Java 中的 LongBuffer get()方法
原文:https://www . geesforgeks . org/longbuffer-get-methods-in-Java/
get()
类的 get() 方法用于读取给定缓冲区当前位置的龙，然后增加位置。
语法:
public abstract Long get()
返回值:该方法返回缓冲区当前位置的 Long 值。
抛出:此方法抛出bufferenderflow exception–如果缓冲区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:
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 LongBuffer
int capacity = 5;
// Creating the LongBuffer
try {
// creating object of Longbuffer
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity);
// putting the value in Longbuffer
ib.put(8);
ib.put(9);
ib.put(1);
ib.rewind();
// prLong the LongBuffer
System.out.println("Original LongBuffer: "
+ Arrays.toString(ib.array()));
// Reads the Long at this buffer's current position
// using get() method
Long value = ib.get();
// prLong the Long value
System.out.println("Long Value: " + value);
// Reads the Long at this buffer's next position
// using get() method
Long value1 = ib.get();
// prLong the Long value
System.out.print("Next Long 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);
}
}
}
Output:
Original LongBuffer: [8, 9, 1, 0, 0]
Long Value: 8
Next Long Value: 9
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 LongBuffer
int capacity = 3;
// Creating the LongBuffer
try {
// creating object of Longbuffer
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity);
// putting the value in Longbuffer
ib.put(8);
ib.put(9);
// prLong the LongBuffer
System.out.println("Original LongBuffer: "
+ Arrays.toString(ib.array()));
// Reads the Long at this buffer's current position
// using get() method
Long value = ib.get();
// prLong the Long value
System.out.println("Long Value: " + value);
// Reads the Long at this buffer's next position
// using get() method
System.out.print("Since the buffer current position is incremented");
System.out.print(" to greater than its limit ");
Long value1 = ib.get();
// prLong the Long value
System.out.print("Next Long 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);
}
}
}
Output:
Original LongBuffer: [8, 9, 0]
Long Value: 0
Since the buffer current position is incremented to greater than its limit Exception throws : java.nio.BufferUnderflowException
get(长索引)
LongBuffer 的 get(Long index) 方法用于读取指定索引处的文章。
语法:
public abstract Long get(Long index)
参数:该方法以指标(读取龙的指标)为参数。
返回值:该方法返回给定索引处的 Long 值。
异常:此方法抛出indexout of boundsexception。如果索引为负或不小于缓冲区的限制，则会引发此异常。
以下是说明 get(长索引)方法的示例:
例 1:
// Java program to demonstrate
// get(Long index) method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the LongBuffer
int capacity = 3;
// Creating the LongBuffer
try {
// creating object of Longbuffer
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity);
// putting the value in Longbuffer
ib.put(8);
ib.put(9);
ib.put(6);
// prLong the LongBuffer
System.out.println("Original LongBuffer: "
+ Arrays.toString(ib.array()));
// Reads the Long at the index 0 of the Longbuffer
// using get() method
Long value0 = ib.get(0);
// prLong the Long value
System.out.println("Long Value at index 0: " + value0);
// Reads the Long at the index 1 of the Longbuffer
// using get() method
Long value1 = ib.get(1);
// prLong the Long value
System.out.println("Long Value at index 1: " + value1);
// Reads the Long at the index 2 of the Longbuffer
// using get() method
Long value2 = ib.get(2);
// prLong the Long value
System.out.println("Long 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);
}
}
}
Output:
Original LongBuffer: [8, 9, 6]
Long Value at index 0: 8
Long Value at index 1: 9
Long Value at index 2: 6
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 LongBuffer
int capacity = 3;
// Creating the LongBuffer
try {
// creating object of Longbuffer
// and allocating size capacity
LongBuffer ib = LongBuffer.allocate(capacity);
// putting the value in Longbuffer
ib.put(6);
ib.put(8);
ib.put(12);
// prLong the LongBuffer
System.out.println("Original LongBuffer: "
+ Arrays.toString(ib.array()));
// Reads the Long at the index 0 of the Longbuffer
// using get() method
Long value0 = ib.get(0);
// prLong the Long value
System.out.println("Long Value at index 0: " + value0);
// Reads the Long at the index 1 of the Longbuffer
// using get() method
Long value1 = ib.get(1);
// prLong the Long value
System.out.println("Long Value at index 1: " + value1);
// Reads the Long at the index 2 of the Longbuffer
// using get() method
System.out.println("Trying to get the Long"
+ " of index greater than its limit ");
Long value2 = ib.get(4);
// prLong the Long value
System.out.println("Long 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);
}
}
}
Output:
Original LongBuffer: [6, 8, 12]
Long Value at index 0: 6
Long Value at index 1: 8
Trying to get the Long of index greater than its limit
Exception thrown: java.lang.IndexOutOfBoundsException
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