java.lang.reflect.Field的setBoolean()方法用于將字段的值設置為指定對象上的布爾值。當需要將對象的字段的值設置為布爾值時，可以使用此方法在對象上設置值。

用法:

public void setBoolean(Object obj, boolean z)

throws IllegalArgumentException,

IllegalAccessException

參數：此方法接受兩個參數：

obj：是應該修改其字段的對象，并且

z：這是要修改的obj字段的新值。

返回值：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語言訪問控制，并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。

NullPointerException：如果指定的對象為null并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setBoolean()方法：

示例1:

// Java program to illustrate setBoolean() method

import java.lang.reflect.Field;

public class GFG {

public static void main(String[] args)

throws Exception

{

// create user object

User user = new User();

// print value of isActive

System.out.println("Value before "

+ "applying setBoolean is "

+ user.isActive);

// Get the marks field object

Field field

= User.class

.getField("isActive");

// Apply setBoolean Method

field.setBoolean(field, false);

// print result

System.out.println("Value after "

+ "applying setBoolean is "

+ user.isActive);

}

}

// sample User class

class User {

// static boolean values

public static boolean isActive = true;

}

輸出：

Value before applying setBoolean is true

Value after applying setBoolean is false

示例2:

// Java program to illustrate setBoolean() 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 isManager

System.out.println("Value of isManager before "

+ "applying setBoolean is "

+ emp.isManager);

// Get the marks field object

Field field

= Employee.class

.getField("isManager");

// Apply setBoolean Method

field.setBoolean(emp, false);

// print value of isActive

System.out.println("Value of isPresent before "

+ "applying setBoolean is "

+ emp.isManager);

// print value of isManager

System.out.println("Value of isManager before "

+ "applying setBoolean is "

+ emp.isPresent);

// Get the marks field object

field = Employee.class

.getField("isPresent");

// Apply setBoolean Method

field.setBoolean(emp, true);

// print value of isActive

System.out.println("Value of isPresent before "

+ "applying setBoolean is "

+ emp.isPresent);

}

}

// sample User class

class Employee {

// static boolean values

public static boolean isPresent = false;

public static boolean isManager = true;

}

輸出：

Value of isManager before applying setBoolean is true

Value of isPresent before applying setBoolean is false

Value of isManager before applying setBoolean is false

Value of isPresent before applying setBoolean is true

總結

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