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📜  Java中的 CopyOnWriteArrayList size() 方法

📅  最后修改于: 2022-05-13 01:54:26.378000             🧑  作者: Mango

Java中的 CopyOnWriteArrayList size() 方法

CopyOnWriteArrayListsize()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–