Java中的 FloatBuffer put() 方法及示例
放（浮点数）
Java.nio.FloatBuffer类的put(float f)方法用于将给定的float写入当前位置新创建的float buffer中，然后增加位置。
句法 ：
public abstract FloatBuffer put(float f)参数：此方法将浮点值f作为参数写入浮点缓冲区。
返回值：此方法返回此缓冲区，其中插入了浮点值。
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(float 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 FloatBuffer
int capacity = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity);
// putting the value in floatbuffer using put() method
fb.put(8.56F);
fb.put(9.61F);
fb.put(7.86F);
fb.rewind();
// print the FloatBuffer
System.out.println("Original FloatBuffer: "
+ Arrays.toString(fb.array()));
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出：
Original FloatBuffer: [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 FloatBuffer
int capacity = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity);
// putting the value in floatbuffer using put() method
fb.put(8.56F);
fb.put(9.61F);
fb.put(7.86F);
System.out.println("Trying to put the float at the "
+ "position more than its limit");
fb.put(7.86F);
// rewind the floatbuffer
fb.rewind();
// print the FloatBuffer
System.out.println("Original FloatBuffer: "
+ Arrays.toString(fb.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 float 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 the FloatBuffer
int capacity = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity using allocate() method
FloatBuffer fb = FloatBuffer.allocate(capacity);
// Creating a read-only copy of FloatBuffer
// using asReadOnlyBuffer() method
FloatBuffer fb1 = fb.asReadOnlyBuffer();
System.out.println("Trying to put the float value"
+ " in read only buffer");
// putting the value in readonly floatbuffer
// using put() method
fb1.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 the float value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException
放（int 指数，浮动 f）
Java.nio.FloatBuffer 类的 put(int index, float f) 方法用于将给定的浮点数写入给定索引处的缓冲区。
句法：
public abstract FloatBuffer put(int index, float f)参数：此方法采用以下参数作为参数：
- index ：将写入浮点数的索引
- f : 要写入的浮点值
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, float 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 FloatBuffer
int capacity = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity);
// putting the value in floatbuffer using put() at index 0
fb.put(0, 8.56F);
// putting the value in floatbuffer using put() at index 2
fb.put(2, 9.61F);
// putting the value in floatbuffer using put() at index 1
fb.put(1, 7.86F);
// rewinding the floatbuffer
fb.rewind();
// print the FloatBuffer
System.out.println("Original FloatBuffer: "
+ Arrays.toString(fb.array()));
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出：
Original FloatBuffer: [8.56, 7.86, 9.61]
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 FloatBuffer
int capacity = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity);
// putting the value in floatbuffer
// using put() at index 0
fb.put(0, 8.56F);
// putting the value in floatbuffer
// using put() at index 2
fb.put(2, 9.61F);
// putting the value in floatbuffer
// using put() at index -1
System.out.println("Trying to put the value"
+ " at the negative index");
fb.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 FloatBuffer
int capacity = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity using allocate() method
FloatBuffer fb = FloatBuffer.allocate(capacity);
// Creating a read-only copy of FloatBuffer
// using asReadOnlyBuffer() method
FloatBuffer fb1 = fb.asReadOnlyBuffer();
System.out.println("Trying to put the float value"
+ " in read only buffer");
// putting the value in readonly floatbuffer
// using put() method
fb1.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 float value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException