DoubleBuffer put()方法在 Java 中的示例| Set 1
原文:https://www . geesforgeks . org/double buffer-put-methods-in-Java-with-examples-set-1/
放(双 f)
java.nio.DoubleBuffer 类的 put(double f) 方法用于将给定的 double 写入当前位置新创建的 DoubleBuffer 中，然后递增该位置。
语法:
public abstract DoubleBuffer put(double f)
参数:该方法将双值 f 作为参数写入双缓冲区。
返回值:此方法返回此缓冲区，其中插入了双精度值。
异常:该方法抛出以下异常:
- 缓冲区溢出异常–如果该缓冲区的当前位置不小于其极限
- 只读缓冲区异常–如果该缓冲区是只读的
以下是举例说明放(双 f)法: 例 1:
// Java program to demonstrate
// put() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 3;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer using put() method
db.put(8.56D);
db.put(9.61D);
db.put(7.86D);
db.rewind();
// print the DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(db.array()));
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
Output:
Original DoubleBuffer: [8.56, 9.61, 7.86]
示例 2: 演示 BufferOverflowException。
// Java program to demonstrate
// put() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 3;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer using put() method
db.put(8.56F);
db.put(9.61F);
db.put(7.86F);
System.out.println("Trying to put the Double at the "
+ "position more than its limit");
db.put(7.86F);
// rewind the Doublebuffer
db.rewind();
// print the DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(db.array()));
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
Output:
Trying to put the Double at the position more than its limit
Exception throws : java.nio.BufferOverflowException
示例 3: 演示 ReadOnlyBufferException。
// Java program to demonstrate
// put() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of theDoubleBuffer
int capacity = 3;
// Creating theDoubleBuffer
try {
// creating object ofDoublebuffer
// and allocating size capacity using allocate() method
DoubleBuffer db = DoubleBuffer.allocate(capacity);
// Creating a read-only copy ofDoubleBuffer
// using asReadOnlyBuffer() method
DoubleBuffer db1 = db.asReadOnlyBuffer();
System.out.println("Trying to put theDouble value"
+ " in read only buffer");
// putting the value in readonlyDoublebuffer
// using put() method
db1.put(8.56F);
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
Output:
Trying to put theDouble value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException
put(int index，double f)
java.nio.DoubleBuffer 类的 put(int index，double f) 方法用于将给定的 double 写入给定索引处的缓冲区。
语法:
public abstract DoubleBuffer put(int index, double f)
参数:该方法采用以下参数作为参数:
- 索引:将写入双精度的索引
- f :要写入的双精度值
返回值:这个方法返回这个缓冲区。
异常:此方法引发以下异常:
- indexout of boundsexception–如果索引为负或不小于缓冲区的限制
- 只读缓冲区异常–如果该缓冲区是只读的
下面是举例说明 put(int index，double f)方法的例子:
例 1:
// Java program to demonstrate
// put() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 3;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer using put() at index 0
db.put(0, 8.56F);
// putting the value in Doublebuffer using put() at index 2
db.put(2, 9.61F);
// putting the value in Doublebuffer using put() at index 1
db.put(1, 7.86F);
// rewinding the Doublebuffer
db.rewind();
// print the DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(db.array()));
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
Output:
Original DoubleBuffer: [8.5600004196167, 7.860000133514404, 9.609999656677246]
示例 2: 演示 IndexOutOfBoundsException。
// Java program to demonstrate
// put() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 3;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
// using put() at index 0
db.put(0, 8.56F);
// putting the value in Doublebuffer
// using put() at index 2
db.put(2, 9.61F);
// putting the value in Doublebuffer
// using put() at index -1
System.out.println("Trying to put the value"
+ " at the negative index");
db.put(-1, 7.86F);
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
Output:
Trying to put the value at the negative index
Exception throws : java.lang.IndexOutOfBoundsException
示例 3: 演示 ReadOnlyBufferException。
// Java program to demonstrate
// put() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 3;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity using allocate() method
DoubleBuffer db = DoubleBuffer.allocate(capacity);
// Creating a read-only copy of DoubleBuffer
// using asReadOnlyBuffer() method
DoubleBuffer db1 = db.asReadOnlyBuffer();
System.out.println("Trying to put the Double value"
+ " in read only buffer");
// putting the value in readonly Doublebuffer
// using put() method
db1.put(0, 8.56F);
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
Output:
Trying to put the Double value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException
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