update:demo5

com/study/demo5/FileCopy.java

@@ -0,0 +1,20 @@
+package com.study.demo5;
+
+import java.io.*;
+
+public class FileCopy {
+  public void copy(String source, String target) {
+    try (FileInputStream fis = new FileInputStream(source);
+        FileOutputStream fos = new FileOutputStream(target)) {
+      byte[] buffer = new byte[1024];
+      int bytesRead;
+      while ((bytesRead = fis.read(buffer)) != -1) {
+        fos.write(buffer, 0, bytesRead);
+      }
+    } catch (FileNotFoundException e) {
+      System.err.println("源文件未找到: " + e.getMessage());
+    } catch (IOException e) {
+      System.err.println("文件复制失败: " + e.getMessage());
+    }
+  }
+}