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How to let a derived class in a parameterized constructor chain access fields of the base class that are initialized using the derived constructor
Initialize class fields in constructor or at declaration?Accessing constructor of an anonymous classOrder of constructors for a C# class: parameterized, default, and static?C# constructor chaining? (How to do it?)While constructing the default constructor can not handle exception : type Exception thrown by implicit super constructorchaining constructors in Java without throwing exceptions from the default constructorWhy Java StringReader throws IOException?Chain Constructor from parents classAll reflection methods accessing constructor of class generated through ASM throw NoClassDefFoundError if class references primitive type
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I have a class Feedforward with a parameterized constructor of a configuration file:
public Feedforward(String cfg) throws Exception {
super(cfg);
String tempstr = "";
int currNeuronNum = 0;
int currEdgeNum = 0;
int currLayerID = 0;
int count = 0;
if (!(type).equals("feedforward"))
throw new Exception("cfgError: specify proper type")
//more code
where the super(cfg) calls the constructor of the Network class, where I handle file parsing and storage of universal fields:
protected Network(String cfgPath) throws IOException, Exception
String type;
String activationFunction;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
and when I run a test, it throws a NullPointerException. The type variable in Feedforward is not assigned with the value stored in the file at cfgPath/cfg, hence the exception. Why doesn't constructor chaining do this, and how can I do things differently?
java object constructor constructor-chaining
asked Mar 27 at 2:52
Duncan WDuncan W
113 bronze badges
add a comment |
I have a class Feedforward with a parameterized constructor of a configuration file:
public Feedforward(String cfg) throws Exception {
super(cfg);
String tempstr = "";
int currNeuronNum = 0;
int currEdgeNum = 0;
int currLayerID = 0;
int count = 0;
if (!(type).equals("feedforward"))
throw new Exception("cfgError: specify proper type")
//more code
where the super(cfg) calls the constructor of the Network class, where I handle file parsing and storage of universal fields:
protected Network(String cfgPath) throws IOException, Exception
String type;
String activationFunction;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
and when I run a test, it throws a NullPointerException. The type variable in Feedforward is not assigned with the value stored in the file at cfgPath/cfg, hence the exception. Why doesn't constructor chaining do this, and how can I do things differently?
java object constructor constructor-chaining
asked Mar 27 at 2:52
Duncan WDuncan W
113 bronze badges
add a comment |
I have a class Feedforward with a parameterized constructor of a configuration file:
public Feedforward(String cfg) throws Exception {
super(cfg);
String tempstr = "";
int currNeuronNum = 0;
int currEdgeNum = 0;
int currLayerID = 0;
int count = 0;
if (!(type).equals("feedforward"))
throw new Exception("cfgError: specify proper type")
//more code
where the super(cfg) calls the constructor of the Network class, where I handle file parsing and storage of universal fields:
protected Network(String cfgPath) throws IOException, Exception
String type;
String activationFunction;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
and when I run a test, it throws a NullPointerException. The type variable in Feedforward is not assigned with the value stored in the file at cfgPath/cfg, hence the exception. Why doesn't constructor chaining do this, and how can I do things differently?
java object constructor constructor-chaining
asked Mar 27 at 2:52
Duncan WDuncan W
113 bronze badges
I have a class Feedforward with a parameterized constructor of a configuration file:
public Feedforward(String cfg) throws Exception {
super(cfg);
String tempstr = "";
int currNeuronNum = 0;
int currEdgeNum = 0;
int currLayerID = 0;
int count = 0;
if (!(type).equals("feedforward"))
throw new Exception("cfgError: specify proper type")
//more code
where the super(cfg) calls the constructor of the Network class, where I handle file parsing and storage of universal fields:
protected Network(String cfgPath) throws IOException, Exception
String type;
String activationFunction;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
and when I run a test, it throws a NullPointerException. The type variable in Feedforward is not assigned with the value stored in the file at cfgPath/cfg, hence the exception. Why doesn't constructor chaining do this, and how can I do things differently?
java object constructor constructor-chaining
java object constructor constructor-chaining
asked Mar 27 at 2:52
Duncan WDuncan W
113 bronze badges
asked Mar 27 at 2:52
Duncan WDuncan W
113 bronze badges
asked Mar 27 at 2:52
Duncan WDuncan W
113 bronze badges
asked Mar 27 at 2:52
Duncan WDuncan W
113 bronze badges
asked Mar 27 at 2:52
Duncan WDuncan W
113 bronze badges
113 bronze badges
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Because type is local variable of a method (in this case constructor), though Network is a super class but we cannot access a local variable of any method out side it.
you can make String type=""; as a variable out side constructor , then just assign the value in side Network constructor.
and you can use it in Feedforward class.
public class Network
String type="";
protected Network(String cfgPath) throws IOException, Exception
type=cfgPath;
String activationFunction=cfgPath;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
answered Mar 27 at 3:33
purvaBpurvaB
494 bronze badges
add a comment |
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1 Answer
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1 Answer
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active
oldest
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active
oldest
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active
oldest
votes
Because type is local variable of a method (in this case constructor), though Network is a super class but we cannot access a local variable of any method out side it.
you can make String type=""; as a variable out side constructor , then just assign the value in side Network constructor.
and you can use it in Feedforward class.
public class Network
String type="";
protected Network(String cfgPath) throws IOException, Exception
type=cfgPath;
String activationFunction=cfgPath;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
answered Mar 27 at 3:33
purvaBpurvaB
494 bronze badges
add a comment |
Because type is local variable of a method (in this case constructor), though Network is a super class but we cannot access a local variable of any method out side it.
you can make String type=""; as a variable out side constructor , then just assign the value in side Network constructor.
and you can use it in Feedforward class.
public class Network
String type="";
protected Network(String cfgPath) throws IOException, Exception
type=cfgPath;
String activationFunction=cfgPath;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
answered Mar 27 at 3:33
purvaBpurvaB
494 bronze badges
add a comment |
Because type is local variable of a method (in this case constructor), though Network is a super class but we cannot access a local variable of any method out side it.
you can make String type=""; as a variable out side constructor , then just assign the value in side Network constructor.
and you can use it in Feedforward class.
public class Network
String type="";
protected Network(String cfgPath) throws IOException, Exception
type=cfgPath;
String activationFunction=cfgPath;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
answered Mar 27 at 3:33
purvaBpurvaB
494 bronze badges
Because type is local variable of a method (in this case constructor), though Network is a super class but we cannot access a local variable of any method out side it.
you can make String type=""; as a variable out side constructor , then just assign the value in side Network constructor.
and you can use it in Feedforward class.
public class Network
String type="";
protected Network(String cfgPath) throws IOException, Exception
type=cfgPath;
String activationFunction=cfgPath;
double bias;
/*file reading stuff; checked with print statements and during
the creation of a Feedforward class, successfully prints
"feedforward" after reading type from file
*/
answered Mar 27 at 3:33
purvaBpurvaB
494 bronze badges
answered Mar 27 at 3:33
purvaBpurvaB
494 bronze badges
answered Mar 27 at 3:33
purvaBpurvaB
494 bronze badges
answered Mar 27 at 3:33
purvaBpurvaB
494 bronze badges
494 bronze badges
add a comment |
add a comment |
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