极客教程Java FloatBuffer put()方法及例子
put(float f)
java.nio.FloatBuffer 类的 put(float f) 方法用于将给定的浮点数写入新创建的浮点数缓冲区的当前位置，然后递增该位置。
语法:
public abstract FloatBuffer put(float f)
参数： 该方法以Float值f作为参数，将其写入Float缓冲区。
返回值： 该方法返回这个缓冲区，在这个缓冲区中插入了浮点值。
异常： 该方法会抛出以下异常。
- BufferOverflowException- 如果这个缓冲区的当前位置不小于它的极限值。
- ReadOnlyBufferException- 如果这个缓冲区是只读的。
下面是说明put(float 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 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]
例2： 为了证明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
实例3： 为了证明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
put(int index, float f)
java.nio.FloatBuffer类的put(int index, float f)方法是用来将给定的浮点数写入给定索引的缓冲区中。
语法
public abstract FloatBuffer put(int index, float f)
参数： 该方法需要以下参数作为参数。
- index : 将被写入浮点数的索引
- f : 将要写入的Float值
返回值 ：该方法返回这个缓冲区。
异常： 该方法会抛出以下异常。
- IndexOutOfBoundsException- 如果索引是负数或者不小于缓冲区的极限值。
- ReadOnlyBufferException- 如果这个缓冲区是只读的。
下面是一些例子来说明put(int index, float f)方法。
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 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]
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
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