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Java的Package中同名类的冲突
同一Package中不能存在同名类。
即使Package中不同的java文件下也不可有同名类，因为各个java文件编译后的class文件生成在Package目录下，会发生冲突。
运行java带包package的class文件
针对于带包的class文件
package test.demo;
1.编译class文件
CMD窗口中在class文件的根目录src\test\demo下执行
javac Test.java
2.执行class文件
则在package的根目录src下执行
java test.demo.Test
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