静态变量实例化有关问题呀_J2SE

静态变量实例化问题呀
class Single {
private Single() {}

private static Single instance = new Single();

/* private static Single instance;
instance = new Single()
*/
我用注释里的来实例化，编译为什么会出错，说是需要标识符

------解决方案--------------------

Java code

public class Single {    private Single() {}    private static Single instance = new Single();    private static Single instance(){        instance = new Single();        return instance;    }}
------解决方案--------------------
Java codeclass Single {  private Single() {}  // private static Single instance = new Single(); //假如注释掉  private static Single instance; //这句话没有问题  // instance = new Single(); //这句活有问题，因为这条语句不能直接放在这里，必须放在某个方法里面或者放在初始化块里面。