Addition outside method inside class

Question

This below operation providing errors while i'm adding outside of the method,

the below mentioned code declared as instance variable,and i performed addition inside the class and outside the method,

int a=10; a=a+10;

if i add this inside method then there will be no compilation errors,why??

If your question is why you cannot simply start writing instructions anywhere in the java class the answer is simple: because java wasn't designed that way and it doesn't make sense. When would you expect those lines of code to be executed and in what order? — user6073886
– user6073886, Commented Sep 8, 2020 at 10:34
In a class body you can only have: member definitions and initializer blocks. The only place to put statements is within method and constructor bodies and initializer blocks. a = a+10 is a statement. — RealSkeptic
– RealSkeptic, Commented Sep 8, 2020 at 10:38

VaibS · Accepted Answer · 2020-09-08 10:43:42Z

In Java, methods have the responsibility to perform operations on the instance variables. If an instance variable needs to be initialized, you can use constructor or initializer block. You can do as below:

 int a = 0; { a = a + 1; }

Java-Dev · Accepted Answer · 2020-09-08 11:40:42Z

In Java int a=10; a=a+10; is not possible. but you can try this, may be helpful for you.

public class AddOutsideMethod { private static int i = 10; private static int j = i + 10; public static void main(String[] args) { System.out.println(j); } }

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