Java CopyOnWriteArrayList hashCode()方法

CopyOnWriteArrayList 的 hashCode() 方法返回该列表的hashCode值。

语法

public int hashCode()

参数： 该函数不接受任何参数。

返回值： 该函数返回列表的hashCode值。

下面的程序说明了上述函数。

程序1 :

// Java Program to illustrate the CopyOnWriteArrayList
// hashCode() 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<Integer> ArrLis
            = new CopyOnWriteArrayList<Integer>();
  
        // Add elements
        ArrLis.add(32);
        ArrLis.add(67);
        ArrLis.add(98);
        ArrLis.add(100);
  
        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                         + ArrLis);
  
        // hashCode value print
        System.out.println("hashCode value: " 
                          + ArrLis.hashCode());
    }
}

输出。

CopyOnWriteArrayList: [32, 67, 98, 100]
hashCode value: 1944358

程序2

// Java Program to illustrate the CopyOnWriteArrayList
// hashCode() 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<String> ArrLis
            = new CopyOnWriteArrayList<String>();
  
        // Add elements
        ArrLis.add("gopal");
        ArrLis.add("gfg");
        ArrLis.add("jgec");
        ArrLis.add("sudo");
  
        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                            + ArrLis);
  
        // hashCode value print
        System.out.println("hashCode value: " 
                          + ArrLis.hashCode());
    }
}

输出。

CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]
hashCode value: -1942417272

参考资料: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#hashCode-