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修饰符 class 类名
{
CODE
}

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　　abstract boolean break byte case
　　catch char class continue default
　　do double else extends false
　　final finally float for if
　　implements import instanceof int interface
　　long native new null package
　　private protected public return short
　　static super switch synchronized this
　　throw throws transient true try
　　void volatile while

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class TestScope
{
    public static void main(String [] args)
    {
        int x=5;
        {
            int q=12;
            System.out.println(x);
            System.out.println(q);
        }
        System.out.println(x);
        //System.out.println(q);//q不可见

    }
}

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{

int x=0;
        {
        int x=1;
        x++;
        }
x++;
}

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class Testvar
{
    public static void main(String [] args)
    {
        int x=0;//初始化
        x=x+1;
        System.out.println(x);
    }
}

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. [] ()
++ -- ! ~
* / %
+ -
<< >> >>>
< > <= >=
== !=
&
^
&&
||
?:
=

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