字节类|番石榴| Java
字节是一个用于原语类型字节的实用程序类。它提供了与字节基元相关的 静态实用方法 ，这些基元在字节或数组中都找不到，并且将字节解释为既无符号也无符号。专门将字节视为有符号或无符号的方法可以在有符号字节和无符号字节中找到。
申报:
@GwtCompatible(emulated=true)
public final class Bytes
extends Object
下表显示了番石榴字节类提供的方法:
异常:
- 确保容量: 如果最小长度或填充值为负，则显示“异常”。
- to array:NullPointerException如果集合或其任何元素为空。
下面给出了一些显示番石榴字节类方法实现的示例: 示例 1 :
// Java code to show implementation
// of Guava Bytes.asList() method
import com.google.common.primitives.Bytes;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
byte arr[] = { 3, 4, 5, 6, 7 };
// Using Bytes.asList() method which convert
// array of primitives to array of objects
List<Byte> myList = Bytes.asList(arr);
// Displaying the elements
System.out.println(myList);
}
}
输出:
[3, 4, 5, 6, 7]
例 2 :
// Java code to show implementation
// of Guava Bytes.indexOf() method
import com.google.common.primitives.Bytes;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
byte[] arr = { 3, 4, 5, 6, 7 };
// Displaying the index for
// first occurrence of given target
System.out.println(Bytes.indexOf(arr, (byte)5));
}
}
输出:
2
例 3 :
// Java code to show implementation
// of Guava Bytes.concat() method
import com.google.common.primitives.Bytes;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
byte[] arr1 = { 3, 4, 5 };
byte[] arr2 = { 6, 7 };
// Using Bytes.concat() method which
// combines arrays from specified
// arrays into a single array
byte[] arr = Bytes.concat(arr1, arr2);
// Displaying the elements
System.out.println(Arrays.toString(arr));
}
}
输出:
[3, 4, 5, 6, 7]
例 4 :
// Java code to show implementation
// of Guava Bytes.contains() method
import com.google.common.primitives.Bytes;
class GFG {
// Driver method
public static void main(String[] args)
{
byte[] arr = { 3, 4, 5, 6, 7 };
// Using Bytes.contains() method which
// checks if element is present in array
// or not
System.out.println(Bytes.contains(arr, (byte)8));
System.out.println(Bytes.contains(arr, (byte)7));
}
}
输出:
false
true
例 5 :
// Java code to show implementation
// of Guava Bytes.lastIndexOf() method
import com.google.common.primitives.Bytes;
class GFG {
// Driver method
public static void main(String[] args)
{
byte[] arr = { 3, 4, 5, 6, 7, 5, 5 };
// Using Bytes.lastIndexOf() method
// to get last occurrence of given target
System.out.println(Bytes.lastIndexOf(arr, (byte)5));
}
}
输出:
6
例 6 :
// Java code to show implementation
// of Guava Bytes.lastIndexOf() method
import com.google.common.primitives.Bytes;
class GFG {
// Driver method
public static void main(String[] args)
{
byte[] arr = { 3, 4, 5, 6, 7, 5, 5 };
// Using Bytes.lastIndexOf() method
// to get last occurrence of given target
// here target i.e, 9 is not present in
// array arr, so -1 will be returned
System.out.println(Bytes.lastIndexOf(arr, (byte)9));
}
}
输出:
-1
版权属于：月萌API www.moonapi.com，转载请注明出处
