java.lang.reflect.Field的setInt()方法用于将字段的值设置为指定对象上的int值。当需要将对象的字段值设置为int时,可以使用此方法在对象上设置值。
用法:
public void setInt(Object obj, int i) throws IllegalArgumentException, IllegalAccessException
参数:此方法接受接受两个参数:
- obj:是应该修改其字段的对象,并且
- i:这是要修改的obj字段的新值。
返回:此方法不返回任何内容。
异常:此方法引发以下异常:
- IllegalAccessException:如果此Field对象正在强制执行Java语言访问控制,并且基础字段是不可访问的或最终的。
- IllegalArgumentException:如果指定的对象不是声明基础字段(或其子类或实现者)的类或接口的实例,或者展开转换失败。
- NullPointerException:如果指定的对象为null,并且该字段是实例字段。
- ExceptionInInitializerError:如果此方法引发的初始化失败。
以下示例程序旨在说明setInt()方法:
示例1:
// Java program to illustrate setInt() 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 salary
System.out.println(
"Value of salary before "
+ "applying setInt is "
+ emp.salary);
// Get the field object
Field field = Employee.class.getField("salary");
// Apply setInt Method
field.setInt(emp, 2243599);
// print value of salary
System.out.println(
"Value of salary after "
+ "applying setInt is "
+ emp.salary);
// print value of uniqueNo
System.out.println(
"Value of uniqueNo before "
+ "applying setInt is "
+ emp.uniqueNo);
// Get the field object
field = Employee.class.getField("uniqueNo");
// Apply setInt Method
field.setInt(emp, 123434);
// print value of uniqueNo
System.out.println(
"Value of uniqueNo after "
+ "applying setInt is "
+ emp.uniqueNo);
}
}
// sample class
class Employee {
// static int values
public static int uniqueNo = 234289;
public static int salary = 1125213;
}
输出:
Value of salary before applying setInt is 1125213 Value of salary after applying setInt is 2243599 Value of uniqueNo before applying setInt is 234289 Value of uniqueNo after applying setInt is 123434
示例2:
// Java program to illustrate setInt() 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 setInt Method
field.setInt(no, 53266);
// print value of isActive
System.out.println(
"Value after "
+ "applying setInt is "
+ Numbers.value);
}
}
// sample Numbers class
class Numbers {
// static int value
public static int value = 13685;
}
输出:
Value after applying setInt is 53266
参考: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#setInt-java.lang.Object-int-
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