question

[Soum Sark]

Why does
System.out.print("1")
compile when in a {} and not when outside. What purpose does the {} serve ?
class Q {
{
System.out.print("1");
}
static {
System.out.print("2");
}
Q() {
System.out.print("3");
}
}

[Valentin Crettaz]

{} denotes an instance initialization block. Please refer to JLS 8.6 Instance Initializers for detailed information.