java 带有构造函数参数的动态Java类
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Java Class Dynamically with Constructor parameter
提问by Makky
I have to create a class dynamically but I want to use class constructor passing parameter.
我必须动态创建一个类，但我想使用类构造函数传递参数。
Currently my code looks like
目前我的代码看起来像
Class<HsaInterface> _tempClass = (Class<HsaInterface>) Class.forName(hsaClass);
_tempClass.getDeclaredConstructor(String.class);
HsaInterface hsaAdapter = _tempClass.newInstance();
hsaAdapter.executeRequestTxn(txnData);
How can I call the constructor with the parameter ?
如何使用参数调用构造函数？
回答by millimoose
You got close, getDeclaredConstructor()returns a Constructorobject you're supposed to be using. Also, you need to pass a Stringobject to the newInstance()method of that Constructor.
你接近了，getDeclaredConstructor()返回一个Constructor你应该使用的对象。此外，您需要将一个String对象传递给newInstance()that的方法Constructor。
Class<HsaInterface> _tempClass = (Class<HsaInterface>) Class.forName(hsaClass);
Constructor<HsaInterface> ctor = _tempClass.getDeclaredConstructor(String.class);
HsaInterface hsaAdapter = ctor.newInstance(aString);
hsaAdapter.executeRequestTxn(txnData);
回答by Saul
Class<HsaInterface> _tempClass = (Class<HsaInterface>) Class.forName(hsaClass);
// Gets the constructor instance and turns on the accessible flag
Constructor ctor = _tempClass.getDeclaredConstructor(String.class);
ctor.setAccessible(true);
// Appends constructor parameters
HsaInterface hsaAdapter = ctor.newInstance("parameter");
hsaAdapter.executeRequestTxn(txnData);
回答by Bala R
Constructor constructor = _tempClass.getDeclaredConstructor(String.class);
Object obj = constructor.newInstance("some string");
