java.nio.CharBuffer类的get()方法用于读取给定缓冲区当前位置的char，然后递增该位置。
用法:
public abstract char get()
返回值：此方法返回缓冲区当前位置的char值。
异常：此方法抛出BufferUnderflowException-如果缓冲区的当前位置不小于其限制，则抛出此异常。
下面是说明get()方法的示例：
范例1：
// Java program to demonstrate
// get() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer
int capacity = 5;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(capacity);
// putting the value in Charbuffer
cb.put('a');
cb.put('b');
cb.put('c');
cb.rewind();
// print the CharBuffer
System.out.println("Original CharBuffer:"
+ Arrays.toString(cb.array()));
// Reads the Int at this buffer's current position
// using get() method
char value = cb.get();
// print the Int value
System.out.println("Int Value:" + value);
// Reads the Int at this buffer's next position
// using get() method
char value1 = cb.get();
// print the Int value
System.out.print("Next Int Value:" + value1);
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
catch (BufferUnderflowException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original CharBuffer:[a, b, c, , ] Int Value:a Next Int Value:b
范例2：
// Java program to demonstrate
// get() 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
cb.put('a');
cb.put('b');
// print the CharBuffer
System.out.println("Original CharBuffer:"
+ Arrays.toString(cb.array()));
// Reads the Char at this buffer's current position
// using get() method
char value = cb.get();
// print the Char value
System.out.println("Char Value:" + value);
// Reads the Char at this buffer's next position
// using get() method
System.out.print("Since the buffer current position is incremented\n");
System.out.print(" to greater than its limit ");
char value1 = cb.get();
// print the Char value
System.out.print("Next Char Value:" + value1);
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
catch (BufferUnderflowException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original CharBuffer:[a, b, ] Char Value: Since the buffer current position is incremented to greater than its limit Exception throws:java.nio.BufferUnderflowException
get(int index)
CharBuffer的get(int index)方法用于读取指定索引处的文章。
用法:
public abstract char get(int index)
参数：此方法将索引(将从中读取char的索引)作为参数。
返回值：此方法返回给定索引处的char值。
异常：此方法引发IndexOutOfBoundsException。如果index为负或不小于缓冲区的限制，则抛出此异常。
以下示例说明了get(int index)方法：
范例1：
// Java program to demonstrate
// get(int index) 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
cb.put('a');
cb.put('b');
cb.put('c');
// print the CharBuffer
System.out.println("Original CharBuffer:"
+ Arrays.toString(cb.array()));
// Reads the Char at the index 0 of the Charbuffer
// using get() method
char value0 = cb.get(0);
// print the Char value
System.out.println("Char Value at index 0:" + value0);
// Reads the Char at the index 1 of the Charbuffer
// using get() method
char value1 = cb.get(1);
// print the Char value
System.out.println("Char Value at index 1:" + value1);
// Reads the Char at the index 2 of the Charbuffer
// using get() method
char value2 = cb.get(2);
// print the Char value
System.out.println("Char Value at index 2:" + value2);
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (IndexOutOfBoundsException e) {
System.out.println("ReadOnlyBufferException catched");
}
catch (BufferUnderflowException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original CharBuffer:[a, b, c] Char Value at index 0:a Char Value at index 1:b Char Value at index 2:c
范例2：
// Java program to demonstrate
// get() 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
cb.put('a');
cb.put('b');
cb.put('c');
// print the CharBuffer
System.out.println("Original CharBuffer:"
+ Arrays.toString(cb.array()));
// Reads the Char at the index 0 of the Charbuffer
// using get() method
char value0 = cb.get(0);
// print the Char value
System.out.println("Char Value at index 0:" + value0);
// Reads the Char at the index 1 of the Charbuffer
// using get() method
char value1 = cb.get(1);
// print the Char value
System.out.println("Char Value at index 1:" + value1);
// Reads the Char at the index 2 of the Charbuffer
// using get() method
System.out.println("Trying to get the Char"
+ " of index greater than its limit ");
char value2 = cb.get(4);
// print the Char value
System.out.println("Char Value at index 2:" + value2);
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (IndexOutOfBoundsException e) {
System.out.println("Exception thrown:" + e);
}
catch (BufferUnderflowException e) {
System.out.println("Exception throws:" + e);
}
}
}
输出：
Original CharBuffer:[a, b, c] Char Value at index 0:a Char Value at index 1:b Trying to get the Char of index greater than its limit Exception thrown:java.lang.IndexOutOfBoundsException
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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 CharBuffer get() methods in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。