Related to For loop in java

[Sonal Kumar]

Please see the below code in java . I'm not able to understand it .Please explain clearly with the output ..

class JMM112 {
public static void main (String[] args) {
int j = 0;
for (int i = 0; i++ < 2;) do
System.out.print(i);
while (j++ < 2);
}
}

I'm waiting for the reply . Please respond quickly ...

[JosAH]

Please see the below code in java . I'm not able to understand it .Please explain clearly with the output ..

class JMM112 {
public static void main (String[] args) {
int j = 0;
for (int i = 0; i++ < 2;) do
System.out.print(i);
while (j++ < 2);
}
}

I'm waiting for the reply . Please respond quickly ...

Greetings, you should've asked this question in the Java Forum; they're able to
help you overthere. Here's a tip: change that print statement to:

System.out.println("i: "+i+" j: "+j);
 

... and run your program; you'll see what's happening exactly.

kind regards,

Jos

[Ganon11]

Thread has been moved to the Java forum.

[Nepomuk]

class JMM112 {
  public static void main (String[] args) {
    int j = 0;
    for (int i = 0; i++ < 2;) do
      System.out.print(i);
     while (j++ < 2);
 }
}
 

Hello Sonal Kumar! Welcome to TSDN!

OK, let's go through it line after line.

Line 1: class JMM112 {
With this line you do two things:

1. You define a class named "JMM112"
2. You open the declaration of that class (with the bracelet)

Line 2: public static void main (String[] args) {[/i]
This line defines a function/method (void) named main. This method will be accessible for any other class (public) and without creating an object from the class (static). Also, this method has parameters: an Array (which is a type of Collection) of Strings (which are any string of characters, e.g. "Hello").
Then you open the declaration of the method (with the bracelet).
The main method has a very special meaning: It is the method, which is called, when ever you start your program. (The main method - sound's reasonable, doesn't it?) Anything, that your program should do, has to be called (directly or indirectly) in this method.

Line 3: int j = 0;
This Line defines and declares a new variable called j with the type integer and the value 0. The semicolon closes this command.

Line 4: for (int i = 0; i++ < 2;) do
This line is a bit complicated, as it does several things.

1. You start a so called for-loop.This loop defines a variable i of the type integer and with the value 0. The loop should run, as long as i < 2 is valid and every time it finishes a run, it should increment i (= add 1 to it). This is stated in the expression i++ which is, for the moment, identical to i = i + 1; or ++i. Then comes a semicolon and an empty expression (there could be something behind the semicolon and before the bracet).
   The normal way to declare this loop would be
   

   for (int i = 0; i < 2; i++)
    

   however both declarations do the same.
2. You start a so called do-while-loop. This loop will do something, then check, if the condition under which it should do so is still fulfilled and if so will repeat that.

Line 5: System.out.println(i);
For the first time in this short program, you call a function. System.out.println will print something to the console (e.g. commandline or console). In this case, it will print the current value of the variable i.

Line 6: while (j++ < 2);
This is the second half of the do-while-loop. It checks, if j < 2 and if so repeats whatever came after do, after it has incremented the variable j.

After this line, the brackets, which were opened previously are closed again. Every bracket, which you open within your program MUST be closed at some point.

OK, if you have more questions or have problems understanding something, just ask again! :-)

Greetings,
Nepomuk

[r035198x]

Hello Sonal Kumar! Welcome to TSDN!

OK, let's go through it line after line.

Line 1: class JMM112 {
With this line you do two things:

1. You define a class named "JMM112"
2. You open the declaration of that class (with the bracelet)

Line 2: public static void main (String[] args) {[/i]
This line defines a function/method (void) named main. This method will be accessible for any other class (public) and without creating an object from the class (static). Also, this method has parameters: an Array (which is a type of Collection) of Strings (which are any string of characters, e.g. "Hello").
Then you open the declaration of the method (with the bracelet).
The main method has a very special meaning: It is the method, which is called, when ever you start your program. (The main method - sound's reasonable, doesn't it?) Anything, that your program should do, has to be called (directly or indirectly) in this method.

Line 3: int j = 0;
This Line defines and declares a new variable called j with the type integer and the value 0. The semicolon closes this command.

Line 4: for (int i = 0; i++ < 2;) do
This line is a bit complicated, as it does several things.

1. You start a so called for-loop.This loop defines a variable i of the type integer and with the value 0. The loop should run, as long as i < 2 is valid and every time it finishes a run, it should increment i (= add 1 to it). This is stated in the expression i++ which is, for the moment, identical to i = i + 1; or ++i. Then comes a semicolon and an empty expression (there could be something behind the semicolon and before the bracet).
   
   
   
   The normal way to declare this loop would be
   
   
   
   

    
    
    
   for (int i = 0; i < 2; i++)
    
    
    
    

   however both declarations do the same.
2. You start a so called do-while-loop. This loop will do something, then check, if the condition under which it should do so is still fulfilled and if so will repeat that.

Line 5: System.out.println(i);
For the first time in this short program, you call a function. System.out.println will print something to the console (e.g. commandline or console). In this case, it will print the current value of the variable i.

Line 6: while (j++ < 2);
This is the second half of the do-while-loop. It checks, if j < 2 and if so repeats whatever came after do, after it has incremented the variable j.

After this line, the brackets, which were opened previously are closed again. Every bracket, which you open within your program MUST be closed at some point.

OK, if you have more questions or have problems understanding something, just ask again! :-)

Greetings,
Nepomuk

Perhaps you should have given them a bit more time to try and work it out themselves.

[Nepomuk]

Perhaps you should have given them a bit more time to try and work it out themselves.

Well, maybe. On the other hand, I did give a very detailed description of what it does and therefore I hope, that it will be really understood.

[JosAH]

Well, maybe. On the other hand, I did give a very detailed description of what it does and therefore I hope, that it will be really understood.

I consider 'very detailed' an understatement; you used a tunneling microscope
and disected every single bit to tiny pieces where even those quarcks can't
see the little pieces anymore.

kind regards,

Jos (<--- chocolate and vanilla, I don't want the strawberries ;-)

[Nepomuk]

I consider 'very detailed' an understatement; you used a tunneling microscope
and disected every single bit to tiny pieces where even those quarcks can't
see the little pieces anymore.

kind regards,

Jos (<--- chocolate and vanilla, I don't want the strawberries ;-)

In that case, I'll just say: "It's art! :-D