Java Question

[tipsy]

What I want is to print values in array index 10, 20,30,40 ...  likewise  using for loop.

 

class coolExample
{
public static void main(String[] args)
{
int anArray[];
int j;
anArray= new int[10];
anArray[0]=10;
anArray[1]=20;
anArray[2]=30;
anArray[3]=40;
anArray[4]=50;
anArray[5]=60;
anArray[6]=70;
anArray[7]=80;
anArray[8]=90;
anArray[9]=100;

for(j=0;j<anArray.length;j++)
{

System.out.println(anArray);
}
}
}

 

Output I'm getting from running this is : 0,1,2,3,4....9

 

 

and  I tried this

for(j=0;j<anArray.length;j++)
{
anArray[j]=j;
System.out.println(anArray[j]);

 

Same result.

[Bowly]

anArray.forEach(System.out.println());

 

i think its something like this.

lemme know if it doesn't work. 

 

btw this is java8 im using

 

Edit: i just remembered it would be like this: anArray.forEach(System::println); or anArray.forEach(a -> System.out.println(a)); i think both are correct

[Bowly]

for(j=0;j<anArray.length;j++)

{

 

System.out.println(anArray);

}

}

}

 

Output I'm getting from running this is : 0,1,2,3,4....9

 

 

and  I tried this

for(j=0;j<anArray.length;j++)

{

anArray[j]=j;

System.out.println(anArray[j]);

 

Same result.

 In your first loop you're not printing the values and in your second you're overwriting the value thats inside your array you must leave out anArray[j]=j and it should work

[tipsy]

 for(j=0;j<anArray.length;j++)
{
System.out.println(anArray[j]);
}
}
}

 

this worked thanks.

[JoNny]

Try this

 

 

anArray...
j...

for(j = 0; i < anArray.length; j++) {
    System.out.println(anArray[j]);
}

 

/JoNny

[Bowly]

i recommand working with java8 tho instead of java7. its much easier to use and its alot less code to write.

[Pepperonipizza]

There is a bunch of stuff you could be doing more elegantly/efficiently. I re-wrote your program the way I would write it:

     public static void main(String []args){
        int anArray[] = new int[10];
        
        // Construct array
        for (int i = 0; i<10; i++) {
            anArray[i] = 10*i;
        }
        
        // Print array
        for (int el : anArray) {
            System.out.println(el);
        }
     }

Pay special attention to the for (int el : anArray) line. This is Java's "smart for-loops" feature that is very useful. El will iterate over all values in anArray, regardless of what type of a container that anArray is. I usually program in C++ and this feature is invaluable there (since iterators can be pretty indirect to work with at times when you don't really need them).

[JoNny]

There is a bunch of stuff you could be doing more elegantly/efficiently. I re-wrote your program the way I would write it:

     public static void main(String []args){
        int anArray[] = new int[10];
        
        // Construct array
        for (int i = 0; i<10; i++) {
            anArray[i] = 10*i;
        }
        
        // Print array
        for (int el : anArray) {
            System.out.println(el);
        }
     }

Pay special attention to the for (int el : anArray) line. This is Java's "smart for-loops" feature that is very useful. El will iterate over all values in anArray, regardless of what type of a container that anArray is. I usually program in C++ and this feature is invaluable there (since iterators can be pretty indirect to work with at times when you don't really need them).

 

 

And even that is no good.

This takes way too much of load time. Two for / -each loops is still one too much.

 

As you know what you will insert (otherwise you wouldn't use an array), you can directly insert the values upon variable initalization.

Like so:

public static void main(String[] args){
     int anArray[] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
        
     // Print array
     for (int el : anArray) {
       System.out.println(el);
     }
 }

/JoNny

[Pepperonipizza]

 As you know what you will insert (otherwise you wouldn't use an array), you can directly insert the values upon variable initalization.

 

True.

 

However, if there are such strict performance concerns, Java isn't the language one should be looking at. You will need something more along the lines of C++ in such a case.

[parrot]

        .data
myArr: .space 40
        .text
la $t0, myArr
li $t1, 20
sw $t1, 4($t0)
li $t1, 30
sw $t1, 8($t0)
li $t1, 40
sw $t1, 12($t0)
li $t1, 50
sw $t1, 16($t0)
li $t1, 60
sw $t1, 20($t0)
li $t1, 70
sw $t1, 24($t0)
li $t1, 80
sw $t1, 28($t0)
li $t1, 90
sw $t1, 32($t0)
li $t1, 100
sw $t1, 36($t0)
li $t1, 10
sw $t1, ($t0)
li $t2, 1
li $v0, 1
j condition
 
loop:
 
sll $t4, $t2, 2
add $t3, $t0, $t4
lw $a0, ($t3)
syscall
addi $a0, $0, 0xA
addi $v0, $0, 0xB
syscall
addi $v0, $0, 1
addi $t2, 1
 
condition:
bne $t1, $t2, loop
 
li $v0, 10
syscall

My assembly is a bit rusty, but I think that works

[Jefke]

public static void main(String[] args)

{

 Arrays.stream(new int[] { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 }).forEach(System.out::println);

}

//Going to far with it 

public static void main(String[] args)

{

 Stream.of(10, 20, 30, 40, 50, 60, 70, 80, 90, 100).forEach(System.out::println);

}

public static void main(String[] args)

{


     int anArray[] = { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 };


     System.out.println(Arrays.toString(anArray));

}

public static void main(String[] args)

{

   System.out.println(Arrays.toString((new int[] { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 })));

}

/* Now I'm going to stop, I went over board with it 

* Also doesn't follow the task anyway */

 

Edited February 17, 2016 by DrJoske