用Java编程实现：将图片“D:\\test.png”复制到”E:\\pics\\test.png”。编程实现：删除一个非空目录“D:\\java”。编程实现

：感谢您对我的提问，我可以帮您解答有关编程的问题。

以下是答案：

将图片“D:\\test.png”复制到”E:\\pics\\test.png”的Java程序实现代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyFileExample {
    public static void main(String[] args) {
        FileInputStream source = null;
        FileOutputStream destination = null;

        try {
            File file = new File("D:\\test.png");
            File dir = new File("E:\\pics");

            if (!dir.exists()) {
                dir.mkdir();
            }

            if (file.exists()) {
                source = new FileInputStream(file);

                destination = new FileOutputStream(dir.getAbsolutePath() + "\\test.png");
                byte[] buffer = new byte[1024];
                int length;

                while ((length = source.read(buffer)) > 0) {
                    destination.write(buffer, 0, length);
                }

                System.out.println(file.getAbsolutePath() + " has been copied to " + dir.getAbsolutePath());
            } else {
                System.out.println("File does not exist!");
            }
        } catch (IOException ex) {
            System.out.println("An error occured while copying the file!");
            ex.printStackTrace();
        } finally {
            try {
                if (source != null) {
                    source.close();
                }
                if (destination != null) {
                    destination.close();
                }
            } catch (IOException ex) {
                System.out.println("An error occured while closing the file streams!");
                ex.printStackTrace();
            }
        }
    }
}

删除一个非空目录“D:\\java”的Java程序实现代码：

import java.io.File;

public class DeleteDirectoryExample {
    public static void main(String[] args) {
        File directory = new File("D:\\java");

        if (directory.exists()) {
            deleteDirectory(directory);
            System.out.println(directory.getAbsolutePath() + " has been deleted.");
        } else {
            System.out.println("Directory does not exist!");
        }
    }

    private static void deleteDirectory(File directory) {
        if (directory.isDirectory()) {
            File[] files = directory.listFiles();

            if (files != null) {
                for (File file : files) {
                    deleteDirectory(file);
                }
            }
        }

        if (directory.delete()) {
            System.out.println(directory.getAbsolutePath() + " has been deleted.");
        }
    }
}

希望能帮助到您，如果您还有其他问题，请随时向我提问。