Java CompoundName isEmpty()用法及代碼示例

javax.naming.CompoundName類的isEmpty()方法用於檢查此化合物名稱對象是否為空。如果複合名稱具有零個組成部分，則稱該名稱為空。

用法:

public boolean isEmpty()

參數：此方法不接受任何內容。

返回值：如果此化合物名稱為空，則此方法返回true，否則返回false。

以下示例程序旨在說明CompoundName.isEmpty()方法：
程序1:

// 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); 
    } 
}

輸出：

This Compound object is empty:false

程序2:

// 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); 
    } 
}

輸出：

This Compound object is empty:true

參考文獻：https://docs.oracle.com/javase/10/docs/api/javax/naming/CompoundName.html#isEmpty()

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