Java中的 CompoundName isEmpty() 方法和示例

javax.naming.CompoundName 类的isEmpty()方法用于检查此复合名称对象是否为空。如果复合名称的组成部分为零，则称该复合名称为空。

句法：

public boolean isEmpty()

参数：此方法不接受任何内容。

返回值：如果此复合名称为空，则此方法返回 true，否则返回 false。

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

// Java program to demonstrate
// CompoundName.isEmpty()
  
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(
                "a:b:z:y:x", props);
  
        // apply isEmpty()
        boolean isEmpty
            = CompoundName1.isEmpty();
  
        // print value
        System.out.println("This Compound "
                           + "object is empty:"
                           + isEmpty);
    }
}

输出：

This Compound object is empty:false

方案二：

// Java program to demonstrate
// CompoundName.isEmpty() 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(
                "", props);
  
        // apply isEmpty()
        boolean isEmpty
            = CompoundName1.isEmpty();
  
        // print value
        System.out.println("This Compound "
                           + "object is empty:"
                           + isEmpty);
    }
}

输出：

This Compound object is empty:true

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