ByteBuffer compact() 方法在 Java 中
緩衝區可以透過 java.nio.ByteBuffer 類中的 compact() 方法壓縮。此方法無需引數,並使用相同內容返回新的壓縮 ByteBuffer,並且如果是隻讀緩衝區,則會引發 ReadOnlyBufferException。
對此進行說明的程式如下 −
示例
import java.nio.*;
import java.util.*;
public class Demo {
public static void main(String[] args) {
int n = 5;
try {
ByteBuffer buffer = ByteBuffer.allocate(n);
buffer.put((byte)5);
buffer.put((byte)8);
buffer.put((byte)3);
System.out.println("The Original ByteBuffer is: " + Arrays.toString(buffer.array()));
System.out.println("The position is: " + buffer.position());
System.out.println("The limit is: " + buffer.limit());
ByteBuffer bufferCompact = buffer.compact();
System.out.println("
The Compacted ByteBuffer is: " + Arrays.toString(bufferCompact.array()));
System.out.println("The position is: " + bufferCompact.position());
System.out.println("The limit is: " + bufferCompact.limit());
} catch (IllegalArgumentException e) {
System.out.println("Error!!! IllegalArgumentException");
} catch (ReadOnlyBufferException e) {
System.out.println("Error!!! ReadOnlyBufferException");
}
}
}輸出
The Original ByteBuffer is: [5, 8, 3, 0, 0] The position is: 3 The limit is: 5 The Compacted ByteBuffer is: [0, 0, 3, 0, 0] The position is: 2 The limit is: 5
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