Java中的ConcurrentSkipListSet contains()方法

这个 包含() 方法 JAVAutil。同时发生的ConcurrentSkipListSet 是Java中的内置函数,如果指定元素存在于该集合中,则返回true boolean值,否则返回false。

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语法:

ConcurrentSkipListSet.contains(Object o)

参数: 该函数只接受一个参数 o i、 e.检查该装置中是否存在。

返回值: 该函数返回一个布尔值。如果此集合中存在指定的元素,则返回True,否则返回False。

下面的程序演示了ConcurrentSkipListSet。contains()方法:

项目1:

// Java Program Demonstrate contains()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetContainsExample1 {
public static void main(String[] args)
{
// Initializing the set
ConcurrentSkipListSet<Integer>
set = new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
for ( int i = 10 ; i <= 15 ; i++)
set.add(i);
// Checks if 9 is present in the set
if (set.contains( 9 ))
System.out.println( "9 is present in the set." );
else
System.out.println( "9 is not present in the set." );
}
}


输出:

9 is not present in the set.

项目2:

// Java Program Demonstrate contains()
// method of ConcurrentSkipListSet */
import java.util.concurrent.*;
class ConcurrentSkipListSetContainsExample2 {
public static void main(String[] args)
{
// Initializing the set
ConcurrentSkipListSet<String>
set = new ConcurrentSkipListSet<String>();
// Adding elements to this set
set.add( "Gfg" );
set.add( "is" );
set.add( "fun" );
// Checks if Gfg is present in the set
if (set.contains( "Gfg" ))
System.out.println( "Gfg is present in the set." );
else
System.out.println( "Gfg is not present in the set." );
}
}


输出:

Gfg is present in the set.

参考 : https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#contains-爪哇。lang.反对-

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