guava booleans 类——迹忆客-ag捕鱼王app官网

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 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