list of loop objects...

M

mai

Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:

package loop;
import java.util.ArrayList;
import java.util.List;

public class Loop{
public int level;
public int counter1;
public int counter2;
public int counter3;

public Loop(int level,int c1, int c2, int c3){
this.level=level;
counter1 = c1;
counter2 = c2;
counter3 = c3;
}
public static List<Loop> doLoops() {
List<Loop> result = new ArrayList<Loop>();
int cnt1=0;
int cnt2=0;
int cnt3=0;

outer: for(;;){
Loop ob1;
ob1= new Loop(1, cnt1, cnt2, cnt3);
result.add(ob1);
cnt1 +=1;


middle: for(;;){
Loop ob2;
ob2= new Loop(2,cnt1,cnt2,cnt3);
result.add(ob2);
cnt2+= 1;

inner : for(;;){
Loop ob3;
ob3 = new Loop(3,cnt1,cnt2,cnt3);
result.add(ob3);
cnt3 +=1;

if (cnt3 % 5 == 0)
break inner;

if (cnt3 % 11 == 0)
break middle;

if (cnt3 % 14 == 0)
break outer;

}
}
}
return result;
}

public static void main(String[] argv) {
int i;
for(i=0; i< doLoops().size(); i++)

System.out.println((doLoops().get(i)));

}
}
I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]

Please help me,,
 
O

Oliver Wong

mai said:
Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:
Click to expand...

[code snipped]
I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]
Click to expand...

What results did you expect (this isn't a sarcastic or rhetorical
question -- I really don't know what it is you're trying to do)? Perhaps you
meant to override the toString() method? See
http://www.javapractices.com/Topic55.cjp

- Oliver
 
R

RedGrittyBrick

mai said:
Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:

package loop;
import java.util.ArrayList;
import java.util.List;

public class Loop{
public int level;
public int counter1;
public int counter2;
public int counter3;

public Loop(int level,int c1, int c2, int c3){
this.level=level;
counter1 = c1;
counter2 = c2;
counter3 = c3;
}
public static List<Loop> doLoops() {
Click to expand...

public static void main(String[] argv) {
int i;
for(i=0; i< doLoops().size(); i++)

System.out.println((doLoops().get(i)));
Click to expand...

That returns a reference to the i'th Loop object in the List returned by
doLoops(). If you print a reference you'll get the sort of output you
show below. Maybe you should write a toString() method for your Loop
object and then

System.out.println( doLoops().get(i).toString() );
I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]
Click to expand...
 
M

mai

I was trying to print the values of the list. Which are ,supposesdly,
integer values,
Oliver said:
mai said:
Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:
Click to expand...

[code snipped]
I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]
Click to expand...

What results did you expect (this isn't a sarcastic or rhetorical
question -- I really don't know what it is you're trying to do)? Perhaps you
meant to override the toString() method? See
http://www.javapractices.com/Topic55.cjp

- Oliver
Click to expand...
 
M

mai

Hi,, Thanks for your help,, but I still get the same results even after
writing:
System.out.println(doLoops().get(i).toString());

Please help,,
mai said:
I was trying to print the values of the list. Which are ,supposesdly,
integer values,
Oliver said:
mai said:
Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:
Click to expand...

[code snipped]
I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]
Click to expand...

What results did you expect (this isn't a sarcastic or rhetorical
question -- I really don't know what it is you're trying to do)? Perhaps you
meant to override the toString() method? See
http://www.javapractices.com/Topic55.cjp

- Oliver
Click to expand...
Click to expand...
 
P

Patricia Shanahan

mai said:
Hi,, Thanks for your help,, but I still get the same results even after
writing:
System.out.println(doLoops().get(i).toString());

Please help,,
mai said:
I was trying to print the values of the list. Which are ,supposesdly,
integer values,
Oliver said:
Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:
[code snipped]

I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]
What results did you expect (this isn't a sarcastic or rhetorical
question -- I really don't know what it is you're trying to do)? Perhaps you
meant to override the toString() method? See
http://www.javapractices.com/Topic55.cjp

- Oliver
Click to expand...
Click to expand...
Click to expand...

Please don't add your material at the top - its better to keep things in
order.

You are still calling the Loop object toString method, without having
supplied a toString override in the Loop class. Loop's immediate
superclass is Object, so you are using the Object toString method.

You need to add to Loop a method:

public String toString(){
// build the string you want to describe your loop object.
// return it.
}

Patricia
 
M

mai

Patricia said:
mai said:
Hi,, Thanks for your help,, but I still get the same results even after
writing:
System.out.println(doLoops().get(i).toString());

Please help,,
mai said:
I was trying to print the values of the list. Which are ,supposesdly,
integer values,
Oliver Wong wrote:
Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:
[code snipped]

I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]
What results did you expect (this isn't a sarcastic or rhetorical
question -- I really don't know what it is you're trying to do)? Perhaps you
meant to override the toString() method? See
http://www.javapractices.com/Topic55.cjp

- Oliver
Click to expand...
Click to expand...

