e017. getting the parents of a filename path.txt

这里面包含了一百多个JAVA源文件

// Get the parent of a relative filename path
    File file = new File("Ex1.java");
    String parentPath = file.getParent();      // null
    File parentDir = file.getParentFile();     // null
    
    // Get the parents of an absolute filename path
    file = new File("D:\\almanac\\Ex1.java");
    parentPath = file.getParent();             // D:\almanac
    parentDir = file.getParentFile();          // D:\almanac
    
    parentPath = parentDir.getParent();        // D:\
    parentDir = parentDir.getParentFile();     // D:\
    
    parentPath = parentDir.getParent();        // null
    parentDir = parentDir.getParentFile();     // null