Java中的字段 getName() 方法及示例

Java.lang.reflect.Field的getName()方法用于获取此Field 对象所代表的字段的名称。当一个类包含一个字段并且我们想要获取该字段的名称时，我们可以使用此方法返回字段的名称。

句法：

public String getName()

参数：此方法不接受任何内容。

返回值：此方法返回一个字符串，它是基础成员的简单名称。

下面的程序说明了 getName() 方法：
方案一：

// 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;
    }
}

输出：

Name is Marks
Name is Fees
Name is name

方案二：

// 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());
        }
    }
}

输出：

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

参考： https: Java/lang/reflect/Field.html#getName–