list.foreach(system.out::print）如何使用tostring

如果你想在 `foreach` 方法中使用 `toString` 方法，你可以使用 lambda 表达式来实现：

list.forEach(item -> System.out.print(item.toString()));

或者你可以使用方法引用，但需要调用 `toString` 方法：

list.forEach(System.out::print);

在这种情况下，`System.out.print` 方法将自动调用每个元素的 `toString` 方法，因为 `println` 方法需要将每个元素转换为字符串。

相关问题

将以下代码转成python的代码 private static void fileRename(String newFileName, String folder) { File file = new File(folder); System.out.println("Reading this " + file.toString()); if (file.isDirectory()) { File[] files = file.listFiles(); List<File> filelist = Arrays.asList(files); filelist.forEach(f -> { System.out.println(f.getAbsolutePath()); String newName = folder + newFileName; System.out.println(newName); boolean isRenamed = f.renameTo(new File(newName)); if (isRenamed) System.out.println(String.format("Renamed this file %s to %s", f.getName(), newName)); else System.out.println(String.format("%s file is not renamed to %s", f.getName(), newName)); }); }

import os

def file_rename(new_file_name: str, folder: str):
    file = os.path.join(folder)
    print("Reading this " + file)
    if os.path.isdir(file):
        files = os.listdir(file)
        for f in files:
            print(os.path.abspath(f))
            new_name = os.path.join(folder, new_file_name)
            print(new_name)
            is_renamed = os.rename(f, new_name)
            if is_renamed:
                print(f"Renamed this file {f} to {new_name}")
            else:
                print(f"{f} file is not renamed to {new_name}")