Guava Booleans 类

Guava Primitive 实用程序

Booleans 是原始类型 Boolean 的实用程序类。

类声明

以下是 com.google.common.primitives.Booleans 类的声明

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

类方法

方法继承

该类继承了以下类的方法 -

• java.lang.Object

Booleans 类示例

在 C:/> Guava 中使用我们选择的任何编辑器创建以下 java 程序。

GuavaTester.java

import java.util.List;
import com.google.common.primitives.Booleans;

public class GuavaTester {
   public static void main(String args[]) {
      GuavaTester tester = new GuavaTester();
      tester.testBooleans();
   }

   private void testBooleans() {
      boolean[] booleanArray = {true,true,false,true,true,false,false};

      List<Boolean> objectArray = Booleans.asList(booleanArray);
      System.out.println(objectArray.toString());

      booleanArray = Booleans.toArray(objectArray);
      System.out.print("[ ");

      for(int i = 0; i< booleanArray.length ; i++) {
         System.out.print(booleanArray[i] + " ");
      }

      System.out.println("]");

      System.out.println("true is in list? " + Booleans.contains(booleanArray, true));

      System.out.println("true position in list " + Booleans.indexOf(booleanArray, true));

      System.out.println("true occured: " + Booleans.countTrue());

      System.out.println("false Vs true: " + Booleans.compare(false, true));
      System.out.println("false Vs false: " + Booleans.compare(false, false));
      System.out.println("true Vs false: " + Booleans.compare(true, false));
      System.out.println("true Vs true: " + Booleans.compare(true, true));
   }
}

验证结果

使用 javac 编译器编译类，如下所示

C:\Guava>javac GuavaTester.java

现在运行 GuavaTester 以查看结果。

C:\Guava>java GuavaTester

结果如下

[true, true, false, true, true, false, false]
[ true true false true true false false ]
true is in list? true
true position in list 0
true occured: 0
false Vs true: -1
false Vs false: 0
true Vs false: 1
true Vs true: 0

Guava Primitive 实用程序