guava range 类——迹忆客-ag捕鱼王app官网

range 表示一个区间或一个序列。 它用于获取位于特定范围内的一组数字/字符串。

类声明

以下是 com.google.common.collect.range 类的声明

@gwtcompatible
public final class range
   extends object
      implements predicate, serializable

类方法

方法继承

该类继承了以下类的方法 -

• java.lang.object

range 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 com.google.common.collect.contiguousset;
import com.google.common.collect.discretedomain;
import com.google.common.collect.range;
import com.google.common.primitives.ints;
public class guavatester {
   public static void main(string args[]) {
      guavatester tester = new guavatester();
      tester.testrange();
   }
   private void testrange() {
      //create a range [a,b] = { x | a <= x <= b}
      range range1 = range.closed(0, 9);    
      system.out.print("[0,9] : ");
      printrange(range1);        
      
      system.out.println("5 is present: "   range1.contains(5));
      system.out.println("(1,2,3) is present: "   range1.containsall(ints.aslist(1, 2, 3)));
      system.out.println("lower bound: "   range1.lowerendpoint());
      system.out.println("upper bound: "   range1.upperendpoint());
      //create a range (a,b) = { x | a < x < b}
      range range2 = range.open(0, 9);
      system.out.print("(0,9) : ");
      printrange(range2);
      //create a range (a,b] = { x | a < x <= b}
      range range3 = range.openclosed(0, 9);
      system.out.print("(0,9] : ");
      printrange(range3);
      //create a range [a,b) = { x | a <= x < b}
      range range4 = range.closedopen(0, 9);
      system.out.print("[0,9) : ");
      printrange(range4);
      //create an open ended range (9, infinity
      range range5 = range.greaterthan(9);
      system.out.println("(9,infinity) : ");
      system.out.println("lower bound: "   range5.lowerendpoint());
      system.out.println("upper bound present: "   range5.hasupperbound());
      range range6 = range.closed(3, 5);    
      printrange(range6);
      //check a subrange [3,5] in [0,9]
      system.out.println("[0,9] encloses [3,5]:"   range1.encloses(range6));
      range range7 = range.closed(9, 20);    
      printrange(range7);
      
      //check ranges to be connected        
      system.out.println("[0,9] is connected [9,20]:"   range1.isconnected(range7));
      range range8 = range.closed(5, 15);    
      //intersection
      printrange(range1.intersection(range8));
      //span
      printrange(range1.span(range8));
   }
   private void printrange(range range) {        
   
      system.out.print("[ ");
      
      for(int grade : contiguousset.create(range, discretedomain.integers())) {
         system.out.print(grade  " ");
      }
      system.out.println("]");
   }
}

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

[0,9] : [ 0 1 2 3 4 5 6 7 8 9 ]
5 is present: true
(1,2,3) is present: true
lower bound: 0
upper bound: 9
(0,9) : [ 1 2 3 4 5 6 7 8 ]
(0,9] : [ 1 2 3 4 5 6 7 8 9 ]
[0,9) : [ 0 1 2 3 4 5 6 7 8 ]
(9,infinity) : 
lower bound: 9
upper bound present: false
[ 3 4 5 ]
[0,9] encloses [3,5]:true
[ 9 10 11 12 13 14 15 16 17 18 19 20 ]
[0,9] is connected [9,20]:true
[ 5 6 7 8 9 ]
[ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ]