简单的Java“新”概念问题

编译器显示错误new Stock[2]; after ;{ expect.

public class TestStockUI {
    Stock[] stock = new Stock[2];
    stock[0] = new Stock("Microsoft", "MSFT", 15.69);
    stock[1] = new Stock("Google", "GOGL", 323.98);

    public TestStockUI() { }

}

然后我将其更改如下，导致相同的错误。

public class TestStockUI {
    Stock[] stock = new Stock[2];
    stock[0] = new Stock("Microsoft", "MSFT", 15.69);
    stock[1] = new Stock("Google", "GOGL", 323.98);

}

这解决了问题，但我不知道为什么。

public class TestStockUI {
    Stock[] stock = new Stock[2];
    {
        stock[0]=new Stock("Microsoft","MSFT",15.69);
        stock[1]=new Stock("Google","GOGL",323.98);
    }

}

{
    stock[0]=new Stock("Microsoft","MSFT",15.69);
    stock[1]=new Stock("Google","GOGL",323.98);
}

这创建了一个初始化块 http://download.oracle.com/javase/tutorial/java/javaOO/initial.html，其中这些陈述是合法的。它们在前两个示例中是不合法的。