布尔类|番石榴|爪哇

布尔值 是用于基本类型Boolean的实用程序类。它提供 静态效用方法 用于修饰或说明布尔基元,在布尔基元或数组中都找不到。

null

宣言:

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

下面是Guava Booleans类提供的一些方法: 图片[1]-布尔类|番石榴|爪哇-yiteyi-C++库 例外情况:

  • 保证能力: 非法数据异常 如果minLength或padding为负数。
  • 今天: 空指针异常 如果集合或其任何元素为空。

下表显示了Guava Booleans类提供的一些其他方法: 图片[2]-布尔类|番石榴|爪哇-yiteyi-C++库 下面给出了一些示例,展示了Guava Booleans类方法的实现: 例1:

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


输出:

[true, false, true, false, true]

例2:

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


输出:

[true, false, true, false, true]

例3:

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


输出:

[true, false, true, false, true]

例4:

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


输出:

true
true

例5:

// Java code to show implementation
// of Guava Booleans.compare() method
import com.google.common.primitives.Booleans;
class GFG {
// Driver method
public static void main(String[] args)
{
// To compare true vs true
System.out.println(Booleans.compare( true , true ));
}
}


输出:

0

例6:

// Java code to show implementation
// of Guava Booleans.indexOf() method
import com.google.common.primitives.Booleans;
class GFG {
// Driver method
public static void main(String[] args)
{
boolean [] arr = { true , false , true , false , true };
// To print index of first occurence of false
System.out.println(Booleans.indexOf(arr, false ));
}
}


输出:

1
© 版权声明
THE END
喜欢就支持一下吧
点赞8 分享