Java中的DoubleBuffer put() 方法与示例|设置 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 double 缓冲区中，然后将位置递增。
句法：
public abstract DoubleBuffer put(double f)参数：该方法将双精度值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：此方法抛出以下异常：
- BufferOverflowException – 如果此缓冲区的当前位置不小于其限制
- ReadOnlyBufferException – 如果此缓冲区是只读的
以下是说明 put(double f) 方法的示例：
示例 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);
}
}
}
输出：
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);
}
}
}
输出：
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);
}
}
}
输出：
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 写入到给定索引的缓冲区中。
句法：
public abstract DoubleBuffer put(int index, double f)参数：此方法采用以下参数作为参数：
- index ：将写入双精度的索引
- f : 要写入的双精度值
返回值：此方法返回此缓冲区。
异常：此方法抛出以下异常：
- IndexOutOfBoundsException – 如果 index 为负数或不小于缓冲区的限制
- ReadOnlyBufferException – 如果此缓冲区是只读的
下面是说明 put(int index, double f) 方法的示例：
示例 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);
}
}
}
输出：
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);
}
}
}
输出：
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);
}
}
}
输出：
Trying to put the Double value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException