Java Field getName()用法及代碼示例

java.lang.reflect.Field的getName()方法用於獲取由此Field對象表示的字段的名稱。當一個類包含一個字段並且我們想要獲取該字段的名稱時，我們可以使用此方法返回Field的名稱。

用法:

public String getName()

參數：此方法不接受任何內容。

返回值：此方法返回一個String，它是基礎成員的簡單名稱。

以下示例程序旨在說明getName()方法：
示例1:

// Java program to demonstrate getName() method 
  
import java.lang.reflect.Field; 
  
public class GFG { 
  
    public static void main(String[] args) 
        throws Exception 
    { 
  
        // Get the marks field object 
        Field field = User.class
.getField("Marks"); 
  
        // Apply getName Method on User Object 
        // to get the name of Marks field 
        String value = field.getName(); 
  
        // print result 
        System.out.println("Name"
                           + " is " + value); 
  
        // Now Get the Fees field object 
        field = User.class.getField("Fees"); 
  
        // Apply getName Method on User Object 
        // to get the name of Fees field 
        value = field.getName(); 
  
        // print result 
        System.out.println("Name"
                           + " is " + value); 
  
        // Now Get the name field object 
        field = User.class.getField("name"); 
  
        // Apply getName Method on User Object 
        // to get the name of name field 
        value = field.getName(); 
  
        // print result 
        System.out.println("Name"
                           + " is " + value); 
    } 
} 
  
// sample User class 
class User { 
  
    // static double values 
    public static double Marks = 34.13; 
    public static float Fees = 3413.99f; 
    public static String name = "Aman"; 
  
    public static double getMarks() 
    { 
        return Marks; 
    } 
  
    public static void setMarks(double marks) 
    { 
        Marks = marks; 
    } 
  
    public static float getFees() 
    { 
        return Fees; 
    } 
  
    public static void setFees(float fees) 
    { 
        Fees = fees; 
    } 
  
    public static String getName() 
    { 
        return name; 
    } 
  
    public static void setName(String name) 
    { 
        User.name = name; 
    } 
}

輸出：

Name is Marks
Name is Fees
Name is name

示例2:

// Java program to demonstrate getName() method 
  
import java.lang.reflect.Field; 
import java.time.Month; 
  
public class GFG { 
  
    public static void main(String[] args) 
        throws Exception 
    { 
  
        // Get all field objects of Month class 
        Field[] fields = Month.class.getFields(); 
  
        for (int i = 0; i < fields.length; i++) { 
  
            // print name of Fields 
            System.out.println("Name of Field:"
                               + fields[i].getName()); 
        } 
    } 
}

輸出：

Name of Field:JANUARY
Name of Field:FEBRUARY
Name of Field:MARCH
Name of Field:APRIL
Name of Field:MAY
Name of Field:JUNE
Name of Field:JULY
Name of Field:AUGUST
Name of Field:SEPTEMBER
Name of Field:OCTOBER
Name of Field:NOVEMBER
Name of Field:DECEMBER

參考文獻： https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#getName–

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