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Java Field setShort()用法及代碼示例


java.lang.reflect.Field的setShort()方法用於將字段的值設置為指定對象的縮寫。當您需要將對象的字段值設置為短時,可以使用此方法在對象上設置值。

用法:

public void setShort(Object obj, short s)
         throws IllegalArgumentException,
                IllegalAccessException

參數:此方法接受接受兩個參數:


  • obj:是應該修改其字段的對象,並且
  • s:這是要修改的obj字段的新值。

返回:此方法不返回任何內容。

異常:此方法引發以下異常:

  • IllegalAccessException:如果此Field對象正在實施Java語言訪問控製,並且基礎字段是不可訪問的或最終的。
  • IllegalArgumentException:如果指定的對象不是聲明基礎字段(或其子類或實現者)的類或接口的實例,或者展開的轉換失敗。
  • NullPoshorterException:如果指定的對象為null並且該字段是實例字段。
  • ExceptionInInitializerError:如果此方法引發的初始化失敗。

以下示例程序旨在說明setShort()方法:
示例1:

// Java program to illustrate setShort() method 
  
import java.lang.reflect.Field; 
  
public class GFG { 
  
    public static void main(String[] args) 
        throws Exception 
    { 
  
        // create user object 
        Employee emp = new Employee(); 
  
        // print value of uniqueNo 
        System.out.println( 
            "Value of uniqueNo before "
            + "applying setShort is "
            + emp.uniqueNo); 
  
        // Get the field object 
        Field field 
            = Employee.class
                  .getField("uniqueNo"); 
  
        // Apply setShort Method 
        field.setShort(emp, (short)134); 
  
        // print value of uniqueNo 
        System.out.println( 
            "Value of uniqueNo after "
            + "applying setShort is "
            + emp.uniqueNo); 
    } 
} 
  
// sample class 
class Employee { 
  
    // static short values 
    public static short uniqueNo = 239; 
}
輸出:
Value of uniqueNo before applying setShort is 239
Value of uniqueNo after applying setShort is 134

示例2:

// Java Program to illustrate setShort() method 
  
import java.lang.reflect.Field; 
  
public class GFG { 
  
    public static void main(String[] args) 
        throws Exception 
    { 
  
        // create Numbers object 
        Numbers no = new Numbers(); 
  
        // Get the value field object 
        Field field 
            = Numbers.class.getField("value"); 
  
        // Apply setShort Method 
        field.setShort(no, (short)5366); 
  
        // print value of isActive 
        System.out.println( 
            "Value after "
            + "applying setShort is "
            + Numbers.value); 
    } 
} 
  
// sample Numbers class 
class Numbers { 
  
    // static short value 
    public static short value = 13685; 
}
輸出:
Value after applying setShort is 5366

參考文獻: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#setShort-java.lang.Object-short-



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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 Field setShort() 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。