methods and construtors

[pattanaikhr]

How can we get methods name and costructors name from java class before compilation?Please any body have any idea plaese share with me

[hirak1984]

[font=Verdana][size=2]question not clear at all.What are you trying to do please explain in details.[/size][/font]

How can we get methods name and costructors name from java class before compilation?Please any body have any idea plaese share with me

[r035198x]

How can we get methods name and costructors name from java class before compilation?Please any body have any idea plaese share with me

Please expalin what you mean by "before compilation".

[pattanaikhr]

Hi ,
I have one java class like test.java

public class test{


boolean packFrame = false;

private int a,b;
public test() {


System.out.println("Hi");
}
public static final void test45 (int i) {
int a=0,b=1;
if(a==b){
System.out.println("test");
}
System.out.println("Hi");
}

public static int test123 (int i,String s,int k) {


System.out.println("Hi");
return 5;
}

public void vee(int i){

try{
i +=1;
sum( a, b);
}
catch(Exception e){

}
}
public void sum(int a,int b){




try {
int sumab=0;
sumab= a+b;
} catch (RuntimeException e) {

e.printStackTrace();
}
}

I want this methods name and constructors name before compile this java class..

Please expalin what you mean by "before compilation".

[pattanaikhr]

output like
constructor :
test()
methods name : test45,test123,sum

Hi ,
I have one java class like test.java

public class test{


boolean packFrame = false;

private int a,b;
public test() {


System.out.println("Hi");
}
public static final void test45 (int i) {
int a=0,b=1;
if(a==b){
System.out.println("test");
}
System.out.println("Hi");
}

public static int test123 (int i,String s,int k) {


System.out.println("Hi");
return 5;
}

public void vee(int i){

try{
i +=1;
sum( a, b);
}
catch(Exception e){

}
}
public void sum(int a,int b){




try {
int sumab=0;
sumab= a+b;
} catch (RuntimeException e) {

e.printStackTrace();
}
}

I want this methods name and constructors name before compile this java class..

[hirak1984]

you are confusing us.

which method name do you want?
And where is the " main " method in your code?
where from will the code start to compile or run?
is this your first java program?just go through some examples of writing a java program first.

Hi ,
I have one java class like test.java

public class test{


boolean packFrame = false;

private int a,b;
public test() {


System.out.println("Hi");
}
public static final void test45 (int i) {
int a=0,b=1;
if(a==b){
System.out.println("test");
}
System.out.println("Hi");
}

public static int test123 (int i,String s,int k) {


System.out.println("Hi");
return 5;
}

public void vee(int i){

try{
i +=1;
sum( a, b);
}
catch(Exception e){

}
}
public void sum(int a,int b){




try {
int sumab=0;
sumab= a+b;
} catch (RuntimeException e) {

e.printStackTrace();
}
}

I want this methods name and constructors name before compile this java class..

[pattanaikhr]

suppose this test.java class has save in different location , another one xyz.java , which can read test. java , and when we will compile xyz.java , that time it'll give test.java methods name and constructors name like test,test45,test123,sum.

you are confusing us.

which method name do you want?
And where is the " main " method in your code?
where from will the code start to compile or run?
is this your first java program?just go through some examples of writing a java program first.

[r035198x]

I'm not sure what you are trying to do here but you can have a look at the reflection API and see if that's what you want.

[pattanaikhr]

I know that through reflection it's possible , but this case we need compile first,
without compile the java class how can we get method name and constructor name?

I'm not sure what you are trying to do here but you can have a look at the reflection API and see if that's what you want.

[r035198x]

I know that through reflection it's possible , but this case we need compile first,
without compile the java class how can we get method name and constructor name?

Well you should realize then that the jvm won't have anything to do with it until you have created a class file. So you have to manipulate it as you would a text file. You'd have to open it using FileReader or Scanner and try to extract the function names. The constructors are easy to get but the method names require a bit more analysis.

[hirak1984]

Ya I too cant find any other way.But why do you need to get the names before compilation?Not clear!

Well you should realize then that the jvm won't have anything to do with it until you have created a class file. So you have to manipulate it as you would a text file. You'd have to open it using FileReader or Scanner and try to extract the function names. The constructors are easy to get but the method names require a bit more analysis.

[pattanaikhr]

Yes that is right , but if any method is available in java API which is providing get method and constructors name before compile.Because if we'll think about ur suggestion for generic, then it's too difficult , the different programmer have different coding style. So getting method name is also difficult
You told that constructor is get too easy but I'm giving one example here
Suppose Test.java is class
public class Test{
test(){ --------------->constructor
System.out.println("Hi");
}
public void test(){ --------> Method
System.out.println("Hi");
}

Then how can we will differentiate here?

Well you should realize then that the jvm won't have anything to do with it until you have created a class file. So you have to manipulate it as you would a text file. You'd have to open it using FileReader or Scanner and try to extract the function names. The constructors are easy to get but the method names require a bit more analysis.

[pattanaikhr]

Because my requirement like that

Ya I too cant find any other way.But why do you need to get the names before compilation?Not clear!

[r035198x]

Yes that is right , but if any method is available in java API which is providing get method and constructors name before compile.Because if we'll think about ur suggestion for generic, then it's too difficult , the different programmer have different coding style. So getting method name is also difficult
You told that constructor is get too easy but I'm giving one example here
Suppose Test.java is class
public class Test{
test(){ --------------->constructor
System.out.println("Hi");
}
public void test(){ --------> Method
System.out.println("Hi");
}

Then how can we will differentiate here?

public class Test{
test(){ --------------->constructor
Wrong!

test() is not a constructor. Java is case sensitive.
To find the constructor you have to find where the name exactly matches the name of the class and then you would have to see what modifier was used for it e.g

 public class Test{ 
Test(){ --------------->constructor
}
void Test() {//-------->not a constructor
}
 

It is possible to get them including the methods as well if you do your design right but the work required is almost as much as that required to write a compiler.

[pattanaikhr]

Yes that is right java is case sensitive ,

ok Test(){---------> constructor
}

public void Test(){-------->method.

}

void Test(){------>
}
then how can we differentiate method and constructor

public class Test{
test(){ --------------->constructor
Wrong!

test() is not a constructor. Java is case sensitive.
To find the constructor you have to find where the name exactly matches the name of the class and then you would have to see what modifier was used for it e.g

 public class Test{ 
Test(){ --------------->constructor
}
void Test() {//-------->not a constructor
}
 

It is possible to get them including the methods as well if you do your design right but the work required is almost as much as that required to write a compiler.

[r035198x]

Yes that is right java is case sensitive ,

ok Test(){---------> constructor
}

public void Test(){-------->method.

}

void Test(){------>
}
then how can we differentiate method and constructor

That's the example I just gave and I did say that you'd then have to check the modifier that was used. e.g if the modifier is public or protected then it's a constructor, if there is no modifier, then it's a constructor again, otherwise it's a method.

However, to get it to work properly you'd need to parse the program first breaking it up into statements so that you have a statement on each line ...