Java 中的 DoubleBuffer 重复()方法，示例
原文:https://www . geesforgeks . org/double buffer-用示例复制 java 中的方法/
java.nio.DoubleBuffer 类的replicate()方法用于创建共享给定缓冲区内容的新浮动缓冲区。
新缓冲区的内容将是该缓冲区的内容。对此缓冲区内容的更改将在新缓冲区中可见，反之亦然；两个缓冲器的位置、极限和标记值将是独立的。
新缓冲区的容量、限制、位置和标记值将与该缓冲区相同。如果且仅当该缓冲区是直接的，则新缓冲区将是直接的；如果且仅当该缓冲区是只读的，则新缓冲区将是只读的。
语法:
public abstract DoubleBuffer duplicate()
返回值:这个方法返回新的双缓冲区，它携带了之前的双缓冲区内容
下面是说明 duplicate()方法的示例:
程序 1:
// Java program to demonstrate
// duplicate() method
// Using direct Doublebuffer
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 10;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db1 = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
db1.put(8.56F);
db1.put(2, 9.61F);
db1.rewind();
// print the Original DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(db1.array()));
// Creating a duplicate copy of DoubleBuffer
// using duplicate() method
DoubleBuffer db2 = db1.duplicate();
// print the duplicate copy of DoubleBuffer
System.out.print("\nDuplicate DoubleBuffer: "
+ Arrays.toString(db2.array()));
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original DoubleBuffer: [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Duplicate DoubleBuffer: [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
例 2:
// Java program to demonstrate
// duplicate() method
// using read-onlyDoublebuffer
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 10;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db1 = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
db1.put(8.56F);
db1.put(2, 9.61F);
db1.rewind();
// print the Original DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(db1.array()));
// Creating a read-only copy of DoubleBuffer
// using asReadOnlyBuffer() method
DoubleBuffer readonly = db1.asReadOnlyBuffer();
// print the read-only copy of DoubleBuffer
System.out.print("\nread-only DoubleBuffer: ");
while (readonly.hasRemaining())
System.out.print(readonly.get() + ", ");
System.out.println("");
// Rewinding the readonly DoubleBuffer
readonly.rewind();
// Creating a duplicate copy of DoubleBuffer
// using duplicate() method
DoubleBuffer db2 = readonly.duplicate();
// print the duplicate copy of DoubleBuffer
System.out.print("\nduplicate copy of read-only DoubleBuffer: ");
while (db2.hasRemaining())
System.out.print(db2.get() + ", ");
System.out.println("");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original DoubleBuffer: [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
read-only DoubleBuffer: 8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
duplicate copy of read-only DoubleBuffer: 8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
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