Java中的 CopyOnWriteArraySet remove() 方法
CopyOnWriteArraySet的remove()方法会移除指定元素(如果它存在于集合中)。
句法:
public boolean remove(Object o)
参数:该函数接受一个强制参数o ,它指定要从集合中删除的元素(如果存在)。
返回值:如果 set 包含指定的元素,则该函数返回true 。
下面的程序说明了上述函数:
方案一:
// Java Program to illustrate the
// remove() method in Java
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArraySet
CopyOnWriteArraySet ArrSet
= new CopyOnWriteArraySet();
// Add elements
ArrSet.add(32);
ArrSet.add(67);
ArrSet.add(98);
ArrSet.add(100);
// print CopyOnWriteArraySet
System.out.println("CopyOnWriteArraySet: "
+ ArrSet);
// Remove using remove() function
if (ArrSet.remove(100))
System.out.println("Set after removal"
+ " of 100 is: "
+ ArrSet);
else
System.out.println("100 is not present");
}
}
输出:
CopyOnWriteArraySet: [32, 67, 98, 100]
Set after removal of 100 is: [32, 67, 98]
方案二:
// Java Program to illustrate the
// isEmpty() method in Java
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArraySet
CopyOnWriteArraySet ArrSet
= new CopyOnWriteArraySet();
// Add elements
ArrSet.add("gopal");
ArrSet.add("geeks");
ArrSet.add("geeks");
ArrSet.add("technical");
// print CopyOnWriteArraySet
System.out.println("CopyOnWriteArraySet: "
+ ArrSet);
// Remove using remove() function
if (ArrSet.remove("scripter"))
System.out.println("Set after removal"
+ " of 'scripter' is: "
+ ArrSet);
else
System.out.println("'scripter' is not present");
}
}
输出:
CopyOnWriteArraySet: [gopal, geeks, technical]
'scripter' is not present
参考: https: Java/util/concurrent/CopyOnWriteArraySet.html#remove-java.lang.Object-