Java中的 CopyOnWriteArrayList size() 方法
CopyOnWriteArrayList的size()方法返回列表的大小。它返回列表中元素的数量。
句法:
public int size()
参数:该函数不接受任何参数。
返回值:函数返回列表的大小。
下面的程序说明了上述函数:
方案一:
// Java Program to illustrate the CopyOnWriteArrayList
// size() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArrayList
CopyOnWriteArrayList ArrLis
= new CopyOnWriteArrayList();
// Add elements
ArrLis.add(32);
ArrLis.add(67);
ArrLis.add(98);
ArrLis.add(100);
// print CopyOnWriteArrayList
System.out.println("CopyOnWriteArrayList: "
+ ArrLis);
// size value print
System.out.println("size of ArrLis: "
+ ArrLis.size());
}
}
输出:
CopyOnWriteArrayList: [32, 67, 98, 100]
size of ArrLis: 4
方案二:
// Java Program to illustrate the CopyOnWriteArrayList
// size() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArrayList
CopyOnWriteArrayList ArrLis
= new CopyOnWriteArrayList();
// Add elements
ArrLis.add("gopal");
ArrLis.add("gfg");
ArrLis.add("jgec");
ArrLis.add("sudo");
// print CopyOnWriteArrayList
System.out.println("CopyOnWriteArrayList: "
+ ArrLis);
// size value print
System.out.println("size of ArrLis: "
+ ArrLis.size());
}
}
输出:
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]
size of ArrLis: 4
参考: https: Java/util/concurrent/CopyOnWriteArrayList.html#size–