Use Getters / Setters Only When They Are Needed?

Should we always use getters/setters, e.g. even in something like

Java Code:

class Foo {
private static int foo;
public int getFoo() {
return foo;
}
public void setFoo(int fig) {
foo = fig;
}
} mh_sh_highlight_all('java');

Or should we use the only when there is a good reason to use them, e.g. validation for a setter or may be computing a value to return from some variables etc. ?