error: '.class' expected in the following Java code

Question

Here in the following code I am trying to print the difference of two arrays but I am getting this class error: '.class' expected

Its coming on here

  ArrayCopy9526.java:15: error: '.class' expected
       int[] buffer = new int[array1];

And below is my full code.

public class ArrayCopy9526 {
   public static void main(String[] args){
      int[] sourceArr = {0,1,23,4,45,5,667,7,764,8,23};
      int[] arrayAno = {2,3,34,45,456,56,13,123,8,23};


      arrayDiff(sourceArr, arrayAno);

   }
  public static void arrayDiff(int[] arrayOne, int[] arrayTwo){
     int array1 = arrayOne.length;
     int array2 = arrayTwo.length;

      if(array1 < array2)   
       int[] buffer = new int[array1];
     else
       int[] buffer = new int[array2];

       for(int i = 0; i < array1; i++ ){
         for(int j= 0; j < array2; j++) {
           if(arrayOne[i] != arrayTwo[j]){
            buffer[i] = arrayOne[i];
           }
         }             
       }

    for(int i :buffer){
        System.out.println(i);
    }
  } 
}

What's wrong with this code?

Does it say on what line it's expecting the .class?

AntonH
– AntonH

2014-04-09 17:31:58 +00:00
Commented Apr 9, 2014 at 17:31 — AntonH
– AntonH, Commented Apr 9, 2014 at 17:31
provide us with diagnostics

nimsson
– nimsson

2014-04-09 17:32:07 +00:00
Commented Apr 9, 2014 at 17:32 — nimsson
– nimsson, Commented Apr 9, 2014 at 17:32
I have upated the question @AntonH. Thanks

John Doe
– John Doe

2014-04-09 17:35:22 +00:00
Commented Apr 9, 2014 at 17:35 — John Doe
– John Doe, Commented Apr 9, 2014 at 17:35

rgettman · Accepted Answer · 2014-04-09 17:32:42Z

5

For the bodies of your if and else, you must have a statement or a block, not a declaration. The ".class expected" message is confusing, but it comes on the declaration. "Not a statement" might have been a clearer message.

Declare your buffer before your if and assign it in your if and else.

int[] buffer;
if(array1 < array2)
   buffer = new int[array1];
else
   buffer = new int[array2];

answered Apr 9, 2014 at 17:32

rgettman

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3 Comments

John Doe Over a year ago

Thanks Dude its first time I cam across this.

John Doe Over a year ago

Why Declaration is not considered a statement?

rgettman Over a year ago

As the body of an if or else, it's useless. It goes out of scope immediately.

Bathsheba · Accepted Answer · 2014-04-09 17:39:01Z

1

buffer goes out of scope at the end of the if statement.

Declare buffer before the if or use a ternary operator:

int[] buffer = new int[array1 < array2 ? array1 : array2];

edited Apr 9, 2014 at 17:39

answered Apr 9, 2014 at 17:33

Bathsheba

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3 Comments

John Doe Over a year ago

Nice way to do initialisation. Thanks

Bathsheba Over a year ago

It does allow initialisation but the scoping rules of if statements override that. This all leads to better program stability.

John Doe Over a year ago

So because a block specifies the scope in Java the buffer is going out of scope after the if block and is not available for the rest of code.

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