Please don't add your material at the top - its better to keep things in
order.

You are still calling the Loop object toString method, without having
supplied a toString override in the Loop class. Loop's immediate
superclass is Object, so you are using the Object toString method.

You need to add to Loop a method:

public String toString(){
// build the string you want to describe your loop object.
// return it.
}

Patricia
Click to expand...

Thanx for your message,, but shouldn't doLoops().get(i) return the
element of the index i in the list,, that's what i understood from the
java doc,, and I don't know how to build the string in the toString
method :s ,, can u help me further more,, Thanx once again
 
P

Patricia Shanahan

mai said:
Patricia said:
mai said:
Hi,, Thanks for your help,, but I still get the same results even after
writing:
System.out.println(doLoops().get(i).toString());

Please help,,
mai wrote:
I was trying to print the values of the list. Which are ,supposesdly,
integer values,
Oliver Wong wrote:
Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:
[code snipped]

I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]
What results did you expect (this isn't a sarcastic or rhetorical
question -- I really don't know what it is you're trying to do)? Perhaps you
meant to override the toString() method? See
http://www.javapractices.com/Topic55.cjp

- Oliver
Click to expand...
Please don't add your material at the top - its better to keep things in
order.

You are still calling the Loop object toString method, without having
supplied a toString override in the Loop class. Loop's immediate
superclass is Object, so you are using the Object toString method.

You need to add to Loop a method:

public String toString(){
// build the string you want to describe your loop object.
// return it.
}

Patricia
Click to expand...

Thanx for your message,, but shouldn't doLoops().get(i) return the
element of the index i in the list,, that's what i understood from the
java doc,, and I don't know how to build the string in the toString
method :s ,, can u help me further more,, Thanx once again
Click to expand...

Are you following a course, tutorial, or book? This exercise, in its
current form, should not appear until after you know a little string
manipulation and have seen some toString examples.

An alternative way is to forget about printing Loop objects directly,
and instead print the fields, for example doLoops().get(i).level.

Patricia
 
D

Daniel Pitts

mai said:
Patricia said:
mai said:
Hi,, Thanks for your help,, but I still get the same results even after
writing:
System.out.println(doLoops().get(i).toString());

Please help,,
mai wrote:
I was trying to print the values of the list. Which are ,supposesdly,
integer values,
Oliver Wong wrote:
Hi,,
I'm learning Java,, and I was trying to creat a function that performs
a three-level nested loop and returns a list of loop objects indicating
progress through the loop,,but when I ran this code:
[code snipped]

I got the following results,,

[loop.Loop@10b62c9, loop.Loop@82ba41, loop.Loop@923e30,
loop.Loop@130c19b, loop.Loop@1f6a7b9, loop.Loop@7d772e,
loop.Loop@11b86e7, loop.Loop@35ce36, loop.Loop@757aef,
loop.Loop@d9f9c3, loop.Loop@9cab16, loop.Loop@1a46e30,
loop.Loop@3e25a5, loop.Loop@19821f, loop.Loop@addbf1, loop.Loop@42e816,
loop.Loop@9304b1, loop.Loop@190d11, loop.Loop@a90653, loop.Loop@de6ced]
What results did you expect (this isn't a sarcastic or rhetorical
question -- I really don't know what it is you're trying to do)? Perhaps you
meant to override the toString() method? See
http://www.javapractices.com/Topic55.cjp

- Oliver
Click to expand...

Please don't add your material at the top - its better to keep things in
order.

You are still calling the Loop object toString method, without having
supplied a toString override in the Loop class. Loop's immediate
superclass is Object, so you are using the Object toString method.

You need to add to Loop a method:

public String toString(){
// build the string you want to describe your loop object.
// return it.
}

Patricia
Click to expand...

Thanx for your message,, but shouldn't doLoops().get(i) return the
element of the index i in the list,, that's what i understood from the
java doc,, and I don't know how to build the string in the toString
method :s ,, can u help me further more,, Thanx once again
Click to expand...

doLoops().get(i) will return the element at index i. the element at
index I is a "Loop" object, not an integer.

List<Loop> doLoops; // This declares a list of loops.

List<Integer> integers; // This is a list of Integer objects.
 
O

Oliver Wong

mai said:
Patricia said:
public String toString(){
// build the string you want to describe your loop object.
// return it.
}
Click to expand...
[...]
I don't know how to build the string in the toString
method :s ,, can u help me further more,, Thanx once again
Click to expand...

Add the following method to your Loop object:

public String toString(){
return "Hello world!";
}

and run your program again, and observe the results. That should give you a
hint as to how to implement your toString() method.

- Oliver
 

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