Java ConcurrentSkipListMap clone()方法及示例
java.util.concurrent.ConcurrentSkipListMap 的 clone()方法 是Java中的一个内置函数,它返回该ConcurrentSkipListMap实例的一个浅层拷贝。键和值本身不会被克隆。
语法
ConcurrentSkipListMap.clone()
参数: 该函数不接受任何参数。
参数。此方法不接受任何参数。
返回值: 该函数返回该ConcurrentSkipListMap的一个浅层拷贝。
下面的程序说明了上述方法。
程序1:
// Java Program Demonstrate clone()
// method of ConcurrentSkipListMap
import java.util.concurrent.ConcurrentSkipListMap;
class GFG {
public static void main(String[] args)
{
// Initializing the map
// using ConcurrentSkipListMap()
ConcurrentSkipListMap<Integer, Integer> mpp
= new ConcurrentSkipListMap<Integer,
Integer>();
// Adding elements to this map
mpp.put(1, 1);
mpp.put(5, 2);
mpp.put(2, 7);
// Printing the ConcurrentSkipListMap
System.out.println("Map: " + mpp);
// Cloning the ConcurrentSkipListMap
ConcurrentSkipListMap<Integer, Integer>
clone_mpp = mpp.clone();
// Adding elements to the clone map
clone_mpp.put(7, 9);
System.out.println("Cloned map is: "
+ clone_mpp);
}
}
输出。
Map: {1=1, 2=7, 5=2}
Cloned map is: {1=1, 2=7, 5=2, 7=9}
程序2
// Java Program Demonstrate clone()
// method of ConcurrentSkipListMap
import java.util.concurrent.ConcurrentSkipListMap;
class GFG {
public static void main(String[] args)
{
// Initializing the map
// using ConcurrentSkipListMap()
ConcurrentSkipListMap<Integer, Integer>
mpp = new ConcurrentSkipListMap<Integer,
Integer>();
// Adding elements to this map
mpp.put(10, 5);
mpp.put(54, 20);
mpp.put(2, 7);
// Printing the ConcurrentSkipListMap
System.out.println("Map: " + mpp);
// Cloning the ConcurrentSkipListMap
ConcurrentSkipListMap<Integer, Integer>
clone_mpp = mpp.clone();
// Adding elements to the clone map
clone_mpp.put(17, 9);
System.out.println("Cloned map is: "
+ clone_mpp);
}
}
输出。
Map: {2=7, 10=5, 54=20}
Cloned map is: {2=7, 10=5, 17=9, 54=20}
参考资料: https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentSkipListMap.html#clone-