Java Field toString()方法及示例

java.lang.reflect.Field 的 toString() 方法用于获取描述此Field的字符串。返回的字符串的格式是该字段的访问修饰符（如果有的话），后面是字段类型，后面是空格，后面是声明该字段的类的全称，后面是句号，后面是该字段的名称。

比如说 。

public static final Month java.time.Month.APRIL

这些修饰符是按照《Java语言规范》规定的规范顺序放置的。首先是public、protected或private，然后是其他修饰符，顺序如下：static、final、transient、volatile。

语法

public String toString()

参数： 此方法不接受任何东西。

返回值： 该方法返回一个描述该字段的 字符串 。

下面的程序说明了toString()方法：
程序1 :

// Java program to illustrate toString() method
  
import java.lang.reflect.Field;
  
public class GFG {
  
    public static void main(String[] args)
        throws Exception
    {
  
        // Get the array of field object
        Field[] fields = User.class.getFields();
  
        // loop
        for (int i = 0; i < fields.length; i++) {
  
            // get the string representation of each field
            String field = fields[i].toString();
  
            System.out.println("Field: " + field);
        }
    }
}
  
// 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:

Field: public static double User.Marks
Field: public static float User.Fees
Field: public static java.lang.String User.name

程序2

// Java program to illustrate toString() 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("toString of Field:\n"
                               + fields[i].toString());
        }
    }
}

输出:

toString of Field:  
public static final java.time.Month java.time.Month.January  
toString of Field:  
public static final java.time.Month java.time.Month.FebRUARY  
toString of Field:  
public static final java.time.Month java.time.Month。MARCH  
toString of Field:  
public static final java.time.Month java.time.Month.APRIL  
toString of Field:  
public static final java.time.Month java.time.Month.May  
toString of Field:  
public static final java.time.Month java.time.Month.6月  
toString of Field:  
public static final java.time.Month java.time.Month.July  
toString of Field:  
public static final java.time.Month java.time.Month.AUGUST  
toString of Field:  
public static final java.time.Month java.time.Month.SEPTEMBER  
toString of Field:  
public static final java.time.Month java.time.Month.OctOBER  
toString of Field:  
public static final java.time.Month java.time.Month.NOVEMBER  
toString of Field:  
public static final java.time.Month java.time.Month.DecEMBER

引用：https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#toString-