Java CompoundName getPrefix()用法及代碼示例

javax.naming.CompoundName類的getPrefix()方法用於獲取複合名稱對象，該複合名稱對象的組件由該複合名稱中的組件前綴組成。我們需要停止從此複合名稱對象中提取前綴的位置作為參數傳遞。返回的複合名稱對象和此複合名稱對象具有相同的語法。如果我們對該複合名稱進行了任何更改，而不會影響返回的名稱，反之亦然。

用法:

public Name getPrefix(int posn)

參數：此方法接受posn，它是要在其處停止的組件的從0開始的索引。必須在[0，size()]範圍內。

返回值：此方法返回一個由[0，posn)範圍內的索引組成的複合名稱。

異常：如果posn在指定範圍之外，則此方法引發ArrayIndexOutOfBoundsException。

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

// Java program to demonstrate 
// CompoundName.getPrefix() 
  
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( 
                "1@2@3@4@5@6@7", 
                props); 
  
        // apply getPrefix() 
        CompoundName newCompoundName 
            = (CompoundName) 
                  CompoundName1 
                      .getPrefix(3); 
  
        // print value 
        System.out.println( 
            "New CompoundName Object:"
            + newCompoundName); 
    } 
}

輸出：

New CompoundName Object:1@2@3

程序2:

// Java program to demonstrate 
// CompoundName.getPrefix() 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 getPrefix() 
        CompoundName newCompoundName 
            = (CompoundName) 
                  CompoundName1.getPrefix(8); 
  
        // print value 
        System.out.println( 
            "New CompoundName Object:"
            + newCompoundName); 
    } 
}

輸出：

New CompoundName Object:c/e/d/v/a/b/z/y

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

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注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 CompoundName getPrefix() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。