package和import

package com.bjsxt.java140;

class Cat {
}

package com.bjsxt.java139;

import com.bjsxt.java140.*;

public class Dog {
    public static void main(String[] args) {
        Cat c = new Cat();
    }
}

cat.class在 java\testpackage\com\bjsxt\java140

dog.class在java\testpackage\

如果dog.class在java路径下，则需要添加classpath=\java\testpackage\