Java中的 CompoundName clone() 方法及示例

javax.naming.CompoundName 类的clone()方法用于返回此复合名称对象的副本。如果您对此原始复合名称的组件进行任何更改，都不会影响 CompoundName 对象的新副本，反之亦然。克隆和此复合名称共享相同的语法。

句法：

public Object clone()

参数：此方法不接受任何内容。

返回值：此方法返回此复合名称的非空副本。

下面的程序说明了 CompoundName.clone() 方法：
方案一：

// Java program to demonstrate
// CompoundName.clone()
  
import java.util.Enumeration;
import java.util.Properties;
  
import javax.naming.CompoundName;
import javax.naming.InvalidNameException;
  
public class GFG {
    public static void main(String[] args)
        throws InvalidNameException
    {
  
        // need properties for CompoundName
        Properties props = new Properties();
        props.put("jndi.syntax.separator", "|");
        props.put("jndi.syntax.direction",
                  "left_to_right");
  
        // create CompoundName object
        CompoundName CompoundName
            = new CompoundName(
                "x|y", props);
  
        // create clone object
        CompoundName cloneCompound
            = (CompoundName)CompoundName
                  .clone();
  
        // print cloned CompoundName
        System.out.println(
            "Clone CompoundName: "
            + cloneCompound);
  
        // print members
        System.out.println("Members:");
        Enumeration enumeration
            = cloneCompound.getAll();
        while (enumeration.hasMoreElements())
            System.out.print(
                enumeration.nextElement() + " ");
    }
}

输出：

Clone CompoundName: x|y
Members:
x y

方案二：

// Java program to demonstrate
// CompoundName.clone() method
  
import java.util.Enumeration;
import java.util.Properties;
import javax.naming.CompoundName;
import javax.naming.InvalidNameException;
  
public class GFG {
    public static void main(String[] args)
        throws InvalidNameException
    {
  
        // need properties for CompoundName
        Properties props = new Properties();
        props.put("jndi.syntax.separator", ":");
        props.put("jndi.syntax.direction",
                  "left_to_right");
  
        // create CompoundName object
        CompoundName CompoundName
            = new CompoundName(
                "x:y:z:a:m:a:q:e",
                props);
  
        // create clone object
        CompoundName cloneCompound
            = (CompoundName)CompoundName
                  .clone();
  
        // print cloned CompoundName
        System.out.println("Clone CompoundName: "
                           + cloneCompound);
  
        // print members
        System.out.println("Members:");
        Enumeration enumeration
            = cloneCompound.getAll();
        int i = 1;
        while (enumeration.hasMoreElements()) {
            System.out.println(i + ":"
                               + enumeration.nextElement());
            i++;
        }
    }
}

输出：

Clone CompoundName: x:y:z:a:m:a:q:e
Members:
1:x
2:y
3:z
4:a
5:m
6:a
7:q
8:e

参考资料：https://docs.oracle.com/javase/10/docs/api/javax/naming/CompoundName.html#clone()