IdentityHashMap类clone()方法 (IdentityHashMap Class clone() method)

• clone() method is available in java.util package.

  clone()方法在java.util包中可用。

• clone() method is used to return a shallow copy of this IdentityHashMap.

  clone()方法用于返回此IdentityHashMap的浅表副本。

• clone() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  clone()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• clone() method does not throw an exception at the time of cloning an object.

  clone()方法在克隆对象时不会引发异常。

Syntax:

句法：

public Object clone();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is Object, it returns cloned copy of this IdentityHashMap.

方法的返回类型为Object ，它返回此IdentityHashMap的克隆副本。

Example:

例：

// Java program to demonstrate the example // of Object clone() method of IdentityHashMap import java.util.*;public class CloneOfIdentityHashMap {
       public static void main(String[] args) {
           // Instantiates a IdentityHashMap object        IdentityHashMap < Integer, String > ihm = new IdentityHashMap < Integer, String > ();        IdentityHashMap < Integer, String > clone_map = new IdentityHashMap < Integer, String > ();        // By using put() method is to add        // key-value pairs in a IdentityHashMap        ihm.put(10, "C");        ihm.put(20, "C++");        ihm.put(50, "JAVA");        ihm.put(40, "PHP");        ihm.put(30, "SFDC");        // Display IdentityHashMap and clone_map        System.out.println("IdentityHashMap: " + ihm);        System.out.println("CloneMap: " + clone_map);        // By using clone() method is to clone        // this object        clone_map = (IdentityHashMap) ihm.clone();        // Display clone_map        System.out.println("ihm.clone(): " + clone_map);    }}

Output

输出量

IdentityHashMap: {20=C++, 40=PHP, 50=JAVA, 30=SFDC, 10=C}CloneMap: {}ihm.clone(): {20=C++, 40=PHP, 50=JAVA, 30=SFDC, 10=C}

翻译自: