Java中的 CompoundName remove() 方法和示例

javax.naming.CompoundName 类的remove()方法用于从该复合名称中删除位于位置posn的组件。位置posn作为参数传递给此方法。此方法删除此复合名称对象在位置 'posn' 处的组件，并且位于大于 'posn' 的位置处的组件向下移动 1。对象的大小减 1。

句法：

public Object remove(int posn)
       throws InvalidNameException

参数：此方法接受 posn，它是要删除的组件的索引。必须在 [0, size()) 范围内。

返回值：此方法返回已移除的组件（一个字符串）。

异常：此方法抛出ArrayIndexOutOfBoundsException如果 posn 超出指定范围（包括复合名称为空的情况）和 InvalidNameException 如果删除组件将违反复合名称的语法。

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

// Java program to demonstrate
// CompoundName.remove()
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 compound name object
        CompoundName CompoundName1
            = new CompoundName(
                "0@1@2@3@4@5@6@7",
                props);
  
        // apply remove()
        String removedComponent
            = (String)
                  CompoundName1.remove(5);
  
        // print value
        System.out.println(
            "Removed Component: "
            + removedComponent);
        System.out.println(
            "CompoundName After removal:"
            + CompoundName1);
    }
}

输出：

Removed Component: 5
CompoundName After removal:0@1@2@3@4@6@7

方案二：

// Java program to demonstrate
// CompoundName.remove() method
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 compound name object
        CompoundName CompoundName1
            = new CompoundName(
                "c/e/d/v/a/b/z/y/x/f", props);
  
        // apply remove()
        String removedComponent1
            = (String)
                  CompoundName1.remove(1);
  
        // print value
        System.out.println(
            "Removed Component: "
            + removedComponent1);
        System.out.println(
            "CompoundName After removal:"
            + CompoundName1);
  
        // again remove component
        String removedComponent2
            = (String)
                  CompoundName1.remove(2);
  
        // print results
        System.out.println("Removed Component: "
                           + removedComponent2);
        System.out.println("CompoundName After removal:"
                           + CompoundName1);
    }
}

输出：

Removed Component: e
CompoundName After removal:c/d/v/a/b/z/y/x/f
Removed Component: v
CompoundName After removal:c/d/a/b/z/y/x/f

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