Guava Chars类

Guava Chars类

Chars 是原始类型char的一个实用类。它提供了与char基元有关的静态实用方法,这些方法在Character或Arrays中都没有找到。这个类中的所有操作都是严格按照数字处理的,也就是说,它们既不认识Unicode,也不依赖本地。

Guava Chars类声明 :

@GwtCompatible(emulated=true)
public final class Chars
extends Object

下表显示了Guava Chars类的字段摘要 :

Guava Chars类

Guava Chars类提供的一些方法是 。

Guava Chars类
异常 :

  • checkedCast : 如果值大于Character.MAX_VALUE或小于Character.MIN_VALUE
  • min : 如果数组是空的,IllegalArgumentException。
  • max : 如果数组为空,则出现IllegalArgumentException。
  • fromByteArray : 如果字节的元素少于2个,则出现IllegalArgumentException。
  • ensureCapacity : 如果minLength或padding为负数,则出现IllegalArgumentException。
  • toArray : 如果集合或其任何元素为空,则出现NullPointerException。

下表显示了Guava Chars类提供的其他一些方法:
Guava Chars类
下面给出了一些例子,显示了Guava Chars类方法的实现:
例子1:

// Java code to show implementation
// of Guava Chars.asList() method
  
import com.google.common.primitives.Chars;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        char arr[] = { 'g', 'e', 'e', 'k', 's' };
  
        // Using Chars.asList() method which
        // converts array of primitives
        // to array of objects
        List<Character> myList = Chars.asList(arr);
  
        // Displaying the elements
        System.out.println(myList);
    }
}

输出:

[g, e, e, k, s]

例子2:

// Java code to show implementation
// of Guava Chars.toArray() method
  
import com.google.common.primitives.Chars;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        List<Character> myList = Arrays.asList('g', 'e', 'e', 'k', 's');
  
        // Using Chars.toArray() method which
        // converts a List of Chars to an
        // array of char
        char[] arr = Chars.toArray(myList);
  
        // Displaying the elements
        System.out.println(Arrays.toString(arr));
    }
}

输出:

[g, e, e, k, s]

例子3:

// Java code to show implementation
// of Guava Chars.concat() method
  
import com.google.common.primitives.Chars;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        char[] arr1 = { 'g', 'e', 'e' };
        char[] arr2 = { 'k', 's' };
  
        // Using Chars.concat() method which
        // combines arrays from specified
        // arrays into a single array
        char[] arr = Chars.concat(arr1, arr2);
  
        // Displaying the elements
        System.out.println(Arrays.toString(arr));
    }
}

输出:

[g, e, e, k, s]

例子4:

// Java code to show implementation
// of Guava Chars.contains() method
  
import com.google.common.primitives.Chars;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        char[] arr = { 'g', 'e', 'e', 'k', 's' };
  
        // Using Chars.contains() method which
        // checks if element is present in array
        // or not
        System.out.println(Chars.contains(arr, 'g'));
        System.out.println(Chars.contains(arr, 'm'));
    }
}

输出:

true
false

例子5:

// Java code to show implementation
// of Guava Chars.min() method
  
import com.google.common.primitives.Chars;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        char[] arr = { 'g', 'e', 'e', 'k', 's' };
  
        // Using Chars.min() method
        System.out.println(Chars.min(arr));
    }
}

输出:

e

例子6:

// Java code to show implementation
// of Guava Chars.max() method
  
import com.google.common.primitives.Chars;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        char[] arr = { 'g', 'e', 'e', 'k', 's' };
  
        // Using Chars.max() method
        System.out.println(Chars.max(arr));
    }
}

输出:

s

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