有没有办法像 isPrimitive() 一样查找 Field 是否为布尔值？

Question

有没有一种方法可以像 isPrimitive() 一样在 Java 反射中查找 Field 是否为 boolean ？

Field fieldlist[] = clazz.getDeclaredFields();
for (int i = 0; fieldlist.length & gt; i; i++) {
 Field fld = fieldlist[i];
 if (fld.getClass().isPrimitive()) {
  fld.setInt(object, 0);
  continue;
 }
}

Answer 1

if(fld.getType().equals(boolean.class))

刚刚对此进行了测试，它适用于原始布尔变量。

Answer 2

我相信 Boolean.class.isAssignableFrom(fld.getClass()) 可用于确定该字段是否为布尔值。不过，我还没有机会测试这是否适用于基元。

Answer 3

试试这个（

public boolean getBoolean(Object obj)
               throws IllegalArgumentException,
                      IllegalAccessException

Gets the value of a static or instance boolean field.

Parameters:
    obj - the object to extract the boolean value from 
Returns:
    the value of the boolean field 
Throws:
    IllegalAccessException - if the underlying field is inaccessible. 
    IllegalArgumentException - if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), **or if the field value cannot be converted to the type boolean** by a widening conversion. 
    NullPointerException - if the specified object is null and the field is an instance field. 
    ExceptionInInitializerError - if the initialization provoked by this method fails.

Answer 4

这适用于原语和对象：

boolean isBooleanType = field.getType().equals(boolean.class) || field.getType().equals(Boolean.class);