INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: How can i call parameterized constructor if am instantiating a object using "Class.forName("Abc").newInstance()"?

Answer: We can do by the reflection mechanism. For example here is the code.

TestConstructor testConstructor; // This is my class which i want to call.

For arguments of construtor.

Class[] args = new Class[] {String.class} // specify the type of arugument and with no of aruguments.

Declare the value for argument ie. String a1 = "abc";

Object[] argObj = new Object[] {a1}

Get the Construtor object of TestConstructor object i.e

Constructor defaultConstruct = Class.forName("packagename.TestConstructor").getConstructor(args);

TestConstructor test = (TestConstructor) defaultConstruct.newInstance(argObj).

This gives you the class object so u can call repective methods available with the class like test.display();

We can do by the reflection mechanism. For example here is the code.

TestConstructor testConstructor; // This is my class which i want to call.

For arguments of construtor.

Class[] args = new Class[] {String.class} // specify the type of arugument and with no of aruguments.

Declare the value for argument ie. String a1 = "abc";

Object[] argObj = new Object[] {a1}

Get the Construtor object of TestConstructor object i.e

Constructor defaultConstruct = Class.forName("packagename.TestConstructor").getConstructor(args);

TestConstructor test = (TestConstructor) defaultConstruct.newInstance(argObj).

This gives you the class object so u can call repective methods available with the class like test.display();

Source: CoolInterview.com

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