Initial commit

Homework0520/src/BufferFlipCompact.java

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+import java.nio.CharBuffer;
+
+public class BufferFlipCompact {
+    public static void main(String[] args) {
+        // 创建一个容量为8的CharBuffer
+        CharBuffer buffer = CharBuffer.allocate(8);
+        System.out.println("初始状态:");
+        printBufferStatus(buffer);
+        
+        // 写入字符串"Hello"
+        buffer.put("Hello");
+        System.out.println("\n写入'Hello'后:");
+        printBufferStatus(buffer);
+        
+        // 翻转缓冲区准备读取
+        buffer.flip();
+        System.out.println("\n翻转缓冲区后(flip):");
+        printBufferStatus(buffer);
+        
+        // 读取前3个字符('H', 'e', 'l')
+        System.out.println("\n读取前3个字符:");
+        for (int i = 0; i < 3; i++) {
+            char c = buffer.get();
+            System.out.print(c + " ");
+        }
+        System.out.println();
+        
+        System.out.println("\n读取3个字符后:");
+        printBufferStatus(buffer);
+        
+        // 压缩缓冲区
+        buffer.compact();
+        System.out.println("\n压缩缓冲区后(compact):");
+        printBufferStatus(buffer);
+        
+        // 再写入"World"
+        buffer.put("World");
+        System.out.println("\n写入'World'后:");
+        printBufferStatus(buffer);
+        
+        // 翻转并打印最终缓冲区内容
+        buffer.flip();
+        System.out.println("\n最终缓冲区内容:");
+        while (buffer.hasRemaining()) {
+            System.out.print(buffer.get());
+        }
+        System.out.println();
+        
+        // 显示完整的缓冲区内容（包括未读取的部分）
+        buffer.rewind(); // 回到开始位置
+        System.out.println("\n完整缓冲区内容:");
+        while (buffer.hasRemaining()) {
+            System.out.print(buffer.get());
+        }
+        System.out.println();
+    }
+    
+    // 打印缓冲区状态
+    private static void printBufferStatus(CharBuffer buffer) {
+        System.out.println("Position: " + buffer.position() + 
+                          ", Limit: " + buffer.limit() + 
+                          ", Capacity: " + buffer.capacity() +
+                          ", Remaining: " + buffer.remaining());
+    }
+}