Java Util.toString方法代码示例

import org.apache.harmony.luni.util.Util; //导入方法依赖的package包/类
/**
 * Answers an array of Strings representing the file names in the directory
 * represented by this File. If this File is not a directory the result is
 * <code>null</code>.
 * <p>
 * The entries <code>.</code> and <code>..</code> representing current
 * directory and parent directory are not returned as part of the list.
 * 
 * @return an array of Strings or <code>null</code>.
 * 
 * @see #getPath
 * @see #isDirectory
 * @see java.lang.SecurityManager#checkRead(FileDescriptor)
 */
public java.lang.String[] list() {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
        security.checkRead(path);
    }
    if (!isDirectory()) {
        return null;
    }
    byte[][] implList = listImpl(properPath(true));
    if (implList == null) {
        return new String[0];
    }
    String result[] = new String[implList.length];
    for (int index = 0; index < implList.length; index++) {
        result[index] = Util.toString(implList[index]);
    }
    return result;
}
 

import org.apache.harmony.luni.util.Util; //导入方法依赖的package包/类
/**
 * Answers an array of Files representing the file names in the directory
 * represented by this File that match a specific filter. If this File is
 * not a directory the result is <code>null</code>. If the filter is
 * <code>null</code> then all filenames match.
 * <p>
 * The entries <code>.</code> and <code>..</code> representing current
 * directory and parent directory are not returned as part of the list.
 * 
 * @param filter
 *            the filter to match names to or <code>null</code>.
 * @return an array of Files or <code>null</code>.
 * 
 * @see #getPath
 * @see #isDirectory
 * @see java.lang.SecurityManager#checkRead(FileDescriptor)
 */
public File[] listFiles(FileFilter filter) {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
        security.checkRead(path);
    }
    if (!isDirectory()) {
        return null;
    }
    byte[][] implList = listImpl(properPath(true));
    if (implList == null) {
        return new File[0];
    }
    List<File> tempResult = new ArrayList<File>();
    for (int index = 0; index < implList.length; index++) {
        String aName = Util.toString(implList[index]);
        File aFile = new File(this, aName);
        if (filter == null || filter.accept(aFile)) {
            tempResult.add(aFile);
        }
    }
    return tempResult.toArray(new File[tempResult.size()]);
}
 

import org.apache.harmony.luni.util.Util; //导入方法依赖的package包/类
/**
 * Lists the file system roots. The Java platform may support zero or more
 * file systems, each with its own platform-dependent root. Further, the
 * canonical pathname of any file on the system will always begin with one
 * of the returned file system roots.
 * 
 * @return the array of file system roots.
 */
public static File[] listRoots() {
    byte[][] rootsList = rootsImpl();
    if (rootsList == null) {
        return new File[0];
    }
    File result[] = new File[rootsList.length];
    for (int i = 0; i < rootsList.length; i++) {
        result[i] = new File(Util.toString(rootsList[i]));
    }
    return result;
}
 

import org.apache.harmony.luni.util.Util; //导入方法依赖的package包/类
/**
 * Gets a list of the files in the directory represented by this file. This
 * list is then filtered through a FileFilter and matching files are
 * returned as an array of files. Returns {@code null} if this file is not a
 * directory. If {@code filter} is {@code null} then all files match.
 * <p>
 * The entries {@code .} and {@code ..} representing the current and parent
 * directories are not returned as part of the list.
 *
 * @param filter
 *            the filter to match names against, may be {@code null}.
 * @return an array of files or {@code null}.
 * @throws SecurityException
 *             if a {@code SecurityManager} is installed and it denies read
 *             access to this file.
 * @see #getPath
 * @see #isDirectory
 * @see java.lang.SecurityManager#checkRead(FileDescriptor)
 */
public File[] listFiles(FileFilter filter) {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
        security.checkRead(path);
    }

    if (path.length() == 0) {
        return null;
    }

    byte[] bs = properPath(true);
    if (!isDirectoryImpl(bs) || !existsImpl(bs) || isWriteOnlyImpl(bs)) {
        return null;
    }

    byte[][] implList = listImpl(bs);
    if (implList == null) {
        return new File[0];
    }
    List<File> tempResult = new ArrayList<File>();
    for (int index = 0; index < implList.length; index++) {
        String aName = Util.toString(implList[index]);
        File aFile = new File(this, aName);
        if (filter == null || filter.accept(aFile)) {
            tempResult.add(aFile);
        }
    }
    return tempResult.toArray(new File[tempResult.size()]);
}
 

import org.apache.harmony.luni.util.Util; //导入方法依赖的package包/类
/**
 * Gets a list of the files in the directory represented by this file. This
 * list is then filtered through a FilenameFilter and the names of files
 * with matching names are returned as an array of strings. Returns
 * {@code null} if this file is not a directory. If {@code filter} is
 * {@code null} then all filenames match.
 * <p>
 * The entries {@code .} and {@code ..} representing the current and parent
 * directories are not returned as part of the list.
 * 
 * @param filter
 *            the filter to match names against, may be {@code null}.
 * @return an array of files or {@code null}.
 * @throws SecurityException
 *             if a {@code SecurityManager} is installed and it denies read
 *             access to this file.
 * @see #getPath
 * @see #isDirectory
 * @see java.lang.SecurityManager#checkRead(FileDescriptor)
 */
public java.lang.String[] list(FilenameFilter filter) {
    SecurityManager security = System.getSecurityManager();
    if (security != null) {
        security.checkRead(path);
    }

    if (path.length() == 0) {
        return null;
    }

    byte[] bs = properPath(true);
    if (!isDirectoryImpl(bs) || !existsImpl(bs) || isWriteOnlyImpl(bs)) {
        return null;
    }

    byte[][] implList = listImpl(bs);
    if (implList == null) {
        // empty list
        return new String[0];
    }
    List<String> tempResult = new ArrayList<String>();
    for (int index = 0; index < implList.length; index++) {
        String aName = Util.toString(implList[index]);
        if (filter == null || filter.accept(this, aName)) {
            tempResult.add(aName);
        }
    }

    return tempResult.toArray(new String[tempResult.size()]);
}
 

import org.apache.harmony.luni.util.Util; //导入方法依赖的package包/类
/**
 * Lists the filesystem roots.
 * 
 * The Java platform may support zero or more filesystems, each with its own
 * platform-dependent root. Further, the canonical pathname of any file on
 * the system will always begin with one of the returned filesystem roots.
 * 
 * @return the array of filesystem roots
 */
public static File[] listRoots() {
    byte[][] rootsList = rootsImpl();
    if (rootsList == null) {
        return new File[0];
    }
    File result[] = new File[rootsList.length];
    for (int i = 0; i < rootsList.length; i++) {
        result[i] = new File(Util.toString(rootsList[i]));
    }
    return result;
}
 

import org.apache.harmony.luni.util.Util; //导入方法依赖的package包/类
/**
 * Answers the absolute file path of this File.
 * 
 * @return the absolute file path
 * 
 * @see java.lang.SecurityManager#checkPropertyAccess
 */
public String getAbsolutePath() {
    byte[] absolute = properPath(false);
    return Util.toString(absolute);
}