linkedhashset

LinkedHashSet类contains()方法 (LinkedHashSet Class contains() method)

• contains() method is available in java.util package.

  contains()方法在java.util包中可用。

• contains() method is used to check whether the given object (ob) exists or not exists in this LinkedHashSet.

  contains()方法用于检查给定对象(ob)在此LinkedHashSet中是否存在。

• contains() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  contains()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• contains() method does not throw an exception at the time of checking elements.

  contains()方法在检查元素时不会引发异常。

Syntax:

句法：

    public boolean contains(Object ob);

Parameter(s):

参数：

• Object ob – represents the object to be tested for its existence in this LinkedHashSet.

  对象ob –表示要测试的对象在此LinkedHashSet中是否存在。

Return value:

返回值：

The return type of the method is boolean, it returns true when the given object exists otherwise it returns false.

方法的返回类型为boolean ，当给定对象存在时返回true ，否则返回false 。

Example:

例：

// Java program to demonstrate the example 
// of boolean contains(Object ob)  method of  
// LinkedHashSet 
import java.util.*;
public class ContainsOfLinkedHashSet {
public static void main(String[] args) {
// Instantiates a LinkedHashSet object
HashSet < String > hs = new LinkedHashSet < String > ();
// By using add() method is to add
// the given object of this
// LinkedHashSet 
hs.add("C");
hs.add("C++");
hs.add("JAVA");
hs.add("PHP");
hs.add("SFDC");
// Display LinkedHashSet
System.out.println("LinkedHashSet: " + hs);
// By using contains() method is to 
// check whether the given object exists
// or not exists in this LinkedHashSet
boolean status = hs.contains("JAVA");
// Display Status
System.out.println("hs.contains(JAVA): " + status);
}
}

Output

输出量

LinkedHashSet: [C, C++, JAVA, PHP, SFDC]
hs.contains(JAVA): true

翻译自: https://www.includehelp.com/java/linkedhashset-contains-method-with-example.aspx

linkedhashset