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### 类变量、成员变量和局部变量
Java中共有三种变量，分别是类变量、成员变量和局部变量。他们分别存放在JVM的方法区、堆内存和栈内存中。
     * @author Hollis
    public class Variables {
        /**
         * 类变量
        private static int a;
        /**
         * 成员变量
        private int b;
        /**
         * 局部变量
         * @param c
        public void test(int c){
            int d;
上面定义的三个变量中，变量a就是类变量，变量b就是成员变量，而变量c和d是局部变量。

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