parent pathname string and a child pathname string.

If parent is null then the new File instance is created as if by invoking the single-argument File constructor on the given child pathname string. Otherwise the parent pathname string is taken to denote a directory, and the child pathname string is taken to denote either a directory or a file. If the child pathname string is absolute then it is converted into a relative pathname in a system-dependent way.

If parent is the empty string then the new File instance is created by converting child into an abstract pathname and resolving the result against a system-dependent default directory. Otherwise each pathname string is converted into an abstract pathname and the child abstract pathname is resolved against the parent. Parameters: parent - The parent pathname string child - The child pathname string Throws: NullPointerException - If child is null File public File File parent, String child Creates a new File instance from a parent abstract pathname and a child pathname string.

Otherwise the parent abstract pathname is taken to denote a directory, and the child pathname string is taken to denote either a directory or a file. If parent is the empty abstract pathname then the new File instance is created by converting child into an abstract pathname and resolving the result against a system-dependent default directory. The exact form of a file: URI is system-dependent, hence the transformation performed by this constructor is also system-dependent.

For a given abstract pathname f it is guaranteed that new File f. This relationship typically does not hold, however, when a file: URI that is created in a virtual machine on one operating system is converted into an abstract pathname in a virtual machine on a different operating system. Parameters: uri - An absolute, hierarchical URI with a scheme equal to "file" , a non-empty path component, and undefined authority, query, and fragment components Throws: NullPointerException - If uri is null IllegalArgumentException - If the preconditions on the parameter do not hold Since: 1.

This is just the last name in the pathname's name sequence. If the pathname's name sequence is empty, then the empty string is returned. Returns: The name of the file or directory denoted by this abstract pathname, or the empty string if this pathname's name sequence is empty getParent public String getParent Returns the pathname string of this abstract pathname's parent, or null if this pathname does not name a parent directory. The parent of an abstract pathname consists of the pathname's prefix, if any, and each name in the pathname's name sequence except for the last.

If the name sequence is empty then the pathname does not name a parent directory. Returns: The pathname string of the parent directory named by this abstract pathname, or null if this pathname does not name a parent getParentFile public File getParentFile Returns the abstract pathname of this abstract pathname's parent, or null if this pathname does not name a parent directory.

Returns: The abstract pathname of the parent directory named by this abstract pathname, or null if this pathname does not name a parent Since: 1. The resulting string uses the default name-separator character to separate the names in the name sequence. Returns: The string form of this abstract pathname isAbsolute public boolean isAbsolute Tests whether this abstract pathname is absolute.

The definition of absolute pathname is system dependent. Returns: true if this abstract pathname is absolute, false otherwise getAbsolutePath public String getAbsolutePath Returns the absolute pathname string of this abstract pathname. If this abstract pathname is already absolute, then the pathname string is simply returned as if by the getPath method.

If this abstract pathname is the empty abstract pathname then the pathname string of the current user directory, which is named by the system property user. Otherwise this pathname is resolved in a system-dependent way. On UNIX systems, a relative pathname is made absolute by resolving it against the current user directory.

On Microsoft Windows systems, a relative pathname is made absolute by resolving it against the current directory of the drive named by the pathname, if any; if not, it is resolved against the current user directory. Returns: The absolute pathname string denoting the same file or directory as this abstract pathname Throws: SecurityException - If a required system property value cannot be accessed.

Equivalent to new File this. Returns: The absolute abstract pathname denoting the same file or directory as this abstract pathname Throws: SecurityException - If a required system property value cannot be accessed.

Since: 1. A canonical pathname is both absolute and unique. The precise definition of canonical form is system-dependent. This method first converts this pathname to absolute form if necessary, as if by invoking the getAbsolutePath method, and then maps it to its unique form in a system-dependent way. This typically involves removing redundant names such as ". Every pathname that denotes an existing file or directory has a unique canonical form.

Every pathname that denotes a nonexistent file or directory also has a unique canonical form. The canonical form of the pathname of a nonexistent file or directory may be different from the canonical form of the same pathname after the file or directory is created. Similarly, the canonical form of the pathname of an existing file or directory may be different from the canonical form of the same pathname after the file or directory is deleted.

FileDescriptor method denies read access to the file Since: 1. Converts this abstract pathname into a file: URL. The exact form of the URL is system-dependent.