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