极客教程Java CharBuffer put()方法
put(char i)
java.nio.CharBuffer 类的 put(char i) 方法用于将给定的字符写入新创建的char缓冲区的当前位置，然后递增该位置。
语法:
public abstract CharBuffer put(char i)
参数： 该方法以char值 i 为参数，该值将被写入char缓冲区。
返回值： 该方法返回这个缓冲区，其中插入了char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(char i)方法的例子。
例1 :
// Java program to demonstrate
// put(char i) method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(capacity);
// putting the value in Charbuffer using put() method
cb.put('a');
cb.put('b');
cb.put('c');
cb.rewind();
// print the CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb.array()));
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出
Original CharBuffer: [a, b, c]
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 CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(capacity);
// putting the value in Charbuffer using put() method
cb.put('a');
cb.put('b');
cb.put('c');
System.out.println("Trying to put the Int at the "
+ "position more than its limit");
cb.put('d');
// rewind the Charbuffer
cb.rewind();
// print the CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb.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 Int 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 CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity using allocate() method
CharBuffer cb = CharBuffer.allocate(capacity);
// Creating a read-only copy of CharBuffer
// using asReadOnlyBuffer() method
CharBuffer cb1 = cb.asReadOnlyBuffer();
System.out.println("Trying to put the Int value"
+ " in read only buffer");
// putting the value in readonly Charbuffer
// using put() method
cb1.put('a');
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出
Trying to put the Int value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException
put(int index, char i)
java.nio.CharBuffer类的put(int index, char i)方法是用来将给定的int写入给定索引的缓冲区中。
语法
public abstract CharBuffer put(int index, char i)
参数： 该方法接受以下参数作为参数。
- index : 将被写入的字符的索引
- i : 要写入的字符值
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- 如果索引为负数或不小于缓冲区的极限值
- ReadOnlyBufferException- 如果这个缓冲区是只读的。
下面是说明put(int index, char i)方法的例子。
例1 :
// Java program to demonstrate
// put(int index,char i) method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(capacity);
// putting the value in Charbuffer using put() at index 0
cb.put(0, 'a');
// putting the value in Charbuffer using put() at index 2
cb.put(2, 'c');
// putting the value in Charbuffer using put() at index 1
cb.put(1, 'b');
// rewinding the Charbuffer
cb.rewind();
// print the CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb.array()));
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出
Original CharBuffer: [a, b, c]
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 CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(capacity);
// putting the value in Charbuffer
// using put() at index 0
cb.put(0, 'c');
// putting the value in Charbuffer
// using put() at index 2
cb.put(2, 'b');
// putting the value in Charbuffer
// using put() at index -1
System.out.println("Trying to put the value"
+ " at the negative index");
cb.put(-1, 'a');
}
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 CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity using allocate() method
CharBuffer cb = CharBuffer.allocate(capacity);
// Creating a read-only copy of CharBuffer
// using asReadOnlyBuffer() method
CharBuffer cb1 = cb.asReadOnlyBuffer();
System.out.println("Trying to put the Int value"
+ " in read only buffer");
// putting the value in readonly Charbuffer
// using put() method
cb1.put(0, 'a');
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出
Trying to put the Int value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException