Below program shows all types of variables and explains their scopes too. Please refer to the comments to understand which

are __in scope__ and which are __out of scope__.

{% highlight java linenos %}

class Scope {

static int s = 343; // static variable

int x; // instance variable

{ // initialization block

x = 7;

int x2 = 5; // block variable

}

Scope() { // constructor

x += 8;

int x3 = 6;

}

void doStuff() { // method

int y = 0; // local variable

for (int z = 0; z < 4; z++) { // 'for' code block

y += z + x;

}

z++; // compiler error (out of scope)

x2++; // compiler error (out of scope)

}

public static void main(String[] a) {

x++; // compiler error! 'x' is instance variable, so

// we need an object to access it

x2++; x3++; // compiler error! block variables scope

// is only inside the block in which they

// are declared

}

}

{% endhighlight %}