java - Why do I need to `{...}` to filling an array in the class scope? -


what's wrong below program?

package test;  public class test {      byte[] array = new byte[2];     array[0] = 'a';     array[1] = 'b'; }

look,the ide indicate problems(click enlarge) :

enter image description here

in other word, why should move filler lines inner scope follow :

package test;  public class test {      byte[] array = new byte[2];     {         array[0] = 'a';         array[1] = 'b';     } }

the ide doesn't have problem above program.

in snippet try assignments (to array: e.g. array[0] = 'a') outside method

public class test {     byte[] array = new byte[2];     array[0] = 'a';     array[1] = 'b'; }

whereas in snippet assignments inside instance initializer block

public class test {     byte[] array = new byte[2];     {         array[0] = 'a';         array[1] = 'b';     } }

if want in code example in init method

public class test {     byte[] array = new byte[2];      void initarray() {         array[0] = 'a';         array[1] = 'b';     } }

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