Question

I would like to know how to check if a file exists in the directory or if the name of the file typed in by the user matches what is in the directory and if it dont i out put a certain msg.. I am using FileDialog. That is if the user types in the name of a file it loops through the directory for a file with that name. If no match is found then a message should be printed.

    FileDialog fileWindow = 
       new FileDialog(new Frame(), "Tash & David s File Founder System");
    fileWindow.setVisible(true);

    if (fileWindow.getFile() != null) {         
        File fileDirectory = new File(fileWindow.getDirectory());           
        String[] Directory = fileDirectory.list();          
        for (; i < Directory.length; i++) {                         
            if(Directory[i].startsWith(fileWindow.getFile())){              
                System.out.print("yes");                                    
            }                            
        }                       
    }
    else
        JOptionPane.showConfirmDialog(null, "Are you Sure");
    }

Answer 1

use exist() method. Read more

Answer 2

使用<代码>exists(方法。

一种方法:java.io.File.exists()

另一种方法:java.nio.file.Path.exists()

简单的谷歌搜索通常将结果引向容易的问题,例如:

Edit: For simplicity (added all the code to check a file exists in the if()):

FileDialog fileWindow = 
   new FileDialog(new Frame(), "Tash & David s File Founder System");
fileWindow.setVisible(true);

if (fileWindow.getFile() != null && new File(fileWindow.getDirectory()+File.separator+fileWindow.getFile()).exists()) {
    File fileDirectory = new File(fileWindow.getDirectory());           
    String[] Directory = fileDirectory.list();          
    for (; i < Directory.length; i++) {                         
        if(Directory[i].startsWith(fileWindow.getFile())){              
            System.out.print("yes");                                    
        }                            
    }                       
}
else
    JOptionPane.showConfirmDialog(null, "Are you Sure");
}

你可以选择,但你可以看到,需要做些什么来检查档案的存在。让我知道它是否发挥作用,并选择它作为适当的答案:

友情链接