java.nio.ByteBuffer類的hashCode()方法用於返回此緩衝區的當前哈希碼。
字節緩衝區的哈希碼僅取決於其剩餘元素;也就是說,從position()到(包括)limit()處的元素– 1。
因為緩衝區哈希碼是content-dependent,所以不建議將緩衝區用作哈希映射或類似數據結構中的鍵,除非已知緩衝區的內容不會改變。
用法:
public int hashCode()
返回值:此方法返回此緩衝區的當前哈希碼。
下麵是說明hashCode()方法的示例:
範例1:
// Java program to demonstrate
// getInt() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(12);
// putting the int value in the bytebuffer
bb.asIntBuffer()
.put(10)
.put(20)
.put(30);
// rewind the Bytebuffer
bb.rewind();
// print the ByteBuffer
System.out.println("Original ByteBuffer: ");
for (int i = 1; i <= 3; i++)
System.out.print(bb.getInt() + " ");
// rewind the Bytebuffer
bb.rewind();
// Reads the Int at this buffer's current position
// using getInt() method
int value = bb.hashCode();
// print the int value
System.out.println("\n\nByte Value: " + value);
}
}
輸出:
Original ByteBuffer: 10 20 30 Byte Value: -219122491
範例2:
// Java program to demonstrate
// getInt() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(12);
// Reads the Int at this buffer's current position
// using getInt() method
int value = bb.hashCode();
// print the int value
System.out.println("Byte Value: " + value);
}
}
輸出:
Byte Value: -293403007
參考: https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#hashCode–
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注:本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 ByteBuffer hashCode() method in Java with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。