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Java FieldPosition getField()用法及代碼示例


java.text.FieldPosition類的getField()方法用於檢索此字段位置對象的字段標識符。

用法:

public int getField()

參數:此方法不接受任何參數作為參數。


返回值:此方法返回此字段位置對象的字段標識符。

下麵是說明getField()方法的示例:

範例1:

// Java program to demonstrate 
// getField() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        try { 
  
            // Creating and initializing 
            // new FieldPosition Object 
            FieldPosition pos 
                = new FieldPosition( 
                    MessageFormat.Field.ARGUMENT); 
  
            // getting Field attribute 
            // of FieldPosition object 
            // using getField() mehtod 
            int i = pos.getField(); 
  
            // display result 
            System.out.println( 
                "field attribute:- "
                + Integer.toString(i)); 
        } 
  
        catch (ClassCastException e) { 
  
            System.out.println("Exception thrown:" + e); 
        } 
    } 
}
輸出:
field attribute:- -1

範例2:

// Java program to demonstrate 
// getField() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        try { 
  
            // Creating and initializing 
            // new FieldPosition Object 
            FieldPosition pos 
                = new FieldPosition( 
                    DateFormat.Field.AM_PM); 
  
            // getting Field attribute 
            // of FieldPosition object 
            // using getField() mehtod 
            int i = pos.getField(); 
  
            // display result 
            System.out.println( 
                "field attribute:- "
                + Integer.toString(i)); 
        } 
  
        catch (ClassCastException e) { 
  
            System.out.println("Exception thrown:" + e); 
        } 
    } 
}
輸出:
field attribute:- -1

參考: https://docs.oracle.com/javase/9/docs/api/java/text/FieldPosition.html#getField-



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注:本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 FieldPosition getField() method in Java with Example。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。