Java 中的 ConcurrentSkipListMap 克隆()方法，带示例
原文:https://www . geeksforgeeks . org/concurrentskiplistmap-clone-method-in-Java-with-examples/
java . util . ConcurrentSkipListMap的 clone()方法是 Java 中的一个内置函数，它返回这个 ConcurrentSkipListMap 实例的一个浅拷贝。键和值本身不会被克隆。
语法:
ConcurrentSkipListMap.clone()
参数:函数不接受任何参数。
参数:该方法不接受任何参数。
返回值:函数返回这个 ConcurrentSkipListMap 的一个浅拷贝。
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}
程序二:
// 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:https://docs . Oracle . com/javase/9/docs/API/Java/util/concurrentskiplistmap . html # clone–
